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12-17-2011, 01:35 PM
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#1 |
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horsepower junkie
Join Date: Oct 2004
Location: Podunk,TX
Posts: 153
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Fuel problems,,
Had a question a couple months ago on a 94 V6, 4.3 half ton not running fuel pump when cold. Had some time today to mess with it and found that if I put fire to the gray wire leaving relay it runs pump. Fire going into relay but not energizing the pump. It is a new relay and pump. As long as it above 45-50 degrees it all works fine. Drove it just the other day, no problems. Today its currently 38 and no run. What should be telling the relay to work, and which wire should that be?? Thanks, and sorry so long!
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12-17-2011, 01:51 PM
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#2 |
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Senior Member
Join Date: Jul 2006
Location: Blountville, Tn.
Posts: 3,904
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Re: Fuel problems,,
have you checked to make sure you are getting the signal from the wiring harness to power on the relay? In my experience I've taken "brand new" relays out of the box for them only to be bad. get another one since they"re cheap enough.
__________________
*We could learn a lot from crayons... Some are sharp; some are pretty;and some are dull. Some have weird names; and all are different colours;but they all have to live in the same box. * You may be only one person in the world, But you may also be the world to one person. * Some mistakes are too much fun to only make once. Two rules in life. 1. Never sweat the small stuff! 2. Everything is small stuff! |
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12-17-2011, 02:27 PM
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#3 |
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Registered User
Join Date: May 2004
Location: Minnesota
Posts: 4,621
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Re: Fuel problems,,
__________________
For those of you that are wondering why you are not getting replies to your thread: Did you give the model, year, engine, fuel system type, and transmission information? If it is modified from what came stock from the factory, let us know that too. |
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12-17-2011, 03:28 PM
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#4 |
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horsepower junkie
Join Date: Oct 2004
Location: Podunk,TX
Posts: 153
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Re: Fuel problems,,
Ok Barry, was sorta my question to ck to see if I was getting signal.Not sure what to ck. And just for an fyi, I took the old relay apart and plugged it in it cycled the pump, but wouldn't start it. I took and cked for voltage getting across it but couldn't find anything. Took and moved contacts together, pump ran, and it started right up. Did so a couple more times without me moving contacts. Going to print off info that chevytech linked and go thru that. Any help GREATLY apreciated!!
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12-17-2011, 03:51 PM
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#5 |
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horsepower junkie
Join Date: Oct 2004
Location: Podunk,TX
Posts: 153
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Re: Fuel problems,,
Ok, just cked obd, and have 54,59,66,67,73,82. The 54 I probally did myself, not sure but would bet I have had key on and pulled the relay off. The rest I do not know.Thanks!
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12-17-2011, 04:05 PM
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#6 |
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Registered User
Join Date: May 2004
Location: Minnesota
Posts: 4,621
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Re: Fuel problems,,
Clear the trouble codes and see if it sets a code 54 when you have not unplugged any wiring.
The power wire to the relay is Orange and comes from a fusible link that gets power from the junction block on the firewall by the relay. The relay ground wire is black with a white stripe. 1994 has a gray wire to the fuel pump. The control wire from the computer is Dark Green with a white stripe. It should have power for at least two seconds when you first turn the key to the on position. Go take a look at this thread too. http://67-72chevytrucks.com/vboard/s...d.php?t=495054
__________________
For those of you that are wondering why you are not getting replies to your thread: Did you give the model, year, engine, fuel system type, and transmission information? If it is modified from what came stock from the factory, let us know that too. |
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12-17-2011, 07:46 PM
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#7 |
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horsepower junkie
Join Date: Oct 2004
Location: Podunk,TX
Posts: 153
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Re: Fuel problems,,
Ok, kept starting good, course the day had warmed up also.So will try it again in the morning while it is in the 30's again.Thanks!
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12-22-2011, 11:30 PM
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#8 |
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horsepower junkie
Join Date: Oct 2004
Location: Podunk,TX
Posts: 153
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Re: Fuel problems,,
Ok,just wanted to say Thanks!!! As of today, and after all the piddiling being done it has now started everyday, even in the 20-30 degree weather!! So thanks again!
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12-23-2011, 04:14 PM
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#9 |
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Registered User
Join Date: May 2004
Location: Minnesota
Posts: 4,621
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Re: Fuel problems,,
Your're welcome!
Glad to hear it is working well.
__________________
For those of you that are wondering why you are not getting replies to your thread: Did you give the model, year, engine, fuel system type, and transmission information? If it is modified from what came stock from the factory, let us know that too. |
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