Outer Limits 4x4 Board

As some of u may of read in my other thread im having troubles with 040 pumps..

now what I am thinking is this. With a std LS1 the std toyota 4.5 EFI pump is capable of keeping up, but not so much once they are blown..

I happen to have 2 toyota pumps and am thinking of mounting them in parallel in the tank. Would be pretty easy to do and would have more than enough supply I would think.

thoughts??

Good points:
If one pump dies u can still limp home on the other (will run fine as long as not pushing too much boost) (also will have AFR gauge so will know if its running lean due to one pump)
toyota pumps seem very reliable (work in a differnt way?)

Bad points:
maybe too much flow????


Ray

as long as you fuel reg, feed and return lines are up to it there shouldn't be a problem

I can't see any issue and in my opinion is a better solution than going to an external pump like everyone else. It would be a fair bit of work to get it all in there but as you'll need the internal surgetank set up for both of them. Maybe custom tray mounted fuel cell? That's what I would have done to mine if i had a ute as it is the easiest option out of all of them and increases your fuel load so you can drive for longer

Would be very easy to mount 2 of them in tank. Heap's of room, and the in tank surge tank is very big.
I reckon I'll give it a go, as it will cost me nothing!

Just make sure you mod the surge tank so it can fill up faster or route the return into it or you'll keep frying the pumps. Otherwise go for it!

one walbro 255lph will feed a surge tank and a 500hp LS1

The surge tank doesnt need to always be 100% full, thats why you have a surge tank. When you plant it the 040 (or better still a 044) has plenty of fuel to use and when you back off the surge is refilled. I run a intank surge and 2 044's with the return going back to the surge tank and the surge then back to the main tank. Between them all the surge rarely drops. You wont need 2 lift pumps to feed the surge tank. One is fine and then put your return back to the surge tank too. Ensure the line from the surge to the main tank is big enough though or you will pressurise the surge tank and blow it up. I found this the hard way and dumped 80l of fuel in a few mins

(note tank is upside down in the pic)

Think ya got the bull by the wrong horn's cobba. I'm using twin intank pumps to run the motor. No surge tank involved.

How are you going to run two pump to the motor?? You may want to run non-return valves in the pressure lines as if one pump dies, the other pump will find the easiest path to pump fuel ...... Back to the tank.

Did think of this. And fuel won't flow the other way thru a pump. I tried.

ALso now have this set up in the car and running. So far so good. Checking it with pressure gauge tomorrow.

If it doesn't work I have lost nothing.

Willy Hilux wrote:How are you going to run two pump to the motor?? You may want to run non-return valves in the pressure lines as if one pump dies, the other pump will find the easiest path to pump fuel ...... Back to the tank.

I ran twin Walbro in tank pumps in my LS1 Turbo GQ no issues if done correctly.
If you have lots of supply to the surge you are better returning fuel from the reg to the tank as it keeps the fuel temperature down, particularly with 044 which are very old school pumps, draw 15 amps and drop off significantly in output when hot. There are better new design pumps available that supply more fuel, more consistantly as 7.5 amps current draw.
Most pumps have one way valve internally, 044's are often removed in performance applications as they are restrictive and larger external one way valves should be fitted.
Cheers

Joel

PGS 4WD wrote:I ran twin Walbro in tank pumps in my LS1 Turbo GQ no issues if done correctly.
If you have lots of supply to the surge you are better returning fuel from the reg to the tank as it keeps the fuel temperature down, particularly with 044 which are very old school pumps, draw 15 amps and drop off significantly in output when hot. There are better new design pumps available that supply more fuel, more consistantly as 7.5 amps current draw.
Most pumps have one way valve internally, 044's are often removed in performance applications as they are restrictive and larger external one way valves should be fitted.
Cheers

Joel

the return does go back to the tank as the pumps are in the tank, so not sure what u mean?

heres what i have done.

twin factory toyota EFI pumps

Looks good nice and simple! Much better than all the bull running 044's and surge tanks.

I can't see why that won't do the job. Keep us posted.

Not exxy either

Even that two pumps will suck air on decent hills.
There is no way around a surge tank or a very good fuel cell with internal walls.
You are lucky that the pump was given up and not your valves.

And i dont think a Toyota pump is more reliable than a Bosch pump anyway.
The Bosch 044 is used in Audi RS and in Porsche - it will be top of the line.
But they dont handle running dry at all.

Hope that helps
Chris