Question about GMC Sonoma
2001-2004 gmc sonoma 4.3 [X, W Eng.] fuel system specs: 60-66 psi when you turn the ignition key (fuel pump) on without starting the engine. If fuel pressure drops back down quickly after fuel pump stops working (works for only 5 sec.) then you have a bad fuel pump or leaking injector spider.
Posted on Aug 10, 2012
2.2L Vin 4.... 41-47 psi Ignition switch is on and fuel pump running
2.2L Vin 5 ... 55-60 psi " "
4.3L Vin W .. 60-66 psi " "
4.3L Vin X ... 60-66 psi " "
Posted on Feb 07, 2010
Should be attached to the fuel rail. The fuel rail connects all of the fuel injectors. The regulator will have a vacuum line on it.
Posted on Dec 09, 2009
Testimonial: "thanks for the help and it fixed the problem."
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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