good place to mount fuelpump

[orange69]

i am building a 69 camaro with a 454 with a d1 procharger i have a bottom sump tank. right now i have an a1000 pump and i cant seem to find a good place to mount it. im also not against going with a different pump if it would fit better. i was hoping about 800 crank hp.

[Mommy Wagon]

Mount it below the lowest point of the fuel tank if possible.

This will take advantage of "Gravity Siphon Theroy". If mounted below the lowest point of the tank, fuel will naturally flow that direction because of pressure differential. This will make your fuel pump have an easier life, as it will only be required to push fuel instead of pull it from your tank and then push it forward.

[orange69]

in that case is there such thing as to far forward? because the back of the front subframe looks like the only option.

[Mommy Wagon]

Nope.

It doesn't matter how far forward it is, as long as it is lower than the lowest point of the gas tank. Try to keep the routing as straight as possible from the tank to the pump, that's it.

Just try to keep it away from heat. If you have no choice, build a heat shield, or insulate the line and pump.

[Vegas69]

Front of the tank is the best place.

[1969CamaroRS]

Nope.

It doesn't matter how far forward it is, as long as it is lower than the lowest point of the gas tank.

I don't think that is true.

My understanding is these pumps are not very good at "pulling" fluid but very good at "pushing", so you do want it as close as possible to the tank. That is also why you also want to take advantage of gravity feed as well.

Barry Grant and Aeromotive install documentation seems to support that as well (been doing a lot of research on fuel systems trying to plumb up mine now).

Front of the tank is the best place.

Wouldn't you be worried about having fuel and electricity all in the same spot? I'm kind of worried about a Pinto type situation where a sufficiently large impact crushes the fuel pump between the tank and the rear end, resulting in a fuel spill with possibly electricity right there (worst case I know but scary nonetheless).

[Mommy Wagon]

Well it's true. It's a scientific fact on how gravity and atmospheric pressure work on fliuds at specific levels in relationship to each other when an equalizer is introduced.

Try it. Take a bucket of water put it on a counter, place one end of a hose in the bucket and the other end on the floor. The water will run on to the floor, regardless of how long the hose is. Look up "siphon theory" on Google for actual testing data.

As mentioned earlier, the pump does not want to pull, it is meant to push.

As far as electricity and fuel, every single electric fuel pump uses electricity. You cannot avoid this. A properly install pump is nearly harmless, this is why some manufacturers even submerse an electric fuel pump directly into the fuel tank and surround it with fuel.

[rickk]

take a look at the weldon pumps.
rick k

[1969CamaroRS]

As mentioned earlier, the pump does not want to pull, it is meant to push.

Which is why I think you would want the pump as close as possible to reduce the volume of fluid it has to pull.

Perhaps also another reason for installing the fuel pump near the rear is to avoid the heat of the motor as well?

A properly install pump is nearly harmless, this is why some manufacturers even submerse an electric fuel pump directly into the fuel tank and surround it with fuel.

I should have qualified my statement better. What I meant is out of the way of major components so in the event of a large rear crash it is less likely to be crushed between components (placing leaking fuel and broken electrical lines in the same space).

Looking at my 69 Camaro it looks like to me there is a little pocket off to the side of the tank that I might be able to fit the pump into (where the rear leaf springs would normally be, but with a G-Bar I have some extra space). I'm thinking that be a safer area as it would take a very large crash to crush the pump into something else.

I'm not trying to be argumentative, just trying to learn so I can use that knowledge to benefit so that I can install my fuel pump in the safest possible manner.

[Vegas69]

You can't get the pump closer to the outlet of the tank than in front of the tank. Mounting it near the leaf spring pocket will make it hard to get it lower than the pickup and won't be a good place if you plan to run exhaust pipes. If my car gets hit from behind and it crushes my fuel tank before my fuel pump who cares? The frame is so small on these cars that it makes it virtually impossible to mount a fuel pump for anything north of 500hp anywhere but in the tank or in front of it. Get under a resto mod that is as low as possible. If I had to do it over again my pump would be in the tank no doubt about it. It would also have three 8 AN fittings. Feed, return, vent.

[Mommy Wagon]

1969CamaroRS, I couldn't agree with you more.

Make sure you have a properly installed relay, as well as a MINIMUM amperage fuse for the application. If a crash happens, you will then more than likely cause a power cut off with a blown fuse.

Another option is to adapt an "impact sensor" such as Ford in the late 80's-early 90's which automatically cut power in the event of a crash or hard jolt. It was reset by pulling a "reset cord" in the trunk area.

Another option to mount is to fabricate one, exactly where you want it to be. Also incorporate a heat shield.

[orange69]

i had planed on putting fuelpump relay behind battery in trunk. i guess maybe an impack switch wouldnt be a bad idea. as far as gbar setup that is going on my other 69 no more offset shakles for me no room.

[1969CamaroRS]

Another option is to adapt an "impact sensor" such as Ford in the late 80's-early 90's which automatically cut power in the event of a crash or hard jolt. It was reset by pulling a "reset cord" in the trunk area.

I have been think about exactly that ford inertia switch, killing the power to the fuel pump.

Still trying to figure out the best place to mount. Vegas is right barring in the tank or between the tank and the diff, I don't see a good spot to keep the pump below the sump of the tank.

Another option to mount is to fabricate one, exactly where you want it to be. Also incorporate a heat shield.

That is kind of what I was thinking in the spring pocket, but it would be close to the exhaust, but as you said a good heat shield should help. Problem is with that you would have to create bracket to really hold the pump down low as the pocket is a lot higher than the tank's sump.


I am kind of coming to the conclusion a tank mounted pump would have been best. However I am carburated right now and plan on going EFI after I have the car on the road for a while so I thought an external pump would be easier to change out.

Perhaps between the tank and the diff with an inertia switch is the best solution, maybe even build a little vented shield on the sides and bottom to help protect it from road debris.

[Vegas69]

Your differential will protect it pretty well.

[Chad-1stGen]

Read the installation manual for your pump....

I just installed the Holley "blue" pump in my jet boat over this past summer. It recommended installing below the level of the fuel tank and as close to the tank as possible.

[shmoov69]

I have my A1000 in the area below the floor, between the quarter and the framerail, on the passenger side and above the leaf spring......Got it? LOL!
It seems to work great, fit nicely and you can't see it. The only problem is that you can't fit a filter before fuel gets to the pump.
BTW, it is a sumped tank.

[Vegas69]

Must have a pre filter with an external electric pump. An internal pump has a sock for a reason. One piece of debris can lock that puppy up. 100 micron pre pump.

[1969CamaroRS]

I'm planning on running a 100 micron immediately before and 10 micron immediately after the pump (which should keep the silt out of the bottom of the float bowls in the carb).

[orange69]

shmoov69 is your car minitubed because i dont think it will fit with fittings on it.

[Vegas69]

I'm planning on running a 100 micron immediately before and 10 micron immediately after the pump (which should keep the silt out of the bottom of the float bowls in the carb).

Yep...I have 100 micron pre and 8 micron post pump.