Electric fuel pump trouble
I recently aquire a 1969 mustang 5.8L 351w with a holley 750cfm carb. I don't know exactly what cams it has, though they are definitely not stock. I think the electric fuel pump is pushing too much fuel. The floats are adjusted down but i still get a strong fuel smell. The holley manual I have calls for 5-7 psi. I'd like to install a mechanical pump but I'm not sure if the race cams would affect it in any way. If so, would it be better to get a smaller electric pump or add a pressure regulator to the line?
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Are you needle and seat sealing? If the car sat for a while, they could be gunked up. Pull and inspect them.
Do you have a pressure gage before the carb? |
the stock cam driven pump puts out less volume than the electric pump does. you need to install a fuel pressure regulator on the supply line, and i suggest running a return line as well, its easier on the pump and prevents overheating and boil off of the fuel. something like this should do http://www.summitracing.com/parts/qf...FYNFaQodrosMkA
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Originally Posted by 69mach1377
(Post 8509030)
Are you needle and seat sealing? If the car sat for a while, they could be gunked up. Pull and inspect them.
Do you have a pressure gage before the carb? |
Originally Posted by jwog666
(Post 8509038)
the stock cam driven pump puts out less volume than the electric pump does. you need to install a fuel pressure regulator on the supply line, and i suggest running a return line as well, its easier on the pump and prevents overheating and boil off of the fuel. something like this should do http://www.summitracing.com/parts/qf...FYNFaQodrosMkA
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pump draws from the tank, then to the regulator, pressure is sent at your chosen setting to the carb, and the unneeded fuel is dumped back to the tank
https://cimg7.ibsrv.net/gimg/mustang...1000df1091.jpg kinda like this |
That looks nice, I like that setup
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or run a good mechanical pump. I run a Carter on my racecars with a holley regulator in line. no problems ever, steady pressure. Feeding 368ci @ 8000rpm, never starves for fuel.
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no need to run a return line for a carbed set up so mild.......I run a holley blue with regulator set to 6.5 psi........make sure your need and seat are operational.........often the ethanol fuels deteriorate the rubber tip on the seat......now that is to say you have fuel pushing past the seat.......I've run my set up on a 347 with no return for 15 years and the pump is still going strong. Also when and where are you getting a strong fuel smell from?? you will always smell some fuel around the carb area depending on what type of vent system you have on the carb.........are you experiencing any running/drivibility issue??
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