DOC AIRBUS | TSM A320FNo Transfer or Reduced Supply (Movement) of Fuel From a Main Fuel Pump but the Related Pump P/BSW FAULT Legend (light) Does Not Come On
TASK 28-21-00-810-843-A
No Transfer or Reduced Supply (Movement) of Fuel From a Main Fuel Pump but the Related Pump P/BSW FAULT Legend (light) Does Not Come On
A. Referenced Information
3. Fault Confirmation
Subtask 28-21-00-710-090-A ** ON A/C NOT FOR ALL
Subtask 28-21-00-810-089-B ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:28:38 UTC
No Transfer or Reduced Supply (Movement) of Fuel From a Main Fuel Pump but the Related Pump P/BSW FAULT Legend (light) Does Not Come On
WARNING:
OBEY THE FUEL SAFETY PROCEDURES.
1. Possible Causes- fuel-pump canister check-valve
- fuel pump canister
- sequence valve
- main-pump-system pipe-lines
- suction valve
- CHECK VALVE [149QM]
- CHECK VALVE [151QM]
- CHECK VALVE [150QM]
- CHECK VALVE [152QM]
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| AMM 12-11-28-650-003 | Pressure Refuel with Automatic Control |
| AMM 28-00-00-000-001 | Removal of the Fuel Pipes |
| AMM 28-00-00-400-001 | Installation of the Fuel Pipes |
| AMM 28-21-00-280-001 | Check Suction Valves For Full and Free Movement |
| AMM 28-21-00-710-003 | Operational Check of Center Tank Pump Canister Check Valves |
| AMM 28-21-00-710-007 | Operational Test of the Main Fuel-Pump System with Fuel Flow by Transfer |
| AMM 28-21-00-710-012 | Operational Test of the Wing Tank Pump Canister Check Valves |
| AMM 28-21-00-720-004 | Functional Test of the Center-Tank Fuel-Pump-Cannister Check-Valves |
| AMM 28-21-00-790-001 | Leak Test of the Main Fuel-Pump-System Pipelines |
| AMM 28-21-42-000-001 | Removal of the Fuel-Pump Suction Valve |
| AMM 28-21-42-400-001 | Installation of the Fuel-Pump Suction Valve |
| AMM 28-21-45-000-001 | Removal of the Sequence Valve |
| AMM 28-21-45-400-003 | Installation of the Sequence Valve |
| AMM 28-21-51-000-001 | Removal of the Fuel Pumps |
| AMM 28-21-51-000-002 | Removal of the Fuel Pumps |
| AMM 28-21-51-400-001 | Installation of the Fuel Pumps |
| AMM 28-21-51-400-002 | Installation of the Fuel Pumps |
| AMM 28-21-52-000-001 | Removal of the Fuel Pump Canister |
| AMM 28-21-52-000-002 | Removal of the Fuel Pump Canister |
| AMM 28-21-52-000-003 | Removal of the Fuel Pump Canister |
| AMM 28-21-52-000-004 | Removal of the Check Valve of the Fuel Pump Canister |
| AMM 28-21-52-400-001 | Installation of the Fuel Pump Canister |
| AMM 28-21-52-400-002 | Installation of the Fuel Pump Canister |
| AMM 28-21-52-400-003 | Installation of the Fuel Pump Canister |
| AMM 28-21-52-400-004 | Installation of the Check Valve of the Fuel Pump Canister |
Subtask 28-21-00-710-090-A ** ON A/C NOT FOR ALL
A. Test
(1) Do the procedure for the Operational Test of the Main Fuel-Pump System with Fuel Flow by Transfer AMM 28-21-00-710-007.
1 Can be seen to change (by approximately equal amounts, the supply tank/cell FQI decreases and the receiving tank/cell FQI increases), no more trouble shooting steps are necessary.
2 Does not change when a fuel-pump is tested, do Para. 4.A. for the applicable fuel-pump(s).
(2) If, during the procedure in Para. 4.A. you have been told to do the test given in Para. 3.A. after a pump canister check valve replacement, do the procedure that follows:
Subtask 28-21-00-710-090-B ** ON A/C NOT FOR ALL (1) Do the procedure for the Operational Test of the Main Fuel-Pump System with Fuel Flow by Transfer AMM 28-21-00-710-007.
