Unstang

iTrader: (26)

What are most of you using?

I have twin external Walbros. Had some fuel pressure issues last summer when it got hot.

I think lots of cars run these, anything I should look at before I ditch them for something more expensive?

westtexasbuff

iTrader: (40)

Look into the magnafuel pumps, they are great on the street for continuous use. Or you can go with twin in tank Deatschwerks. I'm using a Magnafuel 4303 and I plan on driving mine on the street a lot (on e85 though).

Bob@BruteSpeed

iTrader: (16)

You might need a larger fuel return line. Bob

Unstang

iTrader: (26)

Anyone else ever see a fuel pressure drop when it is hot?

87silverbullet

iTrader: (11)

Yeah, it drops because you might be boiling the fuel and causing cavitation. You need to look at your system and find the issue. How is the pump mounted in relation to the tank?

Guys have used twin intank systems for quite awhile now. You might want to look into that.

MIGHTYMOUSE

iTrader: (59)

wild guess, you are running both pumps all the time

run 1 all the time, turn other one on when you race, or have it come on automatically vs. tps or boost or rpm

runsfromdacops

I run 2 bosh 044s on the street. They will run forever.

L92 fox

iTrader: (2)

Im running a 255 in tank and a A1000 kicks on at 4 psi from a hobbs switch. I have the 2 lines connected with a y block with a check valve after the A1000.

CBAR02SLP

Posted this a while back, but I forget where...

I'm in the South and can expect really hot temps (+90*F) every summer. Power Tour, Cocoa Beach, was 103 I believe and it stayed that way till Indy.
Was running an external Tsunami and I could depend on the car shutting down after about 30-45 mins of ops whenever the ambient hit apprx 90* F.

Worked with Aeromotive for over two years trying to solve the problem. Re-did the entire fuel system at least three times per their directions...no help. I thought I was crazy until I met guys on PT with the same problem. Finally went to an Aeromotive in-tank 340...my car is apprx 560 rwhp...(they provided it...good guys) and problem solved (and yes I run a speed
controller).

All the manu's are offering in-tanks now with the capacity you need...save yourself some headaches and go in-tank.

Good luck

Unstang

iTrader: (26)

Yes, both are on with the key.

I have a sumped stock tank, the 2 pumps are mounted between the bumper & the tank, level with the top of the tank.

Yep, the 90+ degree days is when this happens. I talked to some Aeromotive guys at Sema this year & didn't get much direction, since I didn't have their pumps.

Good info guys. Thanks!

MIGHTYMOUSE

iTrader: (59)

like i said run one all the time, cut the other one on when you need it.

LS1RedZ

iTrader: (19)

Run a hobbs switch for the other one.

87silverbullet

iTrader: (11)

Well first I don't know if the pump mounted that high is a good thing. I would think it needs to be a little lower.

Second, I think you might want to go in-tank and put one on a hobbs switch and leave the other one wired direct.

Mightymouse^^^ has ran Walbro's in-tank and he has done a 2 and 3 intank pumps. He did it cheap as hell too. Pumps from New Era Performance for 99 bucks and couple of fittings from the Home Depot. The 2 set-up ran to 900hp on his car. I couldn't find the vid of when he turned on one pump at a time and it was 3 pumps. When all 3 pumps were on, it looked like a garden hose at your house was on.

I copied that setup with 2 TBI pumps to run a carbed setup.

LS1NOVA

iTrader: (12)

Two external walbros here. Mostly street time. Like MM said, one on full time, the other on hobbs switch. Make sure its gravity fed. No problems with heat here. Two on all the time is killing it.

HydroStream6

iTrader: (16)

Twin in tank Walbros, both running all the time on E85 and I haven't had any issues in 90* summer heat.

stevieturbo

And there is one of the worst possible mounting locations for pumps that do not suck.

EFI pumps must be gravity fed. ie below the level of fuel in the tank.

It may not be your only problem, but it is a problem.


Ive had my 2 x 044's running all the time for years. No problems whatsoever, even with continuous 4 hour drives. You certainly dont need to stage the pumps, although if you can easily do it it can make some sense.

Unstang

iTrader: (26)

Looks like I will be moving the pumps and adding a hobbs switch.

What HP have these pumps have done on E-85? They may be a whole new fuel system, if I go that way.

Thanks again for all of the info!

Jason

LS1NOVA

iTrader: (12)

They seem to be pretty safe to around 700rwhp on E85. Ive used mine at 650 but now planning on 800rw so Im adding a third pump that will come on with the second pump.

Stangkilr

iTrader: (47)

I am running two A1000's.

Unstang

iTrader: (26)

I've been watching your build thread, love it! I saw the twin a1000s & it made me think about switching around. You have 160# injectors?

I have 96#...