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Orfice fitting on filter

4303 Views 8 Replies 5 Participants Last post by  dlblack
What is inside the fuel return line orfice to the filter top mnext to the schrader valve. Did a clear line check for air and had lots of air back to the filter. Couldn't blow or suck thru the orfice, so ran a needle thru it and retried air check, now the air goes back into the filter and clears to solid fuel. There seems to be some kind of check (rubber ?)inside the fitting. Motor seems to run alot quieter now. /ubbthreads/images/graemlins/shrug.gif

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It's a rubber flapper check valve somewhere between 1 and 3psi I think. It's meant to maintain fuel recirc helping to keep fuel cool while keeping positive pressure to the IP inlet. The needle may have ruined it if it can pull in air from the drain line as things cool down after shutdown.
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