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Re: 99 4.3 Rough Idle, Low Temp, Bad Gas Mileage
The ratings and specs are confusing.
Even airtex and Delphi have different ones and different applications/pumps are different.
The gallons per hr was probably figured at 61.6 lbs of pressure on the one you looked at.
But flow rate/gallons hr. varies with pressure and line size.
Delphi Shut off/relief/full pressure is usually 95/105 on Delphi pumps for the later V6 engines.
Airtex pumps drop the rating down to 80-90 lbs.
Running pressure is controlled by the fuel pressure regulator.
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Remember proper testing gives us the answer to many problems.
MT
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