My stock mechanical pump only puts out 3 psi under load going down the track and there are no performance pumps for the Ford I6 motor so I am thinking about putting an electric pump on. I need some advice on where to mount it. In previous threads it has been said that "behind the tank and lower than the tank is best so the fuel is always in the pump. I know that can't always be done though. Most guys mount their pump right next to the tank on the frame rail (assuming there isn't an exhaust tailpipe nearby." My problem is that I have dual exhaust running all the way out the back...so I DO have an exhaust tailpipe right next to the tank. So where do you all suggest I mount the pump or can I even successfully mount one?? I should also mention that I am thinking about running both pumps and just have a dash mounted switch to run the electric pump for when I am at the track.
Try behind the tank in the center of the car or in front of the tank just behind the axle. A lot of NHRA racers do that. Keep it close to the tank as electric pumps will over heat if they are pulling fuel to far. Run a filter before the pump. RUBBER mount the pump or the vibrations will drive ya nuts. Get a pressure regulator as well. To much pressure will over power the float/needle/seat in the carb.
I'm fuel injected, but I use a rail mounted pump on a hanging bracket just behind the axle and left of center on rubber isolators and I also have dual pipes that run over the axle. The bracket allows the pump to sit just level with the bottom of the tank.
You saw where mine was mounted, under the drivers seat, where the 2 steel pipes meet. Very simple. Remove the rubber that makes an S-bend there. Install pump and connect with new rubber. Its low enough it is gravity fed really well. But you will KNOW when its running, but its not too loud once you shut the door. I wouldnt run both pumps. With the mechanical in there it will restrict any benefit you are getting from the electric pump. The mechanical pump has a oneway check valve so you arent going to PUSH more pressure through it.
I'm sure I have one on my computer at home. I'll try and upload it tonight. Ryan's suggestion of where the front and rear hardlines meet is a good solution as well. Rubber isolation is key to keeping the noise down.
I would think the check ball in the pump would allow flow to the carb as long as positive pressure exists in the supply line as it just prevents the pump from moving liquid in both directions during operation.
I made a bracket that drops down off the brace in front of the tank where the straps hook in..... It will be infront of the tank and even with the bottom..... Here's a pick of mine after I welded in on while the car was upside down on the rotissorie..... One could easily be made and bolted on also.....
Well that would make sense, I was just thinking out loud. Still would be a restriction for the increased flow and pressure. Then wouldnt the prussure go up and down with both pumps running? I regulator after the mechanical pump would be able to handle the changes. But if you have the electric why not run it all the time? Hook it up to a relay so it runs with ignition on. If you do remove the mechanical I have a chrome Ford Motorsport block off plate for the fuel pump hole you can have.
I agree. Too much fuel flow might lift the needle and flood the carb. A good electric pump with a regulator would be plenty.:Handshake
these were the best pics I could find of the pump. The bracket is a piece of 16ga flat sheet steel that I used a sheet metal brake to bend just right to mount to the frame support that the tank straps attach to. I used thread-serts for attachment and a rubber bumper at the bottom to prevent vibrations. and the filter. I ran the lines down the RH side due to the inlet of EFI on the RH
Leaving the mechanical pump in the system will be a big restriction. If you are just using a feeder pump to supply fuel to the mechanical, then that's different, but volume and pressure will not increase past the mechanical pump. The other part of this is are your fuel lines too small to feed all the fuel you need? Stock fuel lines restricted fuel flow when you are under WOT. You may want to get bigger lines from the tank and pump to the engine since you are racing it..
I agree. I would run only one pump. If you're experiencing fuel starvation, line size might be an issue but the stock lines are 3/8" to the pump, and 5/16" pump to carb. You could mount the pump near the tank, pressurizing the 3/8" line, put a regulator in the engine compartment and up the regulator to carb line to 3/8" as well. It would be a good ideal to put a gauge on it to see if you are dropping fuel pressure.
