Question about 1985 GMC S-15
I need to know what the pump should ohm out at so i can decide if the pump itself is ok. Also what the voltage should be like in the two wires coming to the pump
You can check a new pump for resistance. You should have a power and ground wire, the power side would be battery voltage when the relay is engaged.
Posted on Jan 23, 2013
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Posted on Jan 02, 2017
SOURCE: 1996 Gmc sonoma
there could be several possibilities, first did you change the fuel filter? most often times a partially plugged fuel filter will cause the sputtering. plugged fuel filters generally lead to the failure of the fuel pump. if you have a fuel injected vehicle the injector themselves can fail, this happens often especially if regular maintenance doesn't happen. i always use an injector cleaner additive when i fill up each time. a common symptom of sputtering is a plugged catalayic converter. the engine needs to breath to run right. also check the airfilter this is important for the engine to breath as well as proper fuel air mixture. if the engine senses a loss of power due to low fuel air mixture it will try to pump more fuel then it should therefore it's basically flooding itself. try these basic fixes first. if this doesn't solve the problem then post back with more detail and i will try a different approach.. please rate this thanks.
Posted on Oct 09, 2008
no fuel shut off switch on pickups that i know of possibly bad fuel pump find your red bypass wire at relay to test pump
Posted on Mar 29, 2009
drop the tank ... use a brass punch to loosen the ring ... to find/replace the pump.
the relay is operated by the computer ...
Check for volts on the outgoing side of the relay ...
check for signal on the input side
check the pressure regulartor ...
If you are still interested ... there is lots more to this. If you are getting weak knees ... remember after you drop the tank and remove the fuel pump ... you are stuck
Posted on May 02, 2010
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