Befor I changed the fuel pump If I Played with the relays and hit it with key on ,I hear a relay come on the car starts runs fine tell I turn it OFF Same thing agen,So I Changed relay,new pump now it will only start up when I put a Jump box 12 v to the new fuel pump,I did by pass the trunk s/sw?? Help
Your fuel pump also has a fuse and a injector fuse also. Could be a bad ground or crank sensor
First thing put the cutoff switch back to factory wiring this is a safety issue for a collision to shut off fuel delivery next you were hitting the relays and you could hear it cycle and the car started right so your problem is there at the relay it maybe dirty or loose fitting or its very worn inside try changing with a new one there only $5.00 & see if it works if not take out the box and check the wires underneath for corrosion and make the contacts for the relay tighter by a little bit of squeezing them it's pretty obvious that the problem is there at that relay and by the way if an accident happens and somebody dies in it be prepared for being sued after the investigation because they will find the altered fuel shut off regardless if it was cause or not forensic guys know how long it's been there NO KIDDING OK
Does the car have a fuel control module. Plz check normally would be before the wiring to the pump area
SOURCE: I have a 1992 Lincoln Mark vii lsc. Fuel pump problem!
This sounds like the PCM has taken a turn for the worst. The pcm relay sends power to the fuel relay for 2 seconds to prime the fuel system just before start up.
Then the pcm ungrouds the signal for a prove out.
SOURCE: 1999 lincoln town car, 133,000 mi. Car running
This is usually how it happens with Electric Fuel pumps. They either work or they don't. When you turn the ignition to on you should hear the pump engage and pressure up. If you don't most likely your pump is faulty. You mentioned that it did this after a freeze. It is possible that you have a frozen fuel line, Supply or return, will also cause this problem. The best you could do is move the vehicle into a garage and warm it up above freezing to allow the lines to thaw. A lot of time we get moisture build up in a tank without even knowing it. Cold fuel is supplied to the motor through the pump but the return line returns warm fuel and in a cold environment this will or can cause condensation to form in the tank and lines. Also bad fuel from a station will cause this issue. It doesn't take much with all the additives they put in fuel today. They sell fuel additive that will remove this moisture if that is the problem. try warming the vehicle up and thawing the lines. If this proves to be the issue you'll need to drop and drain the tank and lines to clear the problem or try a fuel additive to remove the moisture.
SOURCE: I have replaced my fuel
Have to look at a wiring diagram to figure that out
At least I would.
Does the relay energize in your hand,
with batt & grd on coil & ohm meter on
it's contacts, to see if their burnt?
e.g. do you need 12 + volt for it to work
Your looking for a voltage drop ---maybe
Don't rule out the ignition switch it gets a lot of use
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