snagalittle

I have been searching for the picture of the 2 walbro fuel pumps banded together. I cant seem to find it. If someone would post it on here I would be much obliged

adictd2b00st

i'd be interested in this as well..... *bump*

z8cw

https://www.rx7club.com/forum/showthread.php?t=152421

There is a oicture inthere somewhere, not sure if it was two walbros.

I am interested in how the pumps are wired. Anyone has info on that?

Thanks
CW

RETed

Do a search for walbro and supra in a web search.


-Ted

bdls

https://www.rx7club.com/forum/attach...postid=2024143 and https://www.rx7club.com/forum/attach...postid=1173317

teamafx

iTrader: (4)

I dont really want to, but if I must I will pull my setup

Maxthe7man

How were you going to run these? I am running 2 staged at the moment via the haltech e6k, I tried running them both at the same time, but my Fuel pressure reg(mallory) loses control of the fuel pressure with so much fuel and won't drop below 40 psi no matter what the setting, and thats with a 5/8" return line to the tank... Would like to see how this works with other FPR's..Max

snagalittle

Ok these are the pictures i asked for. You ran these and cant turn the fuel pressure down huh. I was kinda wondering about that. I am in need of more fuel but not for shure the best way to go. I have two walbro pumps. I would rather do a single pump but i dont know if there is one that can pump enough fuel. I have a large street port with a t51r kai turbo and water injection. Need a high amount of fuel. I have the aeromotive fuel reg. Any ideas?

Thanks for the pics guys.

SPOautos

Whats wrong with a base of 40psi?

mmonaco

I dont have a problem controling my twin walrbos that are in parallel with a aeromotive FPR, and both are running on high the whole time!!

SPOautos

The best way to wire them is to run two 10 ga wires from the battery straight to the pumps as well as thier own 10ga ground wires. Each power wire has a 25amp fuse by the battery and a 30A/40A switched relay in the hatch, mine are hidden behind one of the plastic panels. You use the stock power wire for a trigger switch wire on the new switched relays.

When you run your 2 power and 2 ground wires in thru the tank you'll need to drill two holes, one for the powers and one for the grounds. Make the holes just a little bigger than the two wires, install a grommet in the hole then fill in all around the wires with a good fuel safe epoxy, silicone might work but its soft and the wires might move around easier than if it was epoxy.

Thats how I did mine....sorry I dont have any pics

Stephen

Maxthe7man

The problem is, it does not respond at all to engine vacuum, so you can't really tell where it set as a base, once you start to use alot of fuel via the injectors, the amount returning to the tank decreases, as it decreases, the fpr will start to get control of the pressure, if the pressure setting is below 40 psi, you could actually drop fuel pressure as you start to use more fuel, making tuning difficult, as well with very large primary injectors . so its not really a "base" pressure, its a defualt pressure that is merely hit by the restriction of the fpr in the system.. And at the same time, with 1600cc injectors used as primaries and secondaries, 40 psi is far to high to get the car to idle with such large injectors, it needs to be in the 30-32 range with the haltech injector resolution..max

z8cw

Wooh,
that is very involved. I guess just splicing the additional pump in in the back would burn out the one relay?

sevenin7

Who can help with a diagramm ( 2 pumps in stock tank ) , one for the primary fuel rail ,and one for the secondary ?????

manatecu

iTrader: (6)

I run two wal's with one feeding the primary - other secondary rail. To do this simply tap a hole in the top of the tank lid for a bulk head fitting. Run each pump to one of the stock inlet/outlet holes. Run each line up to the front via seperate hard lines. Run each line to a rail. The the exit run a seperate line from each rail back to both sides of the FPR. The center exit from the FPR goes back to tank via the third hard line (Vent line). In the rear connect to the bulk head fitting.

Additionally you will need to run a length of tubing from the bulk head fitting down to the bottom of the tank. This keeps the fuel from splashing and creating excess gas.

For power you can simply splice the lines in the tank to the current lines. One the exterior replace your lines with 10guage wire. Replacing all of the stock wire up to the front.

Lastly, bring the fuel relay in the front of the car to keep full power to the pumps.

I am using an SX regulator, 6an SS lines, and I can pull my fuel pressure down to ~28psi at idle. I run stock 40 psi with 890's and 1680's. My tuning was done with a PDF, Datalogit, and Techedge.

I have never had a problem with running out of juice or problemw with the fuel system.

Goodluck
Chris

sevenin7

Thanks , Chris
What is PDF ?

manatecu

iTrader: (6)

Sorry man - PFC. A PDF is an adobe file - got work on the brain.

Chris

manatecu

iTrader: (6)

Looking back I have an issue with SPOauto's post about drilling a hole in the top of the tank or tank lid. ShawnK did this and had a horrible time keeping pressure in the tank. In fact when it got hot outside the fuel smell was horrible. There are alot of pressures on the tank and lid. Use a bulk head fitting with a 90 degree in it. Run the wires through and fill full of silicone. Lastly crimp the ends closed a little. No problems. The grommit way did not work for Shawn and I.

Chris

chris_stampe

I was planning on doing AN lines and an inline pump w/ aftermarket regulator, but this thread got me thinking. I have walbro in tank right now w/ stock lines and regulator w/ 550 primaries and 1600 secondaries. I still have my stock pump, so could I just use that and the walbro, have 2 separate systems so the pressures didnt matter so much. Have the stock pump feed the primary rail and get another stock regulator, and have the walbro feed the secondary rail w/ the stock regulator on it. Then run a new return line of course. Then tune the bitch out w/ my micro and wideband. How does this sound?

manatecu

iTrader: (6)

I know someone that has a wal and stock pump in the tank. I would put the stock pump on the primary side. Splice together the wires and hotwire the regulator.

You don't need to run a full return line. There is three hard pipes beside each other. Use the third and disconnect and throw away the charcoal thing. Tap the lid of the tank with a bulkhead and your done.

Tune the reg to get you back to stock and they start with the computer.

Chris

krieger9

Anyone ever run a parallel setup, with a T between the 2 feeds incase 1 pump fails?

Busted7

The fuel pressure regulater does the same thing for free. And if you loose a pump with any setup that runs duel pumps your probley screwed, that includes me.

mono4lamar

iTrader: (32)

Yes, if you lose one of the two pumps at high boost you will blow your motor. That's why many people opt for one large single pump. It's a gamble...

Busted7

And if you loose the charcoal thingie dont forget to create a vent for the fuel tank as thats one of its uses. With no vent you would be suprised how much pressure it makes[ ask how i know]