SuperMotors.net Forums
Scott Flatt
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• Phoenix, AZ, USA |
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• Registered on 1/31/2004 |
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• 8 posts |
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 Posted:3/23/2004 21:17 |
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I'm glad you and your sister got than cream puff back on the road relatively cheaply. As you know, it could always be worse.
Tell me if you have heard of or experienced this. I have the red Holley electric fuel pump located behind my axle and in front of my gas tank. I have an inline fuel filter between the gas tank and pump and another fuel filter between the pump and the carb. I use the factory fuel line until it comes into the engine bay at which point it becomes rubber hose. When I first start my car (cold) or simply turn the ignition to turn on the pump, the fuel pressure reads between 6 and 6.5 lbs. Then as the car gets hotter, the fuel pressure slowly drops until it reads zero! But, I can still see fuel in my sight glasses on the side of the carb for both the primaries and secondaries bowls. Another symptom of this is when I turn the vehicle off, over time the gas returns to the tank leaving the fuel line empty in a siphon like effect. My thought is this problem has something to do with the resulting air in the line, but I am honestly guessing at that.
Does this sound familiar to you at all? Is it realistic to try to keep air out of the fuel liine?
I found very little about this on the Internet. |
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rfedd
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• Vancouver, WA, USA |
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• Registered on 4/24/2004 |
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• 4 posts |
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 Posted:4/25/2004 03:00 |
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Electric fuel pumps are pushers, not pullers. They are gravity fed, so they need to be below the fuel tank (or at the lowest point possible). If it is in front of the tank, it may not be getting the fuel needed.
Ron |
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Scott Flatt
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• Phoenix, AZ, USA |
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• Registered on 1/31/2004 |
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• 8 posts |
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Posted:6/20/2004 12:21 |
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| Quote: | Electric fuel pumps are pushers, not pullers. They are gravity fed, so they need to be below the fuel tank (or at the lowest point possible). If it is in front of the tank, it may not be getting the fuel needed.
Ron |
Thanks Ron, sorry for the delayed response as I have been sorting out this problem for weeks while squeezing in a trip to the Indy 500. Of all things it ended up being the fuel pressure gauge itself! I went through two liquid filled gauges before I researched further and decided to purchase a non-liquid filled guage. Once I installed the new guage it fixed the problem immediately! I can't tell you what I felt like doing to those other gauges. Some websites I researched claim that manufacturers such as Barry Grant are now discouraging the use of liquid-filled fuel pressure gauges due to the effects of heat on the oil in the unit. Apparently the oil expands from the engine heat causing the gauge to skew its reading and in my case, drop the pressure reading to zero. Therefore, I wanted to put this out there in case anyone else is beating their head against a wall trying to diagnose the same type of problem. The only drawbacks to the non-liquid filled gauge is the needle bounces at times and the cover lens is plastic instead of glass. The plastic doesn't care for carb cleaner much (arg).
At least this problem got me to replace my fuel line with AN fittings and braided line like I had wanted all along.
Take care |
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