Question about 1987 Jaguar XJ6

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Replace fuel pump

Fuel pump will work when I apply power directly to it. not working from battery. fuses look ok- is there a switch in car for fuel pump?

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  • Jaguar Master
  • 3,679 Answers

Could be the relay follow this link might be of help
Fuel Pump issue Jaguar Forums Jaguar Enthusiasts Forum

Posted on Mar 27, 2014

3 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

dealt_soul
  • 296 Answers

SOURCE: no power to fuel pump

If you tested the pump with another equal voltage source then the pump is bad and needs replacement

Posted on Jan 19, 2009

  • 3600 Answers

SOURCE: no power to fuel pump and or relay

It's best to buy the subscription to your car here www.alldatdiy.com and read the information on that car, I only have down to 93 and don't know if they are the same. hope this helps.

Posted on Aug 31, 2009

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Dodge 1500 1995 pickup 7.5 volts to fuel pumpwill not start applied 12 volts pump runs book sayes pcm de-energize booth relayes and will not send proper voltage to fuel pump


There is a red and white wire feeding the fuel pump relay from a 30 amp fuse. Both the shutdown relay and the fuel pump relay are grounded by the PCM, so if the fuel pump relay is grounded it should be "on" and providing a direct link from the pump to that fuse.
You should have battery voltage on that 30 amp wire before the relay and then on the dark green and black wire going to the pump.
If you don't have battery voltage coming from the 30 amp fuse, the problem could be before the fuse.
That 30 amp fuse is hot all the time, so it is powered by a fuseable link coming off the battery.

Jun 24, 2012 | Cars & Trucks

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No power to fuel pump on a 1993 ford probe. all fuses are god,fuel pump relay is good and fuel cut of switch is good as well but still no power to pump?


If you actually have no power to the pump and all the fuses and relays are good check the wires for a short and if that is good replace the ignition switch. If you think the condition is no power to the pump because it doesn't seem to power up remove the pump and apply direct power to it to see if the pump is the problem.

Oct 10, 2011 | 1990 Ford F150

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I have no power to the fuel pump , n when i remove the fuelpump relay n use a jumper wire i still have no power at the fuel pump on a 1988 subaru gl wagon 1.8 liter fuel injected


I would suspect that the Fuse has blown, or the wire has been cut? to that supply wire to the pump, try running a lead directly back to the Positive of the battery and see if that works OK? If so locate and replace the fuse, and or fix the broken wire.

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Starter motor went out on 92 5.0 ho replaced it and new battery, now fuel pump does not work I get a 542 code checked fuel pump relay and inertia switch both good fuse good


  • Code 542 indicates one of the following conditions:

Engine Starts:

· Fuel Pump secondary circuit shorted to power

· Fuel pump relay contacts always closed

· Open in fuel pump monitor (FPM) circuit between ECU and connection to POWER TO PUMP circuit

· Heated Exhaust Gas Oxygen (HEGO) sensor shorted to power

· faulty ECU

Engine Does Not Start:

· Open inertia switch or inertia switch circuit

· Open in or between ECU and fuel pump (This includes open in fuel pump brushes/windings)

· faulty ground connection at fuel pump

The easiest way to check this circuit is to go to the fuel pump relay. If the relay clicks when the key is turned to the "RUN" position, then the inertia switch circuit is ok.

The Pink/Black wire starts from the fuel pump relay and goes two directions. One side goes back to the fuel pump. The other side is the fuel pump monitor circuit and goes to pin #8 at the ECU. This wire should only be hot for a second or two when the ignition is turned to the RUN position.

The fuel pump relay receives power on the Black/yellow wire. It comes from a fusible link at the power distribution center. This wire should be hot at all times.

If all the above is working as designed, them you probably have a bad fuel pump.

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1 Answer

Fuel pump not operating


Your problem may be a faulty fuel pump relay.
check the fuse for the pump if is is ok.
then you need to take the fuel pump out of the tank and apply direct power to the pump with two wires and a battery if it does not run then you need a new fuel pump most likely

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Its normal for the pump to run for three seconds then shut off if the car engine is off. . This indicates that the fuel pump turned on and the pressure did reach specifications. If the pump did not reach pressure the pump would continue to run, You need to check for proper pressure with a gauge. If tthe pressure is ok then you have another issue like an ignition module or crank sensor if applicable. You may have to drive the car with the fuel gauge hooked up to see if you still have pressure when it dies.. I know you said you replaced the pump already but do you have the same issues as before you replaced it. This would indicate which direction you need to go now. If the same then its prabably not the pump.

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If pump does not work when power is directly applied, then pump will need to be replaced. Have you tested the power from the fuel pump relay?

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maybe check the fuse for the injectors...i was being stupid and did this, if that fuse is missing it wont work even if your fuel pump works fine. i think its labeled inj a+b.

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