Question about 1991 Chevrolet S-10

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Fuel pump problem 1991 s-10 2.8

My fuel pump went out. i replaced it with a new one. itworked but when the gas gauge worked it run real good, but if the gas gauge went above full and wouldnt work the engine would miss and not idle good. then the motor just quit and wouldnt start. now i cant get any current to the fuel pump. i have replaced the relays the computer,i dont know what else to check. any suggestions. i also had it put on a analyser and it showed no codes. thank you,d.zacek

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Sounds like the Vehicle is POSESTED LoL ,
I would Hardwire a Key on wire around the origanal wires. Fuel Pump IS NOT going to set a Trouble Code at all ever, as it is an electrical component like headlights, as for the missfiring & guage reading above full I see nothing in commen with the 2 as long as the Supply and return hoses are
not swaped witch they cant be because it wouldnt run (thinking on keyboard) LoL-- Also check Fuel presure regulator. Hope this Helps you.

Posted on Jan 09, 2009

  • Ronnie Wilson Jan 14, 2009

    GM had a Habbit of Grounding Fuel pump Through the Oil Presure Switch AKA Oil sending unit

    Have you Checked this Probability ? The Ground isue is Bugging me a lot too !!

    You do Know that Fuel Pump hot is Pink w/ Black tracer <<<< Maybe Dmb Question

    If all else Fails Recheck wires INTANK << Yes Sorry for Mistaken swap

    Then There is the REWIRE Isue also chech out these Few T-Shots

    Oil Pressure Switch (For Fuel Pump)


    Oil Pressure Switch

    Fuel Pump Relay

    Engine Harness

    SEE ( G116) Crucial Ground & #9 is Fuel Pmp Relay


    Wiring Diagram For Chart A-5 - Fuel Pump Relay Circuit Diagnosis

    SEE The Oil Switch is ground for Pump examine closely

  • Ronnie Wilson Jan 14, 2009

    As I Said I am Trying My best to Arm you with as Much Information as I can get my eyes on to Help you Get this truck running, P L E A S E Remember to USE C A U T I O N while Servicing the FUEL SYSTEM on this and A N Y F U E L SYSTEM as One MICRO SPARK Static Electricity

    Can Change your World and your Loved ones also. SO PLEASE USE CARE , In VERY VERY WELL VENTALATED Work space. I So Hope that you have Enough Info to Assist you in Locating the Problem, Your QUESTION & Symptom is So very N E W to me. if you need any other Help Feel Free to ASK I will be glad to H E L P Rejakwilson aka Ronnie



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When you replaced the fuel pump, did you have you switch to the new harness? Check your wiring.
Could it simply be a relay?
My dash gauges went nuts but the car runs.
Do you hear the fuel pump running?
Did you replace the fuel filter? Should be on the frame under the driver.
Bosch fuel pumps are the way to go. The ret seem to **** out after 60,000.
Good luck.

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Fuel gauge dont work i put a new fuel pump in it and it still do'nt work 1997 blazer

Was the wire harness replaced from the fuel sending unit to the frame, it's a good practice to replace the wire harness when the sending unit is replaced. The wires are know to break and cause sending unit issues from weak fuel pressure to faulty gas gauges.
The other possibility would be a faulty connection to the stepper motor in the gauge it self or just a faulty stepper motor that would need to be replaced. You can do a search on Ebay for stepper motors for your fuel gauge which runs for around $15.00 which is much better then $400.00 for a new cluster if it is and bad fuel gauge stepper motor.
Thank you for using fixya and good luck.

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