69 mustang race fuel pump/filter location - Hot Rod Forum : Hotrodders Bulletin Board
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Old 09-01-2010, 02:52 PM
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69 mustang race fuel pump/filter location

Guys,



I'm re-doing the fuel system on my 69 fastback due to a dead Holley pump. I have a worked 302 with the 125 shot of nitrous on it, but I'm planning on upgrading the motor so I'm doing a system that will allow me to do that. I think I have the system planned, but I'm having difficulty deciding where to place the fuel pump and filter. Previously I had them in between the leaf spring and inside quarter panel, but this is tight as you can see from the pics. Also, the folks from Barry Grant said that the pump is gravity fed and needs to be lower than the tank, but the tank is pretty much the lowest thing on this car (on most cars) so I'm not sure where it can go. The old pump has been working right where it is for 20 years so I'm not sure if I need to worry about that, so long as I keep enough gas in the tank to keep the gas pushed up to the filter. If this is a big concern then I'm thinking that I will need to maybe go with a fuel cell. The system I'm planning needs a 10AN return line and the guy from BG said it has to go in in the top of the tank. Can it be very close to the top but just on the side, or does it truly need to be in the top? What have you guys done?



Mike
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Old 09-01-2010, 02:59 PM
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Sorry forgot the pics. Here they are.
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Old 09-01-2010, 05:18 PM
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Return can be in the side, close to the top. They just don't want the return fuel to have to push its way into the tank against the weight of the fuel in the tank, like it would have to if it was at the bottom of the tank. The return needs to be free flowing from the regulator/bypass/return start point to its exit into the tank, any pressure downstream of the regulator/return start point will raise system pressure on the return side and start to negate the regulator setting.
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Old 09-01-2010, 05:21 PM
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Quote:
Originally Posted by mike69
the guy from BG said it has to go in in the top of the tank. Can it be very close to the top but just on the side, or does it truly need to be in the top? What have you guys done?
I've always emptied the return into the top of the tank/cell where there is only air. If you return it into liquid, there will be some restriction to the return flow. At least that's my way of thinking about it and how I was taught many years ago.
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