Quote:
Originally Posted by PBH
Buy a hydraulic flow control (Parker) and close off the flow adjuster. They have a built in ball check and are made for use in oil.
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Quote:
Originally Posted by PBH
Or McMaster Carr Part No. 7775K11
Or go to plumbing outlet and ask for a cast brass check valve for water circuits. Should be about $15 each and the mount vertically (gravity close) 1/2NPT.
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Would either of those divert the backflow around the fuel pump?
Quote:
Originally Posted by NICKG
can you use a nos fuel solenoid?
they must make an industrial version..i would agree on mcmaster carr
maybe even grainger
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If I get into solenoids, I'd just use a 3rd 3-port valve. I'd trying to cut down on the wiring & switching by going with something that will just divert the flow when it backflushes.
Quote:
Originally Posted by turbo6bar
Could you place two check valves in there? One would be at the fuel pump. Another would be in the bypass line. This check valve (in the bypass line) would have cracking pressure higher than the rated pressure of the fuel pump.
You could avoid this mess by making biodiesel. Then again, I am a silly bed wetter. 
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Exactly... Biodiesel is for bed wetters! Seriously, I'm not quite sure I have my head around your concept. Part of the problem is I've never used a check valve, so I'm not entirely sure what I should be looking for.