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I have a F115 with 1200 hrs. Recently when I run at 5000 rpm, after 4 min it either slows down to idle speed and runs rough or stops. The ball is empty and if I quickly pump the ball it runs again. I changed the external fuel/water seperator and the fuel filter on the engine. Checked the fuel lines to see if there were any air leaks, but did not see any. After changing the filters, I still have the same problem. Any suggestions?
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Is the tank vent blocked? Just a thought.
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As said above, a closed tank vent will allow the engine to run until the tank forms a vacuum and then starve the engine. This happens more with a full tank, than one that is very low on fuel, and it happens about every....4 minutes.
Look for a kink in the fuel line, particularly where a battery, ice chest or anchor may be pressing against it while running.Comment
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Thank you for your reply. I checked tank vent, by running with fuel fill cap off for 4 min and same thing happened; so it can not be vent, but thanks again. I also checked fuel lines for kinks. The longer ling goes straight from fuel/water seperator to tank and the shorter line makes a gradual curve from fuel/water seperator to engine and is not kinked.Comment
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"by quickly pumping the ball it keeps running"
ya answered your own question.
the primer bulb simply bypasses the engine fuel pump and fills the VST manually.
check for air leaks/restrictions between the pump and the bulb then check the engine fuel pump.
they dont last forever ya know.Comment
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Thank you for your reply. How do I check the fuel pump? Also, if I run at 2000 rpm; it will run just fine, all day long.Comment
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