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Author Topic: 1987 v10 fuel issues  (Read 3641 times)

Offline gutts

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1987 v10 fuel issues
« on: April 16, 2016, 05:55:00 pm »
Hello All !
I have a problem I cannot figure out . Perhaps I am missing something ? Long story short :
Key on =power to fuel Solenoid (I tested it it is good)
= no power going to tank switch
I have run the truck momentarily with jumpers to the wires that go back to the rear of vehicle. Both pumps work . The truck has undergone a engine transplant. This has been a year long process. Through out the process there seamed to be an intermittent issue with this . With all the fuel wires, switch , solenoid , oil pressure switch , intact , I've got nothing .
I know where the feed wires exit the firewall and go to the tanks .
Where do the wires that go to the fuel switch come from ? I believe they come from the solenoid??
Where to look ? Are there any common problem areas ?
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Offline VileZambonie

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Re: 1987 v10 fuel issues
« Reply #1 on: April 16, 2016, 06:33:34 pm »
If you jump B+ to the test terminal at the fuel pump relay does it run on either tank?

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Offline gutts

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Re: 1987 v10 fuel issues
« Reply #2 on: April 16, 2016, 07:28:55 pm »
If I power up the solenoid,  I get power to the tan /white wire . So have power going out . I have taken the switch out (temporarily) . With a test light , I tested the wires going into the back of the switch . I have nothing there ...?
  I have been working on this problem for a long time . I am stymied . I am thinking that the wire (tan/white) is broken between these points . Does it go straight from the solenoid to the switch ?
  Thank you for your response!!
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Offline gutts

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Re: 1987 v10 fuel issues
« Reply #3 on: April 16, 2016, 07:32:22 pm »
What I mean by power up is , I get power "going out " of the tan wire .
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Offline VileZambonie

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Re: 1987 v10 fuel issues
« Reply #4 on: April 16, 2016, 07:48:02 pm »
What solenoid are you talking about? If you want help diagnosing your problem, you need to have everything connected correctly and nothing bypassed or unhooked
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline gutts

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Re: 1987 v10 fuel issues
« Reply #5 on: April 16, 2016, 08:01:06 pm »
Sorry , my terminology is wrong . When I used the word "solenoid" I was referring to the fuel relay.
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Offline VileZambonie

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Re: 1987 v10 fuel issues
« Reply #6 on: April 17, 2016, 09:55:02 am »
Okay so with everything hooked up, if you run a B+ to the pigtail at the fuel pump relay, does it work in either tank position and or do you hear either fuel pump running?
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline gutts

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Re: 1987 v10 fuel issues
« Reply #7 on: April 19, 2016, 03:25:16 pm »
Hello Mr Vile
  Thank you for backing me up and telling me to start over . I went back through it again , and I found that , that switch was um kind of intermittent. I do believe that that was the problem . I only get a bit of time here and there to work on it . I will post again if I run into another problem
  THANKS
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Offline Irish_Alley

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Re: 1987 v10 fuel issues
« Reply #8 on: April 20, 2016, 10:23:45 am »
the switches do get a gummed up and will work like you described. think theyre $15 at the parts stores
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