Electrical No fuel pump prime or start

AnthonyA1234

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#1

• Sep 5, 2024

• #1

I took my car to get painted and it ran great. Now I got it back and the fuel pump is not working… Any tips on how I can trouble shoot my way to finding the problem? I did a wire tuck so the pump relay and all those wires are all pretty hard to get to now. However I took the front bumper off and reached inside the fender where I hid the relay and I feel and hear it clicking. What else can I check?

Inertia switch is also good

 

AnthonyA1234

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#2

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• #2

It’s a 1992 btw

 

89ripper

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#3

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And what about power to the pump. Did it have voltage? Also did you have the relay under the hood initally? Supposed to be under the seat for some of the years

 

AnthonyA1234

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#4

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• #4

No I haven’t, how exactly do I check that? Where do I connect my multi meter probes?

Yes it was under the hood originally

 

89ripper

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#5

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And this is all stock wiring correct? I mean before the wire tuck

 

89ripper

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#6

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• #6

Rather than repeat some things, check this out

Fuel - Fuel pump won’t prime

So I’m having a hard time on a 88 mustang I have that gives all the wires but one power on the fuel pump relay(pink/black). I’ve checked my grounds on the eec and they’re on tight but I am assuming it’s not completing the circuit by not grounding it it just sends power to everything but not the...

stangnet.com

Should be a good place to start

 

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AnthonyA1234

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#7

• Sep 5, 2024

• #7

89ripper said:

And this is all stock wiring correct? I mean before the wire tuck

Click to expand...

Yes sir

 

89ripper

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#8

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Ok keep us informed if you found out the problem yet

 

AnthonyA1234

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#9

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• #9

I hope it’s not anything relay related because then I have to take the fender off… I’m gonna read that thread when I get home and try it out . I’ll let you know thanks

 

89ripper

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#10

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• #10

Ironically that would an easy fix, normally. Good luck.

 

AeroCoupe

lube between the nut and the face. I know my lubes

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#11

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There is a connector behind the rear bumper and just above the fuel tank. You can separate that and check for voltage to the pump. If you have it there then you will need to drop the tank.

 

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AnthonyA1234

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#12

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• #12

I attempted jumping the test port but im not sure if im doing it right. All I had was some extra wire so I stuck it in the port and touched it to multiple ground locations with the key on and nothing happened. Am I doing something wrong or is that just the result of the test?

 

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AnthonyA1234

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#13

• Sep 5, 2024

• #13

AeroCoupe said:

There is a connector behind the rear bumper and just above the fuel tank. You can separate that and check for voltage to the pump. If you have it there then you will need to drop the tank.

Click to expand...

Are you referring to this plug here?

 

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AeroCoupe

lube between the nut and the face. I know my lubes

Founding Member

Oct 28, 2001

5,835

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Claremore, OK

Sep 5, 2024

#14

• Sep 5, 2024

• #14

Behind the bumper cover, under the car and just above the fuel tank. This one:



Which you can see in the very upper center of this picture:

 

Last edited: Sep 18, 2024

AnthonyA1234

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#15

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• #15

Found it, does anyone know which ports I hook up my multimeter to?

 

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89ripper

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#16

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• #16

Check the black/pink wire

 

AnthonyA1234

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#17

• Sep 5, 2024

• #17

89ripper said:

Check the black/pink wire

Click to expand...

What do I touch the other probe of the multimeter to? Just any ground?

 

89ripper

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#18

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• #18

Yes ground it.

 

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AeroCoupe

lube between the nut and the face. I know my lubes

Founding Member

Oct 28, 2001

5,835

3,966

183

Claremore, OK

Sep 6, 2024

#19

• Sep 6, 2024

• #19

If you have power there then the issue is most likely the fuel pump but it could be the connection on top of the fuel pump hanger.

 

AnthonyA1234

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Sep 6, 2024

#20

• Sep 6, 2024

• #20

So good news I have power at that fuel pump connection you told me to check. Should I just order a new fuel pump and filter and knock that out or are there any more tests I should do to check if it’s anything else