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Thread: Fuel in Optimax air pump
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07-01-2011, 07:05 PM #1
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Fuel in Optimax air pump
Just about done rigging the 250XS on my Scarab and I tried cranking up one of the engines. They have been sitting for a while so I wanted to be sure they ran before I continued with the repower.
FYI new plugs, cleaned injectors, new fuel and charged batteries.
After a few turns one of the engines sputtered and would idle but terribly rough then it stalled out and after a few more rough idles it would not start back up.
I tried turning it over a few more times and noticed that some fuel was coming out of the air intake on the air pump. I took the plastic cover off and there was a little bit of fuel coming out of there. So whats wrong with it?
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07-01-2011, 07:34 PM #2
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Isn't there a diaphram on the fuel/air rails that can go bad?? Only a guess
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07-01-2011, 07:47 PM #3
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There definately are valves and diaphragms that can go bad but I don't know these engines well enough to diagnose the exact problem. SO I was hoping someone who has more optimax experience would chime in. Its my first DFI engines.
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07-01-2011, 10:38 PM #4
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Check the tracker valve on the stbd side fuel rail. It's a guess as the pump should overcome any fuel pressure even if it were bad.
Chet Olson
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07-02-2011, 08:02 PM #5
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Swapped fuel rails with another engine and its fine now, so it was one of the valves.
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