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Thread: K75S fuel pressure regulator testing

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  1. #1
    broadstone
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    K75S fuel pressure regulator testing

    I seem to have lost the followers on my previous thread re fuel issues so here's the question. I have reason to believe that my fuel pressure regulator is stuck closed. To try and test this I disconnected the return line at the fuel rail and tried blowing through it. I couldn't move air through it using my mouth so I applied approx - 25psi on the vacuum hose after disconnecting it from the throtle body and still could not blow air through the return hose. Does this indicate a malfunctioning regulator or am I totally misunderstanding the operation?
    Last edited by broadstone; 10-23-2012 at 10:49 PM.

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