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skywalker45
New User
Sep 8, 2007, 7:03 PM
Post #1 of 1
(1766 views)
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2001 GMC Jimmy woes
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To all who might be of assistance. I've had this very strange problem with my 2001 GMC Jimmy 4WD. It has the 4.3L Vortec with the csefi fuel injection system. It has been starting rought for awhile and the other night it finally died. I thought maybe a tune up was in order so I replaced plugs, cap and rotor, fuel filter, air filter and PCV valve. After all of this it still wouldn't start. It is getting good spark and fuel is making it to the fuel meter module at the rear of the carb. I bought a fuel system pressure tester. You hook up this device to the Schrader valve on the high pressure line. I hooked it up and turned on the key. For a couple of seconds the fuel pumped hummed as it pressurized the system. According to the manual for the pressure tester the system should hold pressure. It went up to about 30psi and then when the fuel pump kicked off the pressure dropped to zero. An auto parts guy told me it's probably the fuel pressure regulator. I bought one ($50) and then discovered this little device is located UNDER the fuel meter assembly (plenum). How in the world to you remove this plenum. I can get the injector plug off and the fuel lines but how is the plenum supposed to come off? Also what are the chances that this could still just be a faulty fuel pump and if so why didn't the line hold pressure? Any advice would be appreciated.
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