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how to check fuel pressure

This is a discussion on how to check fuel pressure within the General Help forums, part of the LSx Technical Help Section category; I think I may have a bad fuel pump. How do I check it??? and with what???? thanks i advance...

  1. #1
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    how to check fuel pressure

    I think I may have a bad fuel pump. How do I check it??? and with what????

    thanks i advance

  2. #2
    Member ttocs's Avatar
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    98 z28 m6

    Well you can check if you have pressure by taking the cap off of the fuel rail on the drivers side rail. Looks like the cap on a bike valve stem, works the same way too. If you dont hear your pump when you turn your key then theres something wrong somwhere. Check both fuses and your relay. If all of that stuff is good and you dont have pressure then odds are your pump is bad. Then again, all that stuff checked out for me and it wasnt even my pump that was bad. But im in a rare situation right now that no one has been able to figure out........

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    is there a guage that measures presure???Canyuo chec it with the car not running????

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    Member lrader99's Avatar
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    flat black
    when you first energize the ignition(KOEO) the PCM will cycle the fuel pump for 3 sec... to verify 60 PSI of fuel pressure on the fuel rail...the fuel system is a returnless style...meaning there is no fuel pressure regulator...fuel pressure is monitored by the computer and is pulse width modulated for a constant pressure....if you dont have fuel pressure on the rail and the pump is running start tracking packwards...see if you have fuel pressure after the the fuel filter(driver side sub frame rail) if the fuel filter is clogged thats your problem, change it then reverify fuel pressure...if not...trace the lines...you probly have some sort of restriction...

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    Junior Member CKramer's Avatar
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    Quote Originally Posted by bernieblackbird3
    is there a guage that measures presure???Canyuo chec it with the car not running????
    Yeah your auto parts store will have a fuel pressure gauge that costs about $35. It has a special adapter that you hook right on to the fuel rail. You measure the pressure both with the key at on (not running) and with the engine at idle.

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