Question about 1999 GMC Yukon
I measure it right at the connector at the fuel pump at the tank. Problem is this is pretty tough to get to in most cases so you have to be pretty flexible to reach up and get the connector disconnected from the pump module plus you'll only have power to the connector for about 2 seconds each time the key is cycled "on" so you'll need help when testing it. I would have the actual fuel pressure tested before heading to the tank as its actually quite rare to be low on voltage back there [I've only found about 3 with bad wiring in several years] I see a lot of pumps get weak or fail on these at about the 120K mark so if you are close to that mileage this could be your problem. If the fuel pressure is good however you probably have another issue that's starving it for fuel.
Posted on Jul 14, 2010
Testimonial: "Thanx for the info - I was thinking of measuring the voltage post relay (Fuse Relay Center), as the relay "clicks", but I was wondering if the contacts were "dirty" (high impedance) - Any thoughts?"
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Posted on Jan 02, 2017
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