Does it matter where you put your External Fuel pump?

Darksied101
Club4AG Regular
Posts: 28
Joined: Thu Aug 29, 2013 2:34 pm

Does it matter where you put your External Fuel pump?

Postby Darksied101 » Thu Mar 06, 2014 11:52 am

Just wondering if it makes a difference if you install a external fuel pump near the gas tank or if you put it up in the engine bay??

User avatar
jondee86
Moderator
Posts: 2733
Joined: Fri Jan 11, 2013 10:21 pm
Location: Wellington, New Zealand

Re: Does it matter where you put your External Fuel pump?

Postby jondee86 » Thu Mar 06, 2014 1:02 pm

I don't think that the pumps are self-priming, so you need to keep them
low... below the level of fuel in the tank... something like this...

Image

http://forums.club4ag.com/zerothread?id=79577

Cheers... jondee86
The reasonable man adapts himself to the world; the unreasonable one
persists in trying to adapt the world to himself. Therefore, all progress
depends on the unreasonable man.

Darksied101
Club4AG Regular
Posts: 28
Joined: Thu Aug 29, 2013 2:34 pm

Re: Does it matter where you put your External Fuel pump?

Postby Darksied101 » Thu Mar 06, 2014 3:05 pm

What would happen if I put it in the engine bay ?

User avatar
alavelle12
Club4AG Enthusiast
Posts: 90
Joined: Sat Jan 19, 2013 2:41 pm

Re: Does it matter where you put your External Fuel pump?

Postby alavelle12 » Thu Mar 06, 2014 5:21 pm

The external pumps like to push the fuel over pulling it, the closer to the tank the better

User avatar
jondee86
Moderator
Posts: 2733
Joined: Fri Jan 11, 2013 10:21 pm
Location: Wellington, New Zealand

Re: Does it matter where you put your External Fuel pump?

Postby jondee86 » Thu Mar 06, 2014 8:29 pm

Darksied101 wrote:What would happen if I put it in the engine bay ?

SR5/4AC has the pump on the engine. But it is a low pressure mechanical
pump and can generate enough suck to pull gas uphill from the tank. Most
high pressure electric EFI pumps seem to be centrifugal type, and don't make
much suck... so they might not be able to draw gas uphill from the tank.

If you can find one that will develop enough suck to fetch gas through a dry
tube from the tank (self-priming), then you could put it in the front.

Cheers... jondee86
The reasonable man adapts himself to the world; the unreasonable one
persists in trying to adapt the world to himself. Therefore, all progress
depends on the unreasonable man.

meifert
Club4AG Enthusiast
Posts: 82
Joined: Tue Dec 17, 2013 8:26 pm

Re: Does it matter where you put your External Fuel pump?

Postby meifert » Thu Mar 06, 2014 11:10 pm

You can put most low pressure pumps almost anywhere. But with high pressure EFI pumps the closer to the tank and the lower is best.
1984 Corolla SR5.....banana on wheels
Buddy Club Spec 2 Over axle, T3 Test Pipe, T3 Bomber Bar, T3 Ultimate Rear Brace, Enkei Apache 2 wheels, (Weber carb and Cam not installed)

Cheap, good or fast.....pick two.

Nick94tt
Club4AG Expert
Posts: 253
Joined: Mon Jan 13, 2014 9:43 am

Re: Does it matter where you put your External Fuel pump?

Postby Nick94tt » Fri Mar 07, 2014 10:20 am

Common sense, but worth noting on top of the above - Away from heat, and not hanging out waiting to be torn off by something on the road surface.

Once watched a bad pothole yield a toasty shell of a foxbody - long before the "moar low" crowd.

Darksied101
Club4AG Regular
Posts: 28
Joined: Thu Aug 29, 2013 2:34 pm

Re: Does it matter where you put your External Fuel pump?

Postby Darksied101 » Fri Mar 07, 2014 11:57 pm

Thanks a lot guys :) really appreciate all the advice

86hatchling
Club4AG Regular
Posts: 16
Joined: Mon Jan 13, 2014 4:04 pm

Re: Does it matter where you put your External Fuel pump?

Postby 86hatchling » Tue Mar 11, 2014 2:56 pm

Yes.
A few things to note. I set this up on my hatch recently.

Get a *Positive flow pump, like in the pic above. The valve sytem holds constant pressure and is backflow resistant.
Stay away from anything plastic or sketch like.
Make sure you get a 4-7psi pump. I ran a 17-25 psi pump for a minute thanks to a parts guy and now replacing gaskets on my carb. The 4-7psi is the proper range and all you need.

Place as close to the tank as possible, recomended within 3ft.
Consider a before pump All metal fuel filter. As well as any platsic/metal filter in the engine bay.
Do not place the pump in engine bay for a few reasons. Stress on pump, they are meant to push not pull, hence the 3ft- range. If for any reason there is failure a electrical issue or leakage, not a good place.
Run a fuse jumper off your battery terminal or fuse box.
I chose to run a toggle switch to the pump. I wanted it to receive power manualy away from any constants/ignition.

Also I placed my pump at the bend of the frame rails at the rear axle. On the backside of the rear seats side.
I will try to post a couple pics. I often run on logging roads and risk bottoming out in ditches so I placed it up as high as possible. GL