Quality External Lift Pump's

[PRIMRK]

Hey All,

Been trying to find out what lift pumps are out there, it will be used on a stock 1UZ (4lt toyota V8) but will be goin a twin turbo or ITB and E85 later on and dont want to have to re do everything when i trick up the engine. Currently plan on running an 044 high pressure pump (possibly 2 if i got forced induction)

What lift pumps are out there that can handle E85 as well as flow enough to keep the surge tank full.

The AE86 crowd are a penny pinching lot and only offer the budget solution and i want to be sure i use quality parts in this build.

Also has anyone done a pre rail fuel pressure regulator setup? I was having a chat to a few friends who mentioned that it may help with heated fuel in the lines, not sure if this is true as the fuel will sit in the rail heating up till it is used, but my logic has been proven wrong many times.

Ive also been having trouble sorting out what size surge tank to use, what size are some of the 300rwkw skylines using?

Cheers yall!

[discopotato03]

The pumps everyone tends to ignore are actually roller cell EFI ones which are good at moving high volumes when not pushing against a FPR .

Traditional EFI systems usually have an ~ 2.5 bar pressure head above inlet manifold pressure .

It may pay to look into the more current single line or return less fuel systems because I reckon this is how the manufacturers may be getting around the fuel rail heating issues . A lifetime mechanic friend of mine tells me that they are not really return less but they return direct to the fuel tank close to the internal type pump . I've often wondered how we'd go if we had the pressure regs return Teed of the supply line so the return was not connected directly to the fuel rail . If not hot fuel is returning then in theory that in the pot/tank does not heat up avoiding tank pressurisation dramas .

Also I believe these later systems run higher fuel pressure and I suppose the advantages could be better atomisation and a slightly raised fuel boiling point . Don't quote me but something like 50+ psig pressure comes to mind .

A .

[JonnoHR31]

newer commodores run returnless setups i think. only problem i can see with it on a turbo setup is it'd be hard to set one up with a vac/boost line to it and without it you'd be running a constant fuel pressue, which means reduced flow under boost and possibly tuning issues

i have a pierburg lift pump in my car, not sure if they're still around or what they flow but it does the job just fine, might be worth looking into

[FineLine]

newer commodores run returnless setups i think. only problem i can see with it on a turbo setup is it'd be hard to set one up with a vac/boost line to it and without it you'd be running a constant fuel pressue, which means reduced flow under boost and possibly tuning issues

i have a pierburg lift pump in my car, not sure if they're still around or what they flow but it does the job just fine, might be worth looking into

Twin pierbergs in mine. Almost twice the flow of the bosch and half the noise.

Quality product.

[discopotato03]

What I was inferring was to have two lines up to the engine bay but only a single one to the fuel rail .

Imagine a "T" piece with the supply on one side and the hose to the rail on the other . The stem of the T could be plumbed into the regulator and returned from its discharge to the tank . The reg being not too far from the inlet manifold can still have a manifold pressure signal to reference off .

The difference here is that none of the fuel from the rail can go anywhere except through the injectors and the supply will always be cooler in a hot engine bay . No recirculated engine/manifold conducted heat . Any boiled fuel vapor would pass quite quickly through injectors though I'd try to mount the reg lower than the rail to make it the highest part of the fuel system .

A .

[JonnoHR31]

the main purpose or retunless systems is to save on plumbing. having 2 lines up to the bay kinda defeats the purpose, might aswell plumb it into the rail then and run a normal setup.

and if the reg is as far up as the engine bay there will still be heat soak, but thats rather irrelevant, its the fuel pumps that put all the heat into the fuel.