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elk killer
Novice
Jun 6, 2009, 3:16 PM
Post #1 of 11
(2270 views)
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has new fuel pump,,has new fuel relay,,have checked all fuses and all grounds,,
the fuel pump wont come on in the on position,,only works in the start position,,
no fuel gets to the throttle body,,if i pour gas in the throttle body it runs fine,,
it ran very well,,then all of a sudden wont start,,has plenty of spark,,
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 6, 2009, 4:05 PM
Post #2 of 11
(2264 views)
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Re: 1991 gmc pickup
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Your fuel pump is not supposed to be on in the "on" position if the truck isn't running. It only comes on for 2 seconds and comes back on when the computer sees a tach signal.
You need to check your fuel pressure and determine if it's within spec or not.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on Jun 6, 2009, 4:05 PM)
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elk killer
Novice
Jun 6, 2009, 4:12 PM
Post #3 of 11
(2258 views)
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Re: 1991 gmc pickup
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i have to have,,fuel pressure to check it...???
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 6, 2009, 4:14 PM
Post #4 of 11
(2255 views)
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Re: 1991 gmc pickup
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You said the fuel pump ran during cranking.
Is it getting the 2 second "key on" pulse?
Have you put a gauge on it to find out?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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elk killer
Novice
Jun 6, 2009, 4:42 PM
Post #5 of 11
(2248 views)
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Re: 1991 gmc pickup
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you can hear it come during cranking,,
but it pumps nothing to the throttle body
i get no 2 second anything
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 6, 2009, 4:45 PM
Post #6 of 11
(2245 views)
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Re: 1991 gmc pickup
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How do you know that without a fuel pressure gauge?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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elk killer
Novice
Jun 6, 2009, 4:58 PM
Post #7 of 11
(2240 views)
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Re: 1991 gmc pickup
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because i took the gas line off at the fuel filter,,and there is nuthing there during cranking
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 6, 2009, 5:01 PM
Post #8 of 11
(2237 views)
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Re: 1991 gmc pickup
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If you hear the fuel pump running and nothing is coming out of the line, then you need to drop the tank and likely change the fuel pump although you could find a bad rubber connector hose on the pump itself blowing the fuel right back into the tank.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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elk killer
Novice
Jun 6, 2009, 5:04 PM
Post #9 of 11
(2233 views)
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Re: 1991 gmc pickup
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i know it means nuthing,,but a month and a half ago,,i put a new fuel pump in it,,and it ran fine
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 6, 2009, 5:11 PM
Post #10 of 11
(2229 views)
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Re: 1991 gmc pickup
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That's right, it means nothing at all or it could be the installation that's the actual problem. The bottom line is if you know the pump is running and there is nothing at the fuel filter, then the tank has to come down.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Asilus
User
Jun 9, 2009, 7:35 PM
Post #11 of 11
(2212 views)
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Re: 1991 gmc pickup
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When you turn the key to the start position without cranking the fuel pump primes the lines, such as hammer time suggested the 2 second run time. Double check then ignition system, plugs... definitely replace fuel filter, might be part of the problem.
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