Fuel problem?
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Originally Posted by Torque1st
A filter should not be used on the suction side or inlet side of the pump.
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Originally Posted by Hypoid
I noticed the same problem with my '71, returned the lifetime pump to A-Z (10 yrs old-wow) for replacement and had same result. More intensified research (aka reading) revealed the pump would allow fuel to drain back as an emission feature. Comparison of the motorcraft and holley (miss that Holley) carbs revealed that once the needle valve opens on the motorcraft, fuel can drain out of the bowl. Past that it's just a hot start issue, with less fuel draining down the manifold. I'll probably be replacing starters more often.
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From: Wallaceburg On.
I had one of those clear filters on my truck for years. I had the same problem as you are having, took the filter apart and found that the rubber seal on the end was shot allowing air into the fuel line through the filter. Mine just unscrews, worth a look.
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Originally Posted by Green Streak
I had one of those clear filters on my truck for years. I had the same problem as you are having, took the filter apart and found that the rubber seal on the end was shot allowing air into the fuel line through the filter. Mine just unscrews, worth a look.
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Originally Posted by farmnaggie
Would you explain why this could be a problem? I thought I was accomplishing "due diligence" by installing a filter on the inlet side. Is there a mechanical issue or safety issue with installing one as such?
Multiple threads merged.
Last edited by Torque1st; Apr 11, 2006 at 04:04 AM.
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From: San Diego
I apolagize, I thought you had one of those glass filters that allow you to replace the element. As far as the filter not filling up with gas, I think that when the paper element gets soaked with fuel it swells just enough to create a restriction in air flow causing the fuel to be pushed up the line first leaving the air in the filter, I don't know.... just a thought?
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From: The Big, Oregon
I cut apart a filter at work that wasn't filling all the way, to find out why-
Turns out, inside the element, there is a tube that goes almost all the way to the end of the element. The fuel only fills until it starts going out the tube, then the air in the filter is trapped there. If you mount the filter upside down, it will fill more.
I wouldn't put a filter before the pump because of the possibility of vapor lock, due to the extra restriction in the line.
Turns out, inside the element, there is a tube that goes almost all the way to the end of the element. The fuel only fills until it starts going out the tube, then the air in the filter is trapped there. If you mount the filter upside down, it will fill more.
I wouldn't put a filter before the pump because of the possibility of vapor lock, due to the extra restriction in the line.
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That's interesting info, Ford_Six. I may experiment with turning it upside down and test that theory. It makes sense! I definitely believe that air gets trapped in the filter...When I first started the engine after replacing all of the rubber fuel lines, I thought there might be some kind of air lock in the system. I thought it would be smart to remove the outlet side of the fuel filter while it was running. I got a good spray of air and gas when I removed the line from the filter, as it was under a little pressure. It didn't help with the symptom either. Thanks for the input. BTW, I'll remove the inline filter that I installed before the pump. I thought it would be necessary since I no longer have a filter sock in the tank.
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