Why is my fuel pump only at Half pressure

Asked by JohnnyB7272 May 20, 2021 at 02:53 AM about the 2007 Chevrolet Tahoe LTZ RWD

Question type: Maintenance & Repair

My fuel pump is only pushing 35 psi the
engine light is flashing and also showing
stabilitrack and traction control light flashing
it's also showing random misfire code and the
clutch pulse width silinode circuit high code. I
put new spark plugs and cables and replaced
the  1-2 and 2-3 silinodes. I also tryed hot
wiring the fuel pump but still got same
pressure at 35, replaced the relay still no
change it's been stuck in limp mode for over a
month I'm ready to burn this dam Tahoe has
anyone had similar issues?

3 Answers
26,860

oilyspill answered 2 years ago

Battery has a full charge and battery connections all good? as far as fuel pressure, If too low, problem usually on the supply side, meaning fuel pump and fuel line. My fuel pressure spec says 50--60 psi, if right in the middle, should be fine. You can do voltage drop test for voltage wire to the fuel pump. Do the same test on the ground. In the diagram, top wire to pump is voltage, bottom wire is ground. Right now I'm thinking fuel pump? You may have more than one problem?

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