My fuel pump stays on after I turn the car off what could be the problem?

10

Asked by Dec 06, 2010 at 05:05 PM about the 1988 Dodge Daytona

Question type: Maintenance & Repair

12 Answers

1,845

Is the key still in the ignition? If no, do any other accessories still work (IE: radio, turn signals, etc)? If yes, then I would check the ignition switch to see if it's shorting out & remaining "on", otherwise, check the fuel pump relay & make sure it's not stuck closed (you should only get continuity across one set of contacts on the relay - if you have continuity across both, then its stuck closed). If your relay turns out to be good, check to see if the relay's power circuit is energized with the car off. If so, the problem is either a short in the relay control circuit, or a bad ECU. If the relay's power circuit is not energized, then you're just going to have to start following the wire back from the pump to the relay, checking every so often to find out where power is shorting into the circuit.

5 out of 5 people think this is helpful.
25

This is an EXTREMELY dangerous situation, especially if you were to have an accident. Good suggestions have been made here, please do not ignore this problem.

1 out of 1 people think this is helpful.
1,845

There should still be an inertia-based cutoff switch, which I believe is located very near the pump itself, which is designed to cut power to the fuel pump in the case of an accident. That being said, I would still take care of the problem as soon as logistically possible.

10

Thanks guys for the replies, It happens when i turn the car off with no accessories on it doesn't have any patterns it just happens some days and then other days I'm always hearing it on when i turn the car off I can get the pump to shut off by just turning the key but not starting it, it always shuts off but its just a concern because before I had to rely on taking off the negative cable so it wouldn't kill my battery, could this fuel pump problem be a cause of why my car is sputtering? Thanks once again for the replies

1 out of 1 people think this is helpful.
1,845

It really sounds to me like you've got an intermittant short in the control circuit of the fuel pump relay. That would be the first place I'd look. On a side note, it might be easier to just remove the fuel pump relay when you stop the car instead of removing the negative terminal each time, as I'm sure you're probably doing a bit of damage to the terminal if you're fully retightening it, and leaving it loose isn't adviseable either, as it will affect a good many electrical systems in your car, as well as running the risk of damage from electrical arcing.

1 out of 1 people think this is helpful.
10

I have the negative cable connected completely now, where exactly would the relay be located? could it be a bad relay because some people have told me that the relay could be bad and if i replace it the problem would be fixed but I have noticed when the negative cable isnt tight my car seems to loose power. Its just an odd problem that I havent ever experienced an any of the other cars I've owned and the most recent problem that is happening is my revs sometimes will only go to 3000 rpms and at most 4500 and the car acts like its a rev limiter, I ve looked up on forums what it could be and I read it could be something with the HEP or map sensor, Im just at a lose with the Daytona it just seems like problem after problem, is this a common thing with these cars? Thanks again for the help!

95

The relay is located in a black rectangle box on drivers side underneath the hood it will have several relays in it along with fuses I'd replace the relay it only costs about 10 dollors at your local parts store.

2 out of 2 people think this is helpful.
10

ACTUALLY I AM HAVING THIS VERY SAME PROBLEM,I HAVE A 1992 CROWN VICTORIA AND I TOOK IT TO BE SMOGED AND WHEN I GOT HOME AND TURNED MY CAR OFF THE FUEL PUMP WAS STILL RUNNING AND DRAINED MY BATTERY. SO NOW I HAVE TO GO TO MY TRUNK WHERE THE INTERTIA BUTTON IS AND WHEN I WANT TO DRIVE I PRESS IT AND WHEN IM DONE DRIVING I HAVE TO SMACK IT TO MAKE IT POP UP TO SHUT IT OFF... WHAT CAUSED THIS TO HAPPEN AND SHOULD I JUST GET A NEW FUEL PUMP? AND RELAY? OR BOTH? OR HELP...

1 out of 1 people think this is helpful.

every electric motor in a car has a relay and a relay is nothing but a switch to turn the fuel pump motor off and on. Inside the relay has a set of points that opens and closes and what happens is the points get carbon on the surface and they stick together. that's when you smack it then it opens the points and shuts off the fuel pump.

40

If I take my relay switch out and the pump is still on what can it be? the key is turned off out no ass on it only goes off when I take the + battery cable off but my truck has a problem ideling and staying on please help me?!??

4 out of 4 people think this is helpful.
10

i have problem too. when i turn on ignition switch, a fuel always keep on without off. what is my problem?? please help me.

10

a normal car should switch on then after few sec, it switch off. what the problem i have now. what should i do? any answer for auto parts? sorry for my bad english. i still learning. bruneian

1 out of 1 people think this is helpful.

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