External injection pumps
Turbo Mini Forums

Hi All,
i run a van and have been in talks with benjamin on here re options for fuelling... he suggested i use an external injection pump instead of modifying the tank for the return line.. he drew a pic i've neatend a little below explaining how the setup works.. just wondering which pumps would be suited to use for this sort of thing combined with the metro turbo regulator?

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Edited by thomen on 19th Sep, 2007.

i have a van and i have the external pump. external pumps are better in my opinion than spi or mpi tanks (as you know they dont fit in a van) but the return should go to the tank. returning to the back of the pump does work but is not the best idea.

do you have any pics of how you ran your fuel lines?

so what fuel pump are you running?

and is your setup tank to pump to regulator with return back to a brazed inlet on the van tank? where did you put your return on the tank?
thanks,
- tom

Hi,
I've got an Estate, same tank.
I was going to send the return back in through the filler neck pipe.....
You may also want to think about the pick up pipe too, when low on fuel and cornering hard it will be drawing in air instead of fuel. I'm going to use a fuel swirl pot.
Cheers,
Gavin :)

Edited by Bat on 19th Sep, 2007.

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Bat, why dont you just return it to the swirl pot?

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"

Hi,
Well I do, then the vent from the swirl goes back into the tank.
You may not have a problem running a carb, but I don't think it'll do the pump much good over a long period....
Cheers,
Gavin :)

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Edited by thomen on 20th Sep, 2007.

I'm not returning to the tank but rather than a simple "T" piece I found a biggish fuel filter that has 2 inlet pipes and one outlet. One inlet comes from the tank, the other is the return from the regulator. I reasoned that having that small "reserve" of fuel in the filter may help and you need a filter anyway, why not!!

So far so good, no problems seen...

Terry

Edited by Turbo Tel on 20th Sep, 2007.

website:- http://www.terryhunt.co.uk

what sort of boost are you running terry? and how long have you been running that setup? metro turbo fuel pump?

and bat! sorry just wondering so youd run something like this?
i just drew a little diagram to try and understand... i work better with pics at this point!

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Currently just 8psi but 'll be going up a few psi in the next week or so. When you think about it the pump just pumps fuel at the same rate regardless of how much fuel is being used, the higher the boost the less fuel gets returned.... in my book the toughest test for this type of return is when the engine is idling.


When I was looking into this I found that in general, the people who said it doesn't work had not actually tried it... and whats to loose?? if it doesnt work you just go back to plan "A"


I am using a generic pump that was bought from an online place
http://www.efuelpumps.com/fuel-pumps/E8603-898L.htm
I looked for one that was not super high pressure, just sufficient for the job, I think it cost me $90 or so..


Terry

website:- http://www.terryhunt.co.uk

many years ago mine returned via a "T" to the back of the pump. it worked perfectly! on top of this my metro turbo pump was mounted at the top of the inner wing!

i changed it as in my mind you could be circulating fuel vapour and air rather than dumping it back into the tank. also the pump should be install as low as possible and could have strained the pump as it was so high.

the advantage of T-ing the return is you dont have to fit the return pipe to the tank and you dont have to remove the filter in the tank. i had to cut the tank open to remove the filter then weld it back together.

i've now welded 3 old tanks and only had 1 explode!!!

i had problems with a lean-out when i did this on about 20psi...

but to be fair, the pump was goosed as i later found out, and it was in the early days of setting my car up. that said as soon as it was gone, so was the leon out issue even with the goosed pump.

so is the general concensus to add a return line to the tank around the base of the fuel filler neck.. when i got my tank recod i think they cut the filter out... and would i need to run a swirl pot also?

or just tank -> pump -> regulator -> return to tank?

you must have a filter before the pump!

ok so it'd go tank->filter->pump->regulator->return to tank (braze fitting around filler neck)

do i need a swirl pot? and id just run a metro turbo fuel pump?

you dont need a swirl pot and yes you need a metro turbo fuel pump. The metty pump can be found in the breakers yard on rover SD1's or use any injection type pump with hose type connections

Hi,
I'll be running 2 pumps. 1 SU type electric pump to feed the swirl pot. Then my injection pump from the swirl pot to the engine and back. Then the swirl pot returns to the tank.
Take a look at this post http://www.turbominis.co.uk/forums/index.php?p=vt&tid=8377
Cheers,
Gavin :)

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I just run a pump to FPR and return to top of tank...why re-invent the wheel?

Can't see any pro's/cons of doing it another way, apart from if you run the return to pump inlet it saves drilling a hole in the tank.

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1/4mile in 13.2sec @ 111 terminal on 15psi

Hi,
The estate / van tank is long and flat, and across the back of the car.
It suffers from fuel surge much more than the upright saloon tank, hence my decision to go for a swirl pot.
Injection systems don't like air in the fuel rail :(
Cheers,
Gavin :)

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hi bat!
thanks for the replies!
would you mind drawing a really quick diagram of how the pumps will work?

or will it be

tank->filter->supump->swirlpot->regulator->injectionpump->tank?

If thats the problem couldn't you just mount the fuel pump on the rear subby?

That way it will definitely be below the outlet of the tank and you shouldn't have any problems.

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1/4mile in 13.2sec @ 111 terminal on 15psi

Hi,
Mounting the pump on the rear subframe wouldn't solve the problem as the outlet on the tank is almost at the top :(

Cheers,
Gavin :)

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Couldn't you use that as the return and fit an outlet to the bottom...

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1/4mile in 13.2sec @ 111 terminal on 15psi

Hi,
Well you could, but I didn't want to start chopping tanks around.
As I'm extending the filler neck, I thought I'd drop the return in there...
Cheers,
Gavin :)

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