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1995 Chevy Pick up 5.7 fuel pump won't shut off
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tnted
New User
Mar 29, 2011, 6:13 PM
Post #1 of 14
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1995 Chevy Pick up 5.7 fuel pump won't shut off
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I have a 1995 Chevy pick up 5.7 engine. The fuel pump never shuts off. With the ignition switch the fuel pump continues to run until it runs the battery down. I can pull the FP relay and it still runs.
Any suggestions.
Thanks
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Hammer Time
Ultimate Carjunky
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Mar 29, 2011, 6:16 PM
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Re: 1995 Chevy Pick up 5.7 fuel pump won't shut off
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Unplug the oil pressure switch and see if it stops.
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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.
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tnted
New User
Mar 29, 2011, 6:39 PM
Post #3 of 14
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Re: 1995 Chevy Pick up 5.7 fuel pump won't shut off
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I unplugged the oil pressure switch and it stopped. This was a new switch that was just put on.
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Hammer Time
Ultimate Carjunky
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Mar 29, 2011, 6:42 PM
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Re: 1995 Chevy Pick up 5.7 fuel pump won't shut off
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High quality parts. Leave it off until you get another one.
Make sure there's nothing shorted in the plug.
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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 Mar 29, 2011, 6:43 PM)
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tnted
New User
Mar 29, 2011, 6:44 PM
Post #5 of 14
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Re: 1995 Chevy Pick up 5.7 fuel pump won't shut off
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Thanks Hammer Time
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Mr.scotty
Enthusiast
Apr 10, 2011, 10:28 PM
Post #6 of 14
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Re: 1995 Chevy Pick up 5.7 fuel pump won't shut off
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Wow.., very interesting.
how does the oil pressure switch work with the fuel pump?
Thanks,
Scotty
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Your only as good as your tools!
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Tom Greenleaf
Ultimate Carjunky
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Apr 11, 2011, 3:26 AM
Post #7 of 14
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Re: 1995 Chevy Pick up 5.7 fuel pump won't shut off
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Inredible Hammer - that was a great find/fix.
Mr. Scotty: There has to be a system in vehicles with electric fuel pumps shut them OFF like if in an accident the last thing anyone needs is a fuel pump staying on dumping fuel over a hot engine. Oil pressure, inertia switches are used for that purpose,
T
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Hammer Time
Ultimate Carjunky
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Apr 11, 2011, 5:23 AM
Post #8 of 14
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Re: 1995 Chevy Pick up 5.7 fuel pump won't shut off
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No, the oil pressure switch does not shut off the fuel pump.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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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Tom Greenleaf
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Apr 11, 2011, 6:15 AM
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Re: 1995 Chevy Pick up 5.7 fuel pump won't shut off
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I thought that was one way to detect engine running and enable fuel pump. Prehistoric now but the early Chevy Vega did use an electric pump that would shut down via oil pressure signal. Perhaps other things too? Hey that was so long ago and now don't know if one exists - was a road call and for the life of me don't know how I figured that one out?
Tom
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Mr.scotty
Enthusiast
Apr 11, 2011, 3:06 PM
Post #10 of 14
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Re: 1995 Chevy Pick up 5.7 fuel pump won't shut off
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That makes sense to me!
Thanks
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Your only as good as your tools!
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Hammer Time
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Apr 11, 2011, 3:32 PM
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Re: 1995 Chevy Pick up 5.7 fuel pump won't shut off
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That might make sense to you but that is not the way it works. It is a redundant power supply to the fuel pump. You can remove either the fuel pump relay or unplug the oil pressure switch when the engine is running and neither will cause the engine to stall provided the other is working.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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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Tom Greenleaf
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Apr 11, 2011, 3:49 PM
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Re: 1995 Chevy Pick up 5.7 fuel pump won't shut off
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OK: All ears (eyesight is shot up close anyway)
For ions Fords were using an inertial switch. Owner's manuals said how to reset them. One hard pot hole could shut off fuel pump. Defaults seemed to be off, not stuck on?
I have to believe that something shuts down an electric fuel pump in case of a collision, battery good, engine may still be running with cracked fuel lines spraying fuel all over the wrong places if just hit wrong. Wouldn't be pretty!
T
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Hammer Time
Ultimate Carjunky
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Apr 11, 2011, 3:58 PM
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Re: 1995 Chevy Pick up 5.7 fuel pump won't shut off
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You can believe what you want but GM does not interrupt the fuel pump circuit for oil pressure.
The fuel pump doesn't run anyways unless it sees a tach signal.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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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Tom Greenleaf
Ultimate Carjunky
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Apr 11, 2011, 4:45 PM
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Re: 1995 Chevy Pick up 5.7 fuel pump won't shut off
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I knew no tach signal would shut down GM fuel pumps and should. Just wondered if there's was another something just in the rare case an engine was still running but car wrecked. Gotta be 99.99 % of hard hits that engine would at least stall out so we don't or st least I don't hear of too many disasters of the sort,
T
(This post was edited by Tom Greenleaf on Apr 11, 2011, 4:46 PM)
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