well im in a pickel, im just putting together a fuel system, and started to wonder about the dual walbro set up from flow blown, im kinda just wondering if its safe for a street car to drive it normally and be able to cun the car close to 'E' i want to keep the drivability on my car, and not sacrifice.

what are ur thought?

 

I have alot to say about this setup. Hopefully I can remember everything. First off, I had a problem with my setup but the dual pump concept worked:

1. I couldn't get the second hose clamp on onto the upper end of the intank hose. the hoses were too close together because of where the fittings are placed.

2. I kept bursting the hoses in the tanks every so often. One at a time.

3. Because I couldnt get the second hose clamp on the intank hose all the way, it would tear where the hose clamp was sitting on the bottom of the fitting.

On the 1/4 tank issue. I had no problem running it to less than a 1/4 tank. Just be aware of:

1. If one of your hose has a tear in it, the car will not be able to go to a 1/4 even sometimes 1/2 tank. It will starve of fuel.

2. What I did in my setup was added another fitting to the return hole and routed a hose back where the fuel pumps suck fuel up at just like stock. That helped out alot because for some reason I had fuel coming back up through where the wires comes through the hole.

Another thing, if you are going to run E85, don't let it sit in the tank for a long time. It will soften up your intank hoses and cause problems.

I had never gotten the system to run perfect at all lastyear. I tell you what though. I became a master of putting those pumps in the tank. As easy as 1,2,3.

 

Did you use the submersible fuel lines that were supplied with the kit? There shouldn't be any issues with clearances or hoses bursting if you use the proper line that is supplied with the kit. We have these hangers in many local cars with ethanol in them for quite some time and never once had to pull the unit out.

 

im in mn and stopped in with alex when he was having his gsr serviced at ur shop.

now i hear lots of negitive feed back saying at a half a tank theyll (dual pumps) will start sucking in air.

 

I don't see why they would start sucking air if the unit is still submersed in fuel.

 

I couldnt agree more, if the kit places the pump in the factory location and your still sucking air then one of your lines going from the pump/s to the pump cover is damaged or not fully connected.

 

Well I've spoken to other local shop and they tell me not go that route an do it right and sump my tank

 

I've used the Full-Blown kit on a couple of customer's cars.

First time around was a little bit of a PITA, but now it's somewhat of a walk in the park.

The concept works, it functions, and it's cost effective. Sure sumping the tank is the preferred way to do it, but fact is if the car sees street driving at all, it can potentially be a burden.

 

It was cheaper for me to sump my tank with dual 044's then buy a hanger and dual 255's, not to mention being able to support more power and pressure.

 

why can it be a burden to dailydrive a sumped tank?

 

^^^ because the sump hangs below everything else under your car, you hit something and you got a big problem...

 

what is the hp limit on the dual walbro?

 

I made 563whp with a single walbro, factory wiring, and all stock lines so I don't see why this setup can't support 900+whp... I now run the fullblown dual walbro setup, wired direct to the battery via two 40amp relays, with -10 feed and -8 return lines... Maybe I will get to test it to the low-mid 800whp range if I can ever get my engine issues worked out haha

 

whats drivability like?

 

I have a kinda different ? about dual pumps.
I already have a 255 walbro, but Im thinking of going to E85.
I have a spare Bosch 255lph external pump.
How do I go about hooking that up?
Do I just put it in line with the other pump?
Does it have to be close to the other pump or can it be up front like the 044's get installed?
Just random questions.
Sorry for thread jacking OP.

 

install the Bosch anywhere after the Walbro and before your fuel rail, it does not care where you put it, and yes it goes inline with the other pump.

 

Yeah thats what I figured.
Just go inline with the other one.
Just wire it up like the other one is.
Do you want both to work at the same time?

 

yes obviously you want both to run at the same time, you cant flow water out of a garden hose when the end is crinked shut, and no water will flow if the source isnt pumping if you get where I am going.

Wire both pumps with independent relays powered off the battery or alternator triggered by the OEM pump power wire, i believe the wire is blue on my car. Use 10ga wire and make sure each power wire has its own fuse.

 

The only difference in driveability came when I switched from 1000cc injectors, to 1600cc... the pumps themselves really make no difference as far as driveability over a single walbro, or even a stock pump, aside from being a little louder...

 

my sump hangs 1.25" below my gas tank. If affects absolutely nothing sits up a couple inches over other things. I guess when I take my 900hp car off roading and I'm climbing boulders it might get in the way.

 

What about speedbumps and/or dips in the road? I dont know about where you live, but I could find a dozen things within 10mi of my house that could destroy a sump on our low cars, especially if you dont have a stiff suspension.

 

Yes I used the hoses that came with the kit. I couldn't get the second hose clamp on the hose. They were sitting close together. I tried everything. I don't see a problem with e85 if the car is driven, but mine sat in the garage for over 45 days because I went to a training excercise. Drove it around for a couple days then a hose softened up and took a dump. Didn't have no problem with the car sitting with gasoline in the tank though.

 

I think maybe the problem is that the return hole does not drop the fuel back where it's suppose to go (where the pumps suck fuel up at). You can hear when the dual pumps suck the fuel up so fast. My fix for that was adding that extra return hose inside the tank so that the fuel goes directly where it's supposed to. Learning to put the system back in the tank with that hose adds extra headache to putting everything back together. But, practice makes almost perfect. I'll see if I got time tomorrow to open up the tank and take a picture.

 

255 intank with a 044 inline is my vote

 

I was always under the impression you didn't want to route the hot return fuel directly back to the source for the pumps.