NOTE: This test is necessary because the pressure switch (that is used for monitoring the fuel pressure produced by the fuel-pump) is connected to the fuel-pump canister by a small diameter pipe-line. In the fuel-pump canister outlet to the main-pump-system pipe-lines is a check valve. If the check valve fails in the closed position it will stop, or restrict, the fuel supply from the applicable pump.
With the above fault therefore, the fuel pump low pressure (fault) system only lets you know the fuel pressure inside the fuel pump canister. This is why it is necessary to do the fuel transfer, and see the fuel flow, as it lets you know that the fuel pump canister check valve can be made to open.
(a) If, during the operational test, the fuel quantity indications (FQI) of the supply (donor) tank and the receiving tank: With the above fault therefore, the fuel pump low pressure (fault) system only lets you know the fuel pressure inside the fuel pump canister. This is why it is necessary to do the fuel transfer, and see the fuel flow, as it lets you know that the fuel pump canister check valve can be made to open.
1 Can be seen to change (by approximately equal amounts, the supply tank/cell FQI decreases and the receiving tank/cell FQI increases), no more trouble shooting steps are necessary.
2 Does not change when a fuel-pump is tested, do Para. 4.A. for the applicable fuel-pump(s).
(2) If, during the procedure in Para. 4.A. you have been told to do the test given in Para. 3.A. after a pump canister check valve replacement, do the procedure that follows:
- Operational Check of the Wing Tank Pump-Canister Check-Valves AMM 28-21-00-710-012.
NOTE: This test is necessary to make sure that the fuel pump canister check valve stays closed in the check/reverse flow direction. The fuel pump canister check valve stops the possible migration of fuel between fuel tanks and is one feature that lets you remove a fuel pump with out defuelling the applicable fuel tank.
A. Test
(1) Do the procedure for the Operational Test of the Main Fuel-Pump System with Fuel Flow by Transfer AMM 28-21-00-710-007.
1 Can be seen to change (by approximately equal amounts, the supply tank/cell FQI decreases and the receiving tank/cell FQI increases), no more trouble shooting steps are necessary.
2 Does not change when a fuel-pump is tested, do Para. 4.A. for the applicable fuel-pump(s).
(2) If, during the procedure in Para. 4.A. you have been told to do the test given in Para. 3.A. after a pump canister check valve replacement, do the applicable procedure that follows:
4. Fault Isolation(1) Do the procedure for the Operational Test of the Main Fuel-Pump System with Fuel Flow by Transfer AMM 28-21-00-710-007.
NOTE: This test is necessary because the pressure switch (that is used for monitoring the fuel pressure produced by the fuel-pump) is connected to the fuel-pump canister by a small diameter pipe-line. In the fuel-pump canister outlet to the main-pump-system pipe-lines is a check valve. If the check valve fails in the closed position it will stop, or restrict, the fuel supply from the applicable pump.
With the above fault therefore, the fuel pump low pressure (fault) system only lets you know the fuel pressure inside the fuel pump canister. This is why it is necessary to do the fuel transfer, and see the fuel flow, as it lets you know that the fuel pump canister check valve can be made to open.
(a) If, during the operational test, the fuel quantity indications (FQI) of the supply (donor) tank and the receiving tank: With the above fault therefore, the fuel pump low pressure (fault) system only lets you know the fuel pressure inside the fuel pump canister. This is why it is necessary to do the fuel transfer, and see the fuel flow, as it lets you know that the fuel pump canister check valve can be made to open.
1 Can be seen to change (by approximately equal amounts, the supply tank/cell FQI decreases and the receiving tank/cell FQI increases), no more trouble shooting steps are necessary.
2 Does not change when a fuel-pump is tested, do Para. 4.A. for the applicable fuel-pump(s).
(2) If, during the procedure in Para. 4.A. you have been told to do the test given in Para. 3.A. after a pump canister check valve replacement, do the applicable procedure that follows:
- Operational Check of the Wing Tank Pump-Canister Check-Valves AMM 28-21-00-710-012
- Operational Check of the Center Tank Pump-Canister Check-Valves AMM 28-21-00-710-003
- Functional Test of the Center Tank Pump-Canister Check-Valves AMM 28-21-00-720-004.
