Desired HPOP reading at start/no start

jdeeg4276 · Mar 19, 2013

So I've got no good reading while turning over the truck. Here is a pic of the readings
These readings are while turning over.
Thanks again.

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jdeeg4276 · Mar 19, 2013

I think the HPOP is bad. Cause of very low/no readings.

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Mdub707 · Mar 19, 2013

Verify that your LPOP is good first. If the gauge on the dash comes up when you're cranking, it's likely the HPOP yeah...

What year truck?

Lassie · Mar 20, 2013

Even if your IPR was stuck open, the HPOP should be making 200 - 300 psi, if you have LPO pressure. Even most dummy plug and standpipe leaks will build to at least that.

If its an 05 and up, you may have a seperated STC fitting. The STC is the only leak I've seen that will cause a complete loss of pressure like you have.

Some older HPOPs had plugs blow out of them, but will still register over 100 psi.

Air test it and go from there.

jdeeg4276 · Mar 20, 2013

Was the stc fitting. Thanks guys.

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Extended Power · Mar 22, 2013

jdeeg4276 said:
Was the stc fitting. Thanks guys.

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Old style STC fitting or new?

jdeeg4276 · Mar 27, 2013

It was an old style. Got ahold of new hop and no problems. I suggested while I'm there replace the whole thing.

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jdeeg4276 · May 1, 2013

New customer but thus one will start when cold and reads about 700-900 psi and still won't start. When cold will start but very slugish and then runs OK but I turn off and no start again. HPOP here we come again. New customer too..

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