Pump test pitot gauge problems

I was wondering if anyone on here can help us understand what we saw yesterday. We were pump testing 2 engines yesterday. The first went fine the second was fine until we reached the 50% test. With the proper hose layout, instead of the expected 56 psi on the pitot gage we saw 160 psi. What would cause this to happen?

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Permalink Reply by Truckie Jay on May 13, 2009 at 1:48pm
Test the pitot with the original Engine and see if you get the same 56 psi. If it's not the pitot then contact the pump manufacturer.
Permalink Reply by FF Nick on May 13, 2009 at 4:59pm
Gate the valve back, at 250psi a valve wide open is gonna put some psi on the pitot tip. Are both your trucks the same GPM?
Permalink Reply by Chad Kiser on May 14, 2009 at 6:40am
They are both single stage. The 1st truck that run fine was 1250 gpm. The second was 1000 gpm.

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