surge tank set up.

[rona wagon]

Hi all, Was wondering whats the best set up to run a surge tank on my st141.
I have a 75 gph(7psi) carter lift pump for surge tank (yet to get one) what is the best tank, where to get it,
And will my pump be ok to suply a surge tank and main pump (350 hp-60psi) bosch
(bloke at the auto shop sad yes )
The car is a wagon and i would like the surge tank to be under car next to main tank?
(don't won't it in cabin)
Thanks to all of you that's help me this fare.....

[EVOSTi]

the flow of your high pressure pump needs to be less than your lift pump, unless your return line will go back to the surge tank, which i dont reccomend.

for the surge tank, look around they are available at lots of places or you can get one custom made which you might have to do if you plan on mounting it under the car near the main tank.

[Gabe]

the flow of your high pressure pump needs to be less than your lift pump, unless your return line will go back to the surge tank, which i dont reccomend.

Reason being?

[Gavatron]

The flow of the high pressure pump needs to be less otherwise it will empty out the surge tank.

The return line should go back to the main fuel tank, otherwise the fuel inside the surge tank just gets warmer and warmer.

[fixeruperer]

i dont think the car would use that much fuel and fuel is always returning to tank to get sucked up by lift pump.

[Gabe]

I don't think it will make much difference.
You would put an overflow from the surge to the main tank. The hotter fuel would tend to overflow back to to the main tank anyway

[Gavatron]

i dont think the car would use that much fuel and fuel is always returning to tank to get sucked up by lift pump.

Yeah, but if the lift pump is pumping it in slower than the high pressure pump is taking it out, it won't be able to fill the surge tank. Doesn't matter if the motor isn't using the fuel, it goes down the return to the main tank.

I don't think it will make much difference.
You would put an overflow from the surge to the main tank. The hotter fuel would tend to overflow back to to the main tank anyway

Better safe than sorry. Not like it's that hard to route the fuel back to the main tank rather than the surge.

[EVOSTi]

you definately should return to the main tank. i returned mine to the surge and couldnt figure out why my high pressure pump would die after about 15 minutes of driving. i had to pull over and wait a while till my car would go again, it was because the pump got so hot it failed. i returned the fuel from the rail to the main tank and all is sweet.

and like mentioned above if the high pressure pump flows more than the lift pump it will empty the surge tank and surge. kinda defeats the purpose of running a surge tank.

[The Real Roadrunner]

you definately should return to the main tank. i returned mine to the surge and couldnt figure out why my high pressure pump would die after about 15 minutes of driving. i had to pull over and wait a while till my car would go again, it was because the pump got so hot it failed. i returned the fuel from the rail to the main tank and all is sweet.

and like mentioned above if the high pressure pump flows more than the lift pump it will empty the surge tank and surge. kinda defeats the purpose of running a surge tank.

there is no way the fuel would get hot enough to hurt a high pressure pump unless your running the biggest magnaflow pump on the market (all 1800hp worth) on a stock 2K.

i have NEVER had a problem with running a return from the engine to the surge as thats the way there ment to be setup in the first place (they have four fittings for a reason) and i would roughly guess that its over 70 different cars ive done this with.

have any of you ever measured how hot your surge tank gets (bet you haven't) i doubt it would go over 15 degrees above ambient.

your surge tank should (in a perfect world) roughly be the same size as what the engine can consume in 1min but you can go smaller if you have a good feed pump. i generally build them around 2.5L and have not had a car surge to this day.

if you could drain a tank of that size in one WOT hit you would be doing some crazy speed at the end of it (take into account the feed pump will be topping it up also).

on a tight track/road you aren't constantly on the gas or turning the same direction (unless ripping heli's) and the fuel that returns from the engine as well as the feed should keep the surge tank full.

rona wagon, the pumps you have should be fine, provided you hook the surge up the correct way.

cheers
linden

[EVOSTi]

i know people dont have problems returning the fuel from the engine to the surge tank, but in my case i did. my fuel pump was getting very hot and my car would stop.
all i did was return the fuel from the engine to the main tank and i had no more problems. lift pump is a carter, efi pump is just a vl commodore.

[Pube]

Id get an EFI tank from a RT142 wagon and ditch the whole surge tank idea. Actually an ST141 tank and an RT142 Tank are probably the same except for the fuel pump pickup so all you would need is the fuel pump assy. This way it would be less complex. I mounted a walbro high pressure in-tank pump on the standard bracket and have had no problems with surging and so far I know its capable of around 200rwkw

[rona wagon]

Pube, did'nt think of that till to late, all ready got both pumps and half way there with my set up no point chenging it now. So is ther anything else wrong with (Rail back to surge) was also told that presher could go back up the return to rail and interfear with the preshure regulater.(true-mith)

[The Real Roadrunner]

Pube, did'nt think of that till to late, all ready got both pumps and half way there with my set up no point chenging it now. So is ther anything else wrong with (Rail back to surge) was also told that presher could go back up the return to rail and interfear with the preshure regulater.(true-mith)

should be low pressure 1-4psi tops so this shouldnt cause probs.
cheers
linden

[SIKTOY]

i know people dont have problems returning the fuel from the engine to the surge tank, but in my case i did. my fuel pump was getting very hot and my car would stop.
all i did was return the fuel from the engine to the main tank and i had no more problems. lift pump is a carter, efi pump is just a vl commodore.

The problem isn't your fuel getting hot its the shitty VL pump I have had many of these f@#k up on me

[EVOSTi]

well im using the same pump that stuffed up on me a couple of years ago with no troubles. i think they are a good pump for the money.