NOTE: The applicable test is necessary to make sure that the fuel pump canister check valve stays closed in the check/reverse flow direction. The fuel pump canister check valve stops the possible migration of fuel between fuel tanks and is one feature that lets you remove a fuel pump with out defuelling the applicable fuel tank.
Subtask 28-21-00-810-089-B ** ON A/C NOT FOR ALL
A. Procedure
(1) Remove the applicable fuel pump from the:
(a) Approximately 0.5 l (0.2 USgal) of fuel flows from the fuel pump drain, do step (3).
(b) More than approximately 0.5 l (0.2 USgal) of fuel, or fuel continues to flow from the fuel pump drain:
1 Re-install the drain plug/bolt.
2 Do step (4).
(3) Remove the check valve from the fuel pump canister AMM 28-21-52-000-004.
(a) Do a check of the check valve, to see if it can open, as follows:
1 Push the valve in (away from the valve seat). Make sure that the valve has a full and free movement.
2 If the fuel-pump canister check-valve does not have a full and free movement, replace it with a serviceable item.
(b) Install the check valve in the fuel pump canister AMM 28-21-52-400-004.
(c) Install the fuel pump in the:
(4) If the fault continues:
(a) Do the procedure for the Leak Test of the Main-Pump-System Pipe-Lines AMM 28-21-00-790-001.
Use the wing tank fuel pumps on the opposite wing to generate a fuel pressure to test the applicable engine feed pipe lines.
(b) If no leak is found, no more trouble shooting steps are necessary.
(c) If a leak is found in the center tank, do step (d). If a leak is found in the wing tank:
1 Get access to the applicable wing tank collector cell AMM 28-21-52-000-001.
2 Examine the items that follow (to see/find out what can cause the leak) for damage, incorrect assembly or installation:
a The applicable fuel pump canister .
Replace, if necessary AMM 28-21-52-000-001 / AMM 28-21-52-000-002 and AMM 28-21-52-400-001 / AMM 28-21-52-400-002.
b The related sequence valve .
Replace, if necessary, AMM 28-21-45-000-001 and AMM 28-21-45-400-003.
c The adjacent main-pump-system pipe-lines .
Replace, if necessary all the unserviceable pipe sections and connections AMM 28-00-00-000-001 and AMM 28-00-00-400-001.
d The related suction valve AMM 28-21-00-280-001.
Replace, if necessary AMM 28-21-42-000-001 and AMM 28-21-42-400-001.
3 Get access to the related wing tank inner cell AMM 28-21-52-000-001.
4 Examine the engine fuel supply pipe-line, between the Rib 2 and the exit point to the engine pylon at the forward spar, for damage, incorrect assembly or installation.
5 Replace all the unserviceable pipe sections and connections AMM 28-00-00-000-001 and AMM 28-00-00-400-001.
6 Refuel the applicable fuel tank AMM 12-11-28-650-003.
7 Do the test given in Para. 3.A.
(d) If a leak is found in the center tank:
1 Get access to the applicable side of the center tank AMM 28-21-52-000-003.
2 Examine the items that follow (to see/find out what can cause the leak) for damage, incorrect assembly or installation:
a The applicable fuel pump canister including the blanking plate installed on the unused fuel outlet.
Replace, if necessary AMM 28-21-52-000-003 and AMM 28-21-52-400-003.
b The adjacent main-pump-system pipe-lines .
Replace, if necessary all the unserviceable pipe sections and connections AMM 28-00-00-000-001 and AMM 28-00-00-400-001.
3 Refuel the center fuel tank AMM 12-11-28-650-003.
4 Do the test given in Para. 3.A.
Subtask 28-21-00-810-089-D ** ON A/C NOT FOR ALL (1) Remove the applicable fuel pump from the:
- wing tank AMM 28-21-51-000-001
- center tank AMM 28-21-51-000-002.
(a) Approximately 0.5 l (0.2 USgal) of fuel flows from the fuel pump drain, do step (3).
(b) More than approximately 0.5 l (0.2 USgal) of fuel, or fuel continues to flow from the fuel pump drain:
1 Re-install the drain plug/bolt.
2 Do step (4).
(3) Remove the check valve from the fuel pump canister AMM 28-21-52-000-004.
