silly fuel pump circuit wiring problem making me mad

8

86gtriceeater

Member

Aug 4, 2006

316

0

17

Whitewater, WI

Sep 12, 2009

#1

• Sep 12, 2009

• #1

Car started and ran fine, got to my gf's house. Went to leave and once again fuel pump wont prime. I get 12v at inertia switch (not tripped) eec power relay turns on and i get 12v at the yellow wire, tan green and the red black on the fuel pump relay! So i swapped the eec power relay with that one and it does the same thing, so i ruled out the relay itself. I also tried jumping the fuel pump using the diagnostic connector but got nothing.....wont prime, where to go from here? How do i check the fusible links under the hood, there are a lot of them and i dont know which ones do what....

 

liljoe07

5 Year Member

Feb 18, 2009

1,622

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124

Cartersville,Ga

Sep 12, 2009

#2

• Sep 12, 2009

• #2

Just use a Volt Meter or test light, and test both side of the Fuse link. Should be one of the yellow ones.

 

86turbo

Member

Apr 8, 2006

183

0

17

Sep 12, 2009

#3

• Sep 12, 2009

• #3

I don't know the history of your vehicle so here is what I think based on the info you've given.

I would say that the eec isn't grounding the fuel pump relay. I forget which color the wire is (ground on control side of relay) but you should check and make sure it has zero resistance to ground when the key is primed. If it does NOT then I would bet money that the power to your eec is not there. Did you short anything out? Check the fusible links up front and I bet you'll find your culprit.

If it's blown then just cut it off and replace it with a low amp blade style fuse holder...

good luck

Drew

 

8

86gtriceeater

Member

Aug 4, 2006

316

0

17

Whitewater, WI

Sep 12, 2009

#4

• Sep 12, 2009

• #4

all fuse links check out okay w 12v at all of em. The only wire i dont have power at is the pink/black at the fp relay. All relays click on...Im not sure what wires to check at the eec power relay...

 

liljoe07

5 Year Member

Feb 18, 2009

1,622

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124

Cartersville,Ga

Sep 12, 2009

#5

• Sep 12, 2009

• #5

The Pink/ black wire should have voltage when the relay engages. The Pink/Black wire feeds the pump
Go back and ground the Fuel pump manually at the Test Connector, then see if you have power at the Pink/Black wire

 

8

86gtriceeater

Member

Aug 4, 2006

316

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17

Whitewater, WI

Sep 12, 2009

#6

• Sep 12, 2009

• #6

by jumping it to ground under the hood?

 

8

86gtriceeater

Member

Aug 4, 2006

316

0

17

Whitewater, WI

Sep 12, 2009

#7

• Sep 12, 2009

• #7

good suggestion i jumped it and it now has power, but what does that mean? i also have 12v all the way back to the pump but no prime, so what now? Oh and the yellow at the fuel pump only has well toggles between 5.4 and zero v So what now? Thank you sooo much

 

liljoe07

5 Year Member

Feb 18, 2009

1,622

363

124

Cartersville,Ga

Sep 12, 2009

#8

• Sep 12, 2009

• #8

Yellow at the fuel pump??????? Sure thats not the sending unit wire?

Anyways, sounds like the pump is shot, or maybe a bad connection in or on top of the tank

 

8

86gtriceeater

Member

Aug 4, 2006

316

0

17

Whitewater, WI

Sep 12, 2009

#9

• Sep 12, 2009

• #9

sure was! Bad connection dropping the tank now! You made my day, SERIOUSLY! Thank you soooo very much I have tires to burn

 

liljoe07

5 Year Member

Feb 18, 2009

1,622

363

124

Cartersville,Ga

Sep 12, 2009

#10

• Sep 12, 2009

• #10

Good Luck, and your welcome

 

8

86gtriceeater

Member

Aug 4, 2006

316

0

17

Whitewater, WI

Sep 13, 2009

#11

• Sep 13, 2009

• #11

It was the connector on top of the tank for the fuel pump-melted and broken not proving a good connection at all-thanks for you help again