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Fuel Press Drops When Boost Pump On

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Fuel Press Drops When Boost Pump On

Postby Paul Burrell » Thu Feb 04, 2016 12:19 am

1970 PA-24-260C Turbo

With the engine running, my fuel pressure drops 2 PSI when I turn on my fuel boost pump. Boost pump works fine for starting etc.

Dukes boost pump.

Any ideas?

Paul in Houston

Paul Burrell
 
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Re: Fuel Press Drops When Boost Pump On

Postby Zach Grant L1011jock » Thu Feb 04, 2016 3:30 am

You might be sucking air from the pump or the pump fittings, or the fuel strainer or selector. If you can't find the issues try putting a clear hose between the firewall and the engine driven pump and see if there is any difference boost pump on or off as far as bubbles etc.
"Keep it above 5 feet and don't do nuthin dumb!"
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Zach Grant L1011jock
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