Question about 1991 Mercury Capri

1 Answer

1991 Mercury Capri does not have power to fuel pump

Battery was installed backwards. The car was not started like this. Battery was changed as soon as it was realized, under a minute. Found that an 80 amp fuse had been blown, replaced that. Now there is no power to fuel pump. Located what is thought to be inertia switch in trunk area, no power to it either. When turning key, engine turns, but will not start. what next?

Posted by on

  • 1 more comment 
  • Heather Guthrie Dec 28, 2008

    What exactly is the ECU? We have replaced the main computer unit, and it did exactly the same thing as with the original. There are several "boxes" with this car. It is the Austrailian made model, and has turbo. There are alot of Mitsubishi parts on this car. We have alot of extra parts, because we bought one that had been rolled. This seems to be the same problem that we had over the summer. It seems like it should start, it just wont. At that time we replaced the starter and alternator. Neither seemed to make a difference. It just all of a sudden decided it would start, so we figured that there had been a bad connection somewhere.It kept doing fine until a little over a week ago when I went to leave and the battery was dead, new battery was installed backwards, and that was all she wrote. We had a Ford mechanic look at the car last night, and he does not know what the problem is. We are at a loss.

  • Anonymous Mar 16, 2014

    1991 merc capri inertia switch location

  • Anonymous Mar 16, 2014

    1991 merc capri fuel pump inertia switch location



1 Answer

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

Power for the fuel system comes from the ECU. I would start by trying to read the fault codes. If you can not get the reader to communicate with the ECU, I would replace the ECU. Warning: it is expensive. I get mine from wrecking yards.

Posted on Dec 27, 2008


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer


HHMMMM no idea without my head under the bonnet sorry hood ,could be the injectors are gummed up as you state you have a good pressure and it runs on a dope spray .Other than that i dont know what else offhand to suggest ,take the injectors out and try blowing them backwards with a air line it might work

Dec 20, 2013 | 1991 Mercury Capri

1 Answer

I hoked the battery up backwards in my 1991 mercury capri. I replaced the 80amp fuse under the hood and now the fuel pump does not engage. There are 2 plugs going int the pump. One plug has 3 wires, 1 is...

The dim wire is probably the reference voltage to the level sensor. There should also be a wire for the sensor return signal. Did you change the wiring? Relay seems to be working...

Jul 20, 2017 | Cars & Trucks

1 Answer

The battery was hooked up backwards in my 1991 mercury capri non turbo. I replaced the 80amp main fuse under the hood. It doesn't sound like the fuel pump is working. The cut off switch in the trunk...

Find the fuel pump relay and see if it still has a power feed. I hope you didn't hurt the computer with battery on backwards, but that is a possibility.
Pull the fuel pump relay, and check all the terminals it plugs into with a test light or voltmeter. One terminal should have power. It should be hot at all times. If nothing trace the power supply from battery to that relay. A fuse or fusible link may have gone out. If it does have power, check at the fuel tank for power on the pump wire when the engine is cranking. If power there, likely the pump is gone. If no power signal when cranking the engine, it's back to the relay to check the fuel pump circuit. You will have to see a wiring diagram.

Aug 15, 2013 | Cars & Trucks

1 Answer

91 mercury capri will not idle

Clean the idle speed control valve and the throttle body of the engine and that should correct this.

May 27, 2012 | 1991 Mercury Capri

1 Answer

1991 mercury cpri starts then shuts off after 30-45 secs. does not sputter, goes off just like turning the key to the off position. Recently changed the gas tank sending unit, 600 miles ago.

Possibly the fuel pump input line was pinched when the sender was replaced...the pump and sender are connected and both must be removed from the gas tank to replace either...a new filter screen should have been installed when the pump was removed, an old screen that was repositioned could be the culprit...good luck...Chris

Aug 24, 2011 | 1991 Mercury Capri

1 Answer

Battery was installed backwards, car was not started in this condition. Battery was corrected. Car will not start now. It rolls over when switch is turned, but is not getting any power to fuel pump. Does...

try cleaning off battery terminals and connecting leads with small wire brush. red is positive, black is negative. also make sure that connections to fuel pump are not loose. good luck!

Dec 21, 2008 | 1991 Mercury Capri

2 Answers

New Battery Installation (Problems)

I would remove the battery and give it a good charge. New batterys require a low amp over night charge. A cars altenator isn't designed to charge a battery it's made to maintain the battery to it's fullest ability. The headlights opening and closing would indicate to me a low voltage, causing the relays for the headlights not to fully shut or open. Let me know if this solves your issue, if not we can trouble shoot farther. Thank you for using

Sep 29, 2008 | 1991 Mercury Capri

Not finding what you are looking for?
1991 Mercury Capri Logo

Related Topics:

441 people viewed this question

Ask a Question

Usually answered in minutes!

Top Mercury Experts

gerry bissi

Level 3 Expert

4387 Answers


Level 3 Expert

83096 Answers


Level 3 Expert

5690 Answers

Are you a Mercury Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides