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09-27-2012, 12:01 AM
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#1 |
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Registered User
Join Date: Sep 2012
Location: Yucca valley CA
Posts: 5
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1990 V3500 TBI problems
Just picked up a really clean 1990 v3500 4X4 with 454, th400, np205, 14 bolt, Dana 60. Was running great. Got it home, crawled underneath and wires were scattered all over going to the gas tanks. I got the schematic of the factory wiring, removed all the rat nest and re wired all. I now have a good selector valve and good pressure to the TBI, but no vroom vroom. I teased it with gas down the intake and it started. Had a friend try and start it and I observed no fuel coming from the injectors. I replaced the filter and rebuilt the TBI with new screens and o rings. Still no fuel. I jumped the injectors with a battery and they click. I have power at the injector connector with the key on, but no ground. Can someone please help me???
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09-27-2012, 09:42 AM
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#2 |
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Registered User
Join Date: May 2012
Location: Colo Springs, CO
Posts: 870
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Re: 1990 V3500 TBI problems
Just a guess but how is the spray on the injectors? Is it worth installing some new ones?
__________________
- Jeff 89' K5 Blazer, 2.5" lift, 35" tires  04' GMC Yukon XL, 3/4 ton, 8.1L |
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09-27-2012, 12:13 PM
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#3 | |
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Registered User
Join Date: Sep 2012
Location: Yucca valley CA
Posts: 5
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Re: 1990 V3500 TBI problems
Quote:
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09-27-2012, 12:19 PM
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#4 |
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Slots go on anything!
Join Date: May 2003
Location: Richardson, TX
Posts: 5,957
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Re: 1990 V3500 TBI problems
Sounds like maybe the fuel pump relay, or bad pump.
__________________
1974 Jimmy- 5.3/4L80e/NP241 |
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09-27-2012, 12:41 PM
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#5 |
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Registered User
Join Date: Sep 2012
Location: Yucca valley CA
Posts: 5
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Re: 1990 V3500 TBI problems
There is no pump relay on dual tank trucks and I have good pressure up to the TBI.
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09-27-2012, 12:46 PM
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#6 |
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Slots go on anything!
Join Date: May 2003
Location: Richardson, TX
Posts: 5,957
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Re: 1990 V3500 TBI problems
Seems like there is an injector fuse also. You may have inadvertantly shorted that out when you repaired the wiring. I don't think it is a big fuse- maybe a 5 amp if that. Mine is converted, so I still have the '74 fusebox. Just going off of memory.
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1974 Jimmy- 5.3/4L80e/NP241 |
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09-27-2012, 01:07 PM
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#7 |
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Registered User
Join Date: Sep 2012
Location: Yucca valley CA
Posts: 5
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Re: 1990 V3500 TBI problems
Crank fuse, yes it's good and has power to and through...
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09-27-2012, 02:54 PM
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#8 |
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Slots go on anything!
Join Date: May 2003
Location: Richardson, TX
Posts: 5,957
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Re: 1990 V3500 TBI problems
You might gheck them all. I found wiring diagrams on the AutoZone website, it looks like there is an ECM A & ECM B fuse that might be culprit. I could have sworn there is an INJ fuse as well.
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1974 Jimmy- 5.3/4L80e/NP241 |
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09-27-2012, 11:02 PM
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#9 |
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Registered User
Join Date: Sep 2012
Location: Yucca valley CA
Posts: 5
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Re: 1990 V3500 TBI problems
Ugh....
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