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Old 04-26-2013, 09:48 PM
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poor mans fuel return

So m old square electric fuel pump died. So i got a bigger one. I decided to do a return line for two reason. One helps keep pump cool, so it last longer. Two, the truck sits a lot. the ethanol in the gas sucks up water. I have installed a water separator. This way i can just turn the key and let fuel circulate. Cant afford those 100 dollar fpr with a bypass. So what i did was get a fuel shut off valve for a mower. For running just crack it a little so there is some return. Then when i wont to remove water just open it up and turn the key and let it circulate.


So yall think this will work are am i looking for problems

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Old 04-26-2013, 10:13 PM
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If there's not a flooding issue at idle, then take it down the road. From a dead stop floor it and let it run through 1st and half of 2nd, if it runs good and has good power then it's okay. If it bogs down at WOT then it's not getting enough fuel volume and the return is too great.
When I removed the TBI on my 92 chevy silverado I slapped on a set of vortec heads with ferrea valves and a single plane intake for marine applications topped off with a Quadrajet and a vacuum with mechanical advance HEI, I put a small jet out of a holley carb in the return line in efforts to keep the fuel pressure below 5 psi. First try it was too small, fuel pressure was over 6 psi so it was flooding. I removed the jet and went up 1mm at a time with drill bits until it was right at 4.5 psi. It ran great at take off and cruise, but when at WOT it bogged down and cut off due to lack of fuel volume. I finally got tired of playing with it so I ordered a Holley bypass regulator, set the fuel pressure to 5 psi and no more problems.
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Old 04-26-2013, 10:29 PM
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I do have an fpr its set at 6. the mower shut off valve comes off the oter side of fpr. when the shut off valve is just cracked it hold 6 psi.
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Old 04-26-2013, 11:15 PM
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I was referring to fuel volume which isn't related to fuel pressure. Fuel pressure can be moved around to some degree without effecting the fuel volume any or at all. Rule of thumb is higher pressure doesn't always mean higher volume.
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