(a) Do a check of the check valve, to see if it can open, as follows:
1 Push the valve in (away from the valve seat). Make sure that the valve has a full and free movement.
2 If the fuel-pump canister check-valve does not have a full and free movement, replace it with a serviceable item.
(b) Install the check valve in the fuel pump canister AMM 28-21-52-400-004.
(c) Install the fuel pump in the:
- wing tank AMM 28-21-51-400-001
- center tank AMM 28-21-51-400-002.
(4) If the fault continues:
(a) Do the procedure for the Leak Test of the Main-Pump-System Pipe-Lines AMM 28-21-00-790-001.
Use the wing tank fuel pumps on the opposite wing to generate a fuel pressure to test the applicable engine feed pipe lines.
(b) If no leak is found, no more trouble shooting steps are necessary.
(c) If a leak is found in the center tank, do step (d). If a leak is found in the wing tank:
1 Get access to the applicable wing tank collector cell AMM 28-21-52-000-001.
2 Examine the items that follow (to see/find out what can cause the leak) for damage, incorrect assembly or installation:
a The applicable fuel pump canister .
Replace, if necessary AMM 28-21-52-000-001 / AMM 28-21-52-000-002 and AMM 28-21-52-400-001 / AMM 28-21-52-400-002.
b The related sequence valve .
Replace, if necessary, AMM 28-21-45-000-001 and AMM 28-21-45-400-003.
c The adjacent main-pump-system pipe-lines .
Replace, if necessary all the unserviceable pipe sections and connections AMM 28-00-00-000-001 and AMM 28-00-00-400-001.
d The related suction valve AMM 28-21-00-280-001.
Replace, if necessary AMM 28-21-42-000-001 and AMM 28-21-42-400-001.
3 Get access to the related wing tank inner cell AMM 28-21-52-000-001.
4 Examine the engine fuel supply pipe-line, between the Rib 2 and the exit point to the engine pylon at the forward spar, for damage, incorrect assembly or installation.
5 Replace all the unserviceable pipe sections and connections AMM 28-00-00-000-001 and AMM 28-00-00-400-001.
6 Refuel the applicable fuel tank AMM 12-11-28-650-003.
7 Do the test given in Para. 3.A.
(d) If a leak is found in the center tank:
1 Get access to the applicable side of the center tank AMM 28-21-52-000-003.
2 Examine the items that follow (to see/find out what can cause the leak) for damage, incorrect assembly or installation:
a The applicable fuel pump canister including the blanking plate installed on the unused fuel outlet.
Replace, if necessary AMM 28-21-52-000-003 and AMM 28-21-52-400-003.
b The adjacent main-pump-system pipe-lines .
Replace, if necessary all the unserviceable pipe sections and connections AMM 28-00-00-000-001 and AMM 28-00-00-400-001.
3 Refuel the center fuel tank AMM 12-11-28-650-003.
4 Do the test given in Para. 3.A.
A. Procedure
(1) Remove the (applicable) wing tank fuel pump AMM 28-21-51-000-001.
(2) If, during the removal of the fuel pump:
(a) Approximately 0.5 l (0.2 USgal) of fuel flows from the fuel pump drain, do step (3).
(b) More than approximately 0.5 l (0.2 USgal) of fuel, or fuel continues to flow from the fuel pump drain:
1 Re-install the drain plug/bolt.
2 Do step (4).
(3) Remove the check valve from the fuel pump canister AMM 28-21-52-000-004.
(a) Do a check of the check valve, to see if it can open, as follows:
1 Push the valve in (away from the valve seat). Make sure that the valve has a full and free movement.
2 If the fuel-pump canister check-valve does not have a full and free movement, replace it with a serviceable item.
(b) Install the check valve in the fuel pump canister AMM 28-21-52-400-004.
(c) Install the fuel-pump AMM 28-21-51-400-001.
(d) Do the test given in Para. 3.A.
(4) If the fault continues:
(a) Do the procedure for the Leak Test of the Main-Pump-System Pipe-Lines AMM 28-21-00-790-001.
Use the wing tank fuel pumps on the opposite wing to generate a fuel pressure to test the applicable engine feed pipe lines.
