Fuel pressure loss at high rpm
Looking for some help tracking down a fuel pressure issue. Port & star both idle at 7lbs. At around 3800, port begins to fall off and sometimes dumps right off to 1 above 4500. I get out of it at that point so I’m unsure if I’d lose it completely above 5. Occasionally if I walk it up really slowly, pressure will hold. Things I’ve already tried -swapped upper&lower pump(both new 2x) -new fuel lines from tank to carb -inspected tank, no issues or anti siphon -swapped senders& gauges from other engine(same result) -ran fuel line directly into 5gal can to eliminate a tank problem -lobe seems fine in water pump. Changed oil -bypassed water separator i did run it in a hose once while looking in the tank. The only odd thing a noticed was that when throttled back to idle quickly, an air bubble spit out of the pick up tube. I have no idea what would cause air introduction since I’ve replaced every line. |
tank vent lines kinked?
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I lightly pressurized the tank. Movement through the vent. Also ran from a gas can on a quick run to eliminate a tank issue. |
Check your fuel pressure regulator |
The lower is a KE self regulator between 6-8psi. No other regulators. |
How much HP and what size fuel lines??
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560 with -8 lines. The pump should be able to support 800+ hp. |
Nobody’s dealt with a similar issue ? |
Suction hose collapsing ? |
Pump part #?
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