Walbro pumps

[blown69nova]

Is anyone here using twin 255lph high press. pumps in line not intank?
Looking to support 700+ rwhp. My A1000 has found it's limit.
Thanks, Steve

[Blown353]

In line installation?

If so I'd much prefer the Bosch 044 pumps over the Walbros. They're already set up for external or internal mounting and have proven to be more reliable.

How much are you taxing your A1000? You might also want to consider a Kenne Bell Boost-A-Pump. I run one with my SX fuel pump and have it bumping the fuel pump voltage to 16.5V at 4 psi of boost. Works great and the pump picks up about 110 lb/hr of flow with the extra voltage which gave me more than enough safety margin.

[blown69nova]

These pumps I am talking about are similar to the Bosch 044 as far as mounting, I'm not talking about the intank style.
The reason I am looking at the Walbro's is the price and I hear they are very reliable.
Steve

[Blown353]

These pumps I am talking about are similar to the Bosch 044 as far as mounting, I'm not talking about the intank style.
The reason I am looking at the Walbro's is the price and I hear they are very reliable.
Steve

My experience with Walbro's has been hit and miss. I've dinked with probably a dozen of the 255 lph (intank variety) and about 4 of them failed in very short order, not even making it a week on daily drivers, and when they're 3rd gen F-bodies that really sucks as the tank removal/install is a PITA!

For the most part I've had OK luck with them though, good pumps for the price in terms of output, but as I said my experience with them has been spotty. Never used the external style however.

[ss dave]

Correct me if wrong but I thought the A1000 was capable of up to 1000 hp NA and 800-850 hp FI.

[camcojb]

Correct me if wrong but I thought the A1000 was capable of up to 1000 hp NA and 800-850 hp FI.

well, he's forced induction I assume by his username, and 700 rwhp is 800+ at the crank. I made over that with an A1000 but swapped to the A1200 to avoid issues.

Jody

[ss dave]

Thanks Jody, I was curious because I recently swapped my Ricks walbro tank for the Stealth tank with the A1000 to avoid fuel issues with 630 crank hp. The only drawback I see with the A1000 is hot fuel.

[Karch]

Steve, what size lines are you using? What about the fittings?

Flow will decrease as line size decreases, and also with more fittings, etc.

I think you'd need a pair of Walbro's to support that much power, run in parallel.

Also, check your running voltage at the pump, especially at peak demand. They really show a drop off when you get below 13 volts...but check the specs.

[andrewb70]

As stated above, double check the voltage going to any pump that you choose. The best thing is to wire it directly to the battery, through a relay.

Andrew

[blown69nova]

I have -10 feed, cell to filter/pump, -10 to second filter, -10 to y-block and -8 to each fuel rail. I have an Aeromotive a1000 reg. and -8 return line. I use all Aeroquip full tubular style an fittings and braided hose. I also have a 75a relay with all wiring 8ga.
When I stated "inline pumps", I meant parallel. I just wanted to let you guys know they would not be "intank pumps".
I like the idea of the Walbro or Bosch pumps because of their "oem" reliability (or so I thought).
Also, if I run two pumps in parallel, with one on continuosly, and the other one turning on under boost, do I need a check valve so fuel does not back feed through the "stationary" pump, or do they have one built in?
Thanks, Steve

[Karch]

What are you using for a pressure regulator?

Regarding the check valve, not positive, but I would run a check valve just to be safe. I have read more than a few times that you want to be sure to have the same, or preferably larger return to the tank to be sure your regulator is doing the regulating, and not the line itself.

You may get a surge when the second pump comes on, and that may create some problems further downstream (a/f ratios). Also, you must be sure you don't get any cavitation...now or with the twin setup, as that will surely produce a lean condition at best, kill the pump(s), and take out the engine at worst (not to mention what happens to the other things that can go boom when you go lean).

There are meters that can measure you're fuel flow, but you really ought to get the fuel pressure monitored while at peak HP and beyond. You should see a dropoff if the pump can't keep up.

I would imagine a pair of the Walbro GSL 392 would be sufficient, at least from a fuel flow standpoint, as they can support probably 450 hp boosted (higher BSFC).

I'm curious about the "Y" block. Have you considered running straight into one rail, another line to the other, than out to the FPR and back to the tank?

As mentioned, make sure you get enough voltage to that pump at all times. Even wired directly to a battery, you may only have 12.7 volts, which would yield less output.

[Doug F]

The Walbro's have a check valve so you should need to add one. I've seen good reliability with the Walbro's.

You should be able to run them in parallel and just turn the second one on when you hit boost. Running a single return line at that point should be fine because the majority of fuel flow is through the injectors anyhow.

I'll most likely be adding a second Walbro to mine if I run dry nitrous rather than going to a bigger single pump

[blown69nova]

I am able to datalog fuel pressure, that is how I know my pump is dropping off.
I am running a Aeromotive fpr "good to 1000 hp", with a -8 return line.
The fuel line is not the restriction since at lower pressure the pump is flowing more fuel,the engine is using less fuel and the pressure is rock steady.
Thanks,Steve

[Karch]

Well, it sounds like you are just maxed out on the pump, like you thought.

I guess the options are twin pumps, or an even larger single pump.

Keep us posted if you don't mind.

[blown69nova]

I am looking at:
2-Walbro 255lph
2-Bosch "044's"
Magnafuel ProTuner 625
Aeromotive Eliminator
Weldon pumps seem to be the best, but, ouch.
I want it to be streetable and support my power needs. I don't want to use a boost a pump or any kind of controller (besides my ecu).
I see Kurt Urban's (W2W) killer Nova uses 2-Bosch pumps and goes low/mid nines and is streetable.
Any thoughts or suggestions?
Thanks,Steve

[camcojb]

I am looking at:
2-Walbro 255lph
2-Bosch "044's"
Magnafuel ProTuner 625
Aeromotive Eliminator
Weldon pumps seem to be the best, but, ouch.
I want it to be streetable and support my power needs. I don't want to use a boost a pump or any kind of controller (besides my ecu).
I see Kurt Urban's (W2W) killer Nova uses 2-Bosch pumps and goes low/mid nines and is streetable.
Any thoughts or suggestions?
Thanks,Steve

I'm running twin Bosch pumps in my twin turbo Chevelle, and the Mule uses the same at over 1000 hp. They work well, and are quiet being an oem pump. One runs all the time, second pump (in parallel) is activated via a hobbs switch whenever you're under boost.



Jody

[blown69nova]

I installed my new Magnafuel-Protuner 625, I will keep you guys posted with results.
I just have to find a nice straight piece of road!
Thanks for all the replies, Steve

[Karch]

Good luck.

Also, if you intend to sell your old parts, I know someone who may be interested.


Karch

[blown69nova]

I have an Aeromotive A-1000 and regulator that is setup for carb but can be used for efi with a spring change.
The pump only has about 1500-2000mi on it, the reg. has less.
I would like to get $200.00 for both.
My cell # is 414-839-3125
Thanks, Steve

[Karch]

Hi Steve, I sent you a PM regarding both.

I can send you payment this week.

Thanks.