SoCal Jet Boats
Tech Talk => Engine Mechanical / Electrical => Topic started by: 79charger on April 24, 2011, 01:24:17 PM
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Have a BBF with Holley 750 street avenger with vacuum secondaries , Holley red fuel pump , and a electric "helper pump" . have 6-8 psi at idle , drops to zero at full throttle 4200 rpm and the rpms bounce up and down from 3900 to 4200 like it is not getting enough fuel to maintain ...... BTW all new parts . Thanks guys
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what size lines?
sounds like a bad fuel pump
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have u tried it without the "helper pump"?
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3/8 Fuel Line , I never run the helper pump except to prime the motor after it sitting . Could the electric fuel pump be bad or slowing down the fuel flow from the mechanical one ???
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have u tried it without the "helper pump"?
thats what im thinking, try one pump at a time.... hell get a good mech pump and dont look back
remove the unused pump to try the other
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3/8 Fuel Line , I never run the helper pump except to prime the motor after it sitting . Could the electric fuel pump be bad or slowing down the fuel flow from the mechanical one ???
the mechanical pump is probably struggling to suck the fuel thru the impeller of the electric one when its not on.
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Ok I will remove the electric pump then ..... Should the pressure stay 6-7 while a load is on the motor?
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Ok I will remove the electric pump then ..... Should the pressure stay 6-7 while a load is on the motor?
yes
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Thank you