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#2
11-20-2006, 05:36 PM
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Re: Fuel Pump will not engage.
Quote:
fuel pump relay
__________________
Why do you never have enough time or money to do the job right the first time, but enough time and money to do it again? Got all the certifications 25 years ASE Certified Master Technician GM WCT Yea..I work at a DEALERSHIP....got a problem with that? Want to diagnose cars like the Pros? FOR SALE: OTC Perception 2 channel Labscope (badged as a Matco Reality) This is my personal labscope that I use to diagnose waveforms, like new, comes with leads and training video PM Me for details 
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#4
11-20-2006, 09:40 PM
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Re: Fuel Pump will not engage.
Quote:
__________________
Why do you never have enough time or money to do the job right the first time, but enough time and money to do it again? Got all the certifications 25 years ASE Certified Master Technician GM WCT Yea..I work at a DEALERSHIP....got a problem with that? Want to diagnose cars like the Pros? FOR SALE: OTC Perception 2 channel Labscope (badged as a Matco Reality) This is my personal labscope that I use to diagnose waveforms, like new, comes with leads and training video PM Me for details
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#5
11-21-2006, 10:44 AM
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Re: Fuel Pump will not engage.
Quote:
The connector outside the fuel tank is known to corrode or burn and fail to electrically connect. The wires on the fuel pump inside the tank also have had problems and some new pumps come with a new pump pigtail wire, or a note to replace the pigtail. There is a little wire with a connector thet hangs out of the harness just behind the fuse box on the fender in front of the brake master cylinder. It is where you can jumper 12 volts and cause the pump to go. it bypasses everything and goes directly to the pump. If the pump doesn't run with the wire jumped to 12 volts, then there is a bad wiring from there to the pump, or a bad pump. Good luck, Bob B
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#6
11-21-2006, 03:00 PM
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Re: Fuel Pump will not engage.
Tested the wiring this morning and it showed the pump getting 12V. So we went and got yet another new fuel pump....got it home hooked it all up and it worked for maybe 5 seconds....and then it was dead again.
Anymore suggestion
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#7
11-21-2006, 03:43 PM
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Re: Fuel Pump will not engage.
Update:
Took the fuel pump out of tank and tried it...and it works. Put the pump back in tank and it won't. Anyone have any suggestions as to what to look at that would be causing this?
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#8
11-22-2006, 08:48 AM
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Re: Fuel Pump will not engage.
Quote:
Did you perform a voltdrop test? did you check grounds? Check the connector at the sender (where the FP and Sender harness connects to the underside of the sender assembly)..is the connector burnt? Are the terminals tight?
__________________
Why do you never have enough time or money to do the job right the first time, but enough time and money to do it again? Got all the certifications 25 years ASE Certified Master Technician GM WCT Yea..I work at a DEALERSHIP....got a problem with that? Want to diagnose cars like the Pros? FOR SALE: OTC Perception 2 channel Labscope (badged as a Matco Reality) This is my personal labscope that I use to diagnose waveforms, like new, comes with leads and training video PM Me for details
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#10
11-26-2006, 12:48 PM
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Re: Fuel Pump will not engage.
Quote:
A VOLT DROP test will tell you if there is resistance on the wires that could lead to a failure. It's all about basic electrical theory and OHMS law 
__________________
Why do you never have enough time or money to do the job right the first time, but enough time and money to do it again? Got all the certifications 25 years ASE Certified Master Technician GM WCT Yea..I work at a DEALERSHIP....got a problem with that? Want to diagnose cars like the Pros? FOR SALE: OTC Perception 2 channel Labscope (badged as a Matco Reality) This is my personal labscope that I use to diagnose waveforms, like new, comes with leads and training video PM Me for details
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#11
11-26-2006, 01:07 PM
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Re: Fuel Pump will not engage.
I was just trying to help him with basic tools a home mechanic would have available.
With my ohm meter I can check resistance which causes voltage drop. Last edited by rhandwor; 11-26-2006 at 02:55 PM.
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#12
11-26-2006, 08:36 PM
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Re: Fuel Pump will not engage.
We got it fixed. We pulled the fuel pump once again and tested it outside the tank and it ran. Put it back in the tank and it wouldn't. Bent the connecting prongs...and guess they weren't getting good enough contact b/c that seemed to get it to work.
Thanks for everyone's help....it was greatly appreciated.
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#13
11-27-2006, 03:24 PM
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Re: Fuel Pump will not engage.
Quote:
I would suggest replacing the connector.
__________________
Why do you never have enough time or money to do the job right the first time, but enough time and money to do it again? Got all the certifications 25 years ASE Certified Master Technician GM WCT Yea..I work at a DEALERSHIP....got a problem with that? Want to diagnose cars like the Pros? FOR SALE: OTC Perception 2 channel Labscope (badged as a Matco Reality) This is my personal labscope that I use to diagnose waveforms, like new, comes with leads and training video PM Me for details
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