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?
Re: 1991 Mercury Capri does not have power to fuel pump
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.
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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
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.
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
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 fixya.com