(b) If no leak is found, no more trouble shooting steps are necessary.
(c) If a leak is found:
1 Get access to the applicable wing tank collector cell AMM 28-21-52-000-001.
2 Examine the items that follow (to see/find out what can cause the leak) for damage, incorrect assembly or installation:
a The applicable fuel pump canister .
Replace, if necessary AMM 28-21-52-000-001 / AMM 28-21-52-000-002 and AMM 28-21-52-400-001 / AMM 28-21-52-400-002.
b The related CHECK VALVE [149QM] ( CHECK VALVE [151QM] ) and CHECK VALVE [150QM] ( CHECK VALVE [152QM] ).
Replace, if necessary, the unserviceable check valve.
c The adjacent main-pump-system pipe-lines .
Replace, if necessary all the unserviceable pipe sections and connections AMM 28-00-00-000-001 and AMM 28-00-00-400-001.
d The related suction valve AMM 28-21-00-280-001.
Replace, if necessary AMM 28-21-42-000-001 and AMM 28-21-42-400-001.
3 Get access to the related wing tank AMM 28-21-52-000-001.
4 Examine the engine fuel supply pipe-line, between the Rib 2 and the exit point to the engine pylon at the forward spar, for damage, incorrect assembly or installation.
5 Replace all the unserviceable pipe sections and connections AMM 28-00-00-000-001 and AMM 28-00-00-400-001.
6 Refuel the applicable fuel tank AMM 12-11-28-650-003.
7 Do the test given in Para. 3.A.
(1) Remove the (applicable) wing tank fuel pump AMM 28-21-51-000-001.
(2) If, during the removal of the fuel pump:
(a) Approximately 0.5 l (0.2 USgal) of fuel flows from the fuel pump drain, do step (3).
(b) More than approximately 0.5 l (0.2 USgal) of fuel, or fuel continues to flow from the fuel pump drain:
1 Re-install the drain plug/bolt.
2 Do step (4).
(3) Remove the check valve from the fuel pump canister AMM 28-21-52-000-004.
(a) Do a check of the check valve, to see if it can open, as follows:
1 Push the valve in (away from the valve seat). Make sure that the valve has a full and free movement.
2 If the fuel-pump canister check-valve does not have a full and free movement, replace it with a serviceable item.
(b) Install the check valve in the fuel pump canister AMM 28-21-52-400-004.
(c) Install the fuel-pump AMM 28-21-51-400-001.
(d) Do the test given in Para. 3.A.
(4) If the fault continues:
(a) Do the procedure for the Leak Test of the Main-Pump-System Pipe-Lines AMM 28-21-00-790-001.
Use the wing tank fuel pumps on the opposite wing to generate a fuel pressure to test the applicable engine feed pipe lines.
(b) If no leak is found, no more trouble shooting steps are necessary.
(c) If a leak is found:
1 Get access to the applicable wing tank collector cell AMM 28-21-52-000-001.
2 Examine the items that follow (to see/find out what can cause the leak) for damage, incorrect assembly or installation:
a The applicable fuel pump canister .
Replace, if necessary AMM 28-21-52-000-001 / AMM 28-21-52-000-002 and AMM 28-21-52-400-001 / AMM 28-21-52-400-002.
b The related CHECK VALVE [149QM] ( CHECK VALVE [151QM] ) and CHECK VALVE [150QM] ( CHECK VALVE [152QM] ).
Replace, if necessary, the unserviceable check valve.
c The adjacent main-pump-system pipe-lines .
Replace, if necessary all the unserviceable pipe sections and connections AMM 28-00-00-000-001 and AMM 28-00-00-400-001.
d The related suction valve AMM 28-21-00-280-001.
Replace, if necessary AMM 28-21-42-000-001 and AMM 28-21-42-400-001.
3 Get access to the related wing tank AMM 28-21-52-000-001.
4 Examine the engine fuel supply pipe-line, between the Rib 2 and the exit point to the engine pylon at the forward spar, for damage, incorrect assembly or installation.
5 Replace all the unserviceable pipe sections and connections AMM 28-00-00-000-001 and AMM 28-00-00-400-001.
6 Refuel the applicable fuel tank AMM 12-11-28-650-003.
7 Do the test given in Para. 3.A.