Need some opinions on fuel pump location. I took the picture below looking up at the rear bumper. Obviously, we are talking about a large bumper car. As we all know, the large bumper cars have the heavy metal bumper insert that is very substantial. This provides an outstanding mounting point for fuel pump pre-filter, the fuel pump and maybe a post pump filter as well. My only concern, safety. In the event of a rearend accident the pump is right there! What do you think. Also, if this is unacceptable where would you mount it? I have a Holley blue fuel pump. There is a convenient location on the undercarriage roughly beneath the driver (not in the car) but this is quite a distance from the tank and pumps work better "pushing" vs "pulling".
Im putting mine further down stream inside of a frame rail or near the side of the tank. Im gonna use a relay with a crash failsafe from Ron Francis, like the Factory one on my wifes E250.
when my car was rear ended my fuel pump was behind my rear valance. the crash broke the fuel filter off of the pump and drained my whole cell out on to the road. there was no fire or explosions. on my next build the pump will not be at the back of the car again.
Resto, I have a relay and inertia switch! Where were you planning to mount the inertia switch? Mine is located on the driver side trunk bracket. I was thinking about mounting it on the bracket behind the trunk lock cylinder. Sounds like the rear bumper may not be safe. Fuel leaking isn't a good thing! But, the pump would be "higher" than the tank and it should turn off on impact. I also have an external cut-off switch. Bryant, you have a small bumper car so no protection at all. Did the pump keep running? Also, I was planning to mount the filters and pump with hose between to allow natural flex. If filters are mounted directly to the pump I suggest using a separate fabricated bracket to mount them together. Thanks for the responses.
My wifes is under the passenger kick panel at least thats where the reset is. I was thinking of mounting it in the center consol with the rest of the switches. Im working on a custom consol that runs the length of the cabin. The current stock headlight and wiper switches will be Ron Francis Synergy Pull On for Ignition and Pull to start Temparary. All the other switches will be on panels in the consol. Im making it very hard to drive or steal this car. The Interior will look kinda like Bryants Mav.
the other thing on the back of my car was my battery shut off switch. the hit of the accident broke the switch. the power in my car was off with the switch still in the on position. so my pump did shut off. now it was the pre filter that broke off. its hard to see the pump and filter but that was the results. the ford fuel pump inertia switch is an ok idea. they have been know to have the inner contacts burn up when bigger fuel pumps are used than they are designed for. also a decent bump could trigger it. in most ford cars with them, its located in the trunk area and in most ford trucks its located just above the passenger feet on the inner fire wall. i dont know how many trucks ive fixed no start problems by either just pushing the reset button after the passenger has kicked it or has come unplugged from the passengers feet. ford is the only manufacturer that uses the inertia switch. that says that its not very necessary. most rely on the fact that the if the fuel line brakes the fuel pressure to the motor will go away and the motor will die. when engine rpm drops below a certain point the computer turns off the fuel pump. the same can be done with an oil pressure switch. thats how gm did it in the 80s and 90s. the fuel pump would get power during cranking and then need to see oil pressure when the key is in the run position.
Bryant, the reset button is on the inertia switch. The inertia switch on my 89 Ranger was mounted in the middle of the passenger side floor board under the carpet. The fuel pump on my 77 Comet is mounted to the driver's side frame rail under the rear seat, but it's a Mr Gasket 12S, there may not be room to mount a Holley pump there.
Plenty enough for three carbs. The only time it falls short is when the inline fuel filter needs to be changed. With EFI..........pressure is too low.
I've switched back to carb, haven't changed the name! Interesting idea to use a small pump such as the 12s. How is it for noise and durability? How long have you had it? Do you run a filter pre and post pump. If you are running a small filter I would think it would clog often.
Mr gasket 12S Baddad, I have less motor than you (302, X303 heads, Ecam, shorties, air gap and 600cfm carb). I assume the 12S would be able to keep up. Also, I assume it is far more quiet than the holley blue. I'm concerned about durability. I'd like to know if you run filters on either side of the pump and what size you are using. I don't want to install a filter that plugs on a regular basis. Also, the inlets are quiet small. I'll be running -6AN line. Thoughts?
on my 75 ,I mounted my holley red pump on the front side of the tank. There is a plate about 1.5 in in front of my tank its about 5 in wide and 18 in long. the pump is about 10 inches from the fuel outlet.
Bryant, The ford inertia switch would hold up fine to larger pumps if it was wired to the switch side of the fuel pump relay.
I'm assuming here you're going to go with a carb ? (your screen name says otherwise ?) The 12S is quiet and extremely reliable, this one is 5 years old now. I ran a similar Purolator pump on my 89 Ranger for ten years without a hitch. All I did on the Comet was splice the pump into the existing fuel line using 3/8" fuel hose and an ordinary metal inline 3/8 filter. I've changed the filter twice in 5 years. As long as the filter is not plugged, there's more than enough fuel for full power runs thru the 1/4 and up to the topend (140 mph) it's never starved for fuel, except when the filter needs changing.
