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What must the fuel pump preasure be - Cars & Trucks

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800_Psi.

Posted on Apr 07, 2015

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Depends on the year make and model.
Some fuel systems run at 35psi, and some run at 70psi.

Posted on Apr 07, 2015

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SOURCE: I'm working on a 2000 chev suburban with 6.0

The rear only supplies fuel to the front tank. The front tank has the high pressure pump in it, to supply the fuel rail.

Posted on Dec 05, 2009

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This code is saying the fuel preasure is too high, this may be caused by a stuck fuel preasure control valve or a bad fuel rail preasure sensor, you would need to first check the valve to make sure its not stuck then test the preasure sensor, to test sensor a scan tool would be very helpful. hope this helps.

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This sounds like a weak fuel pump, put a preasure gauge on the fuel rail and check the preasure with the engine off turn on the key and preasure should be 47psi to 51 psi.lower than 47 replace the pump, a few pounds make a big diffrence when trying to start,

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there are two fuel lines on left side of engine if you trace the lines to the rail one after the regulator is the return line disconnect it and place line in bottle turn on key and measure how much is being drained to bottle should be very little if thers none then its the pump problem .always check power and grounds be for you replace the chek the plug right before the pump on frame rail at left rear leaf spring have seen problems with that plug. if you do replace the pump allways grind clean ground by the pump. hope this helps.

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