Ok I'm very close to starting the fuel build up.
Anyway, can I run two stock pumps with a T-78? 850cc 1600cc etc..
Or would two walbros or supra pumps be the best option?

 

Any would work, the Walbro's are physcially smaller so they are a little easier to mount. If it's cheaper do buy another stocker do that, but for the price Walbro's are hard to beat.

 

The Walbros also flow more at 65psi than the other two will. The only thing that stops the Walbro is that Bosch Motorsports pump out of the Porsche GT1. But they're like $400 each!

 

It would all depend on how you want your fuel system to be setup. Are you going to run parallel or series ? You could get a fuel reservoir and run a single high flow walbro to all injectors . May be two smaller walbro from the fuel reservoir which would run seperate to the primary and secondary before connecting back together with a fuel regulator .

 

Two walbros, unless you use a Aeromotive, or similar voltage controller, the Supra pumps will not last at 12+ volts continous.

 

Go with the 2 Walbros due to the easier mounting and more flow and pressure.

 

I went with 2 walbros. Steve at gotham racing said he would go with supra pumps.

 

Despite what these guys are saying, the Supra pump is comparable to the Walbro pump, depending on how much fuel pressure you need.


Good Link for data: http://www.stealth316.com/2-fuelpumpguide.htm

 

Thanks once again,
I'll probably go with two walbros, $100 is pretty good for this one.
The age of some supra pums or stock pumps could cause failure.
So, I'm going to run them parellel to each fuel rail.

I see what I can rig up in the next few weeks, thanks guys,
-Mike.

 

I am running 2 walbros, "y"ed together at the pumps to a single feed line. Seems to be working pretty good. Id recommend hard wiring them to a direct 12v source, as they dont seem to like the variable voltage system the stock setup is run off of.

 

what did you "Y" your pumps with? I was thinking of using the "Y" from my nitrous.

 

Iam running a single supra pump with my T-88 @ 21psi with not problems , thanks to Chris at RP. The supra pumps tends to drop pressure after constant use , therfore when had to and a seperate relay dedcated to the pump itself.

 

I'm running two Nippodensos in a Y. I should have enough fuel for anything I ever put under the hood.

 

Bosch Motorsports pump http://cgi.ebay.com/ebaymotors/ws/eB...category=33555 and it isn't $400.

 

Wouldn't that Skyline GTR pump be good for this? I wanted to do the dual pump but one BIG pump seems like it would be a lot easier than messing with plumming 2 pumps together. Does the Skyline GTR pump flow as well as....say, 2 supra pumps?

 

One big pump is also more reliable. Two pumps aren't redundent if you need both -- it just has double the chance of failure.

-Max

 

yeah but with two pumps if one fails you can still drive it home no boost instead of having it towed or replacing it on the side of the road lol.

 

ya, but if it fails during a WOT run...

I am currently running 2 stock pumps wired directly with relays. I have not had any real problems with them yet. I am however, considering going to one GOOD pump just because it would be my luck that one would fail during a WOT run.

 

Great...but how will you know one of them failed until you run lean and pop the motor...I'd rather do a roadside fuel pump swap than a motor swap

 

is there anything that could sense a fuel press drop and cut off all flow can cause a stall as soon as one would go out?

 

I'm not sure if there's some sort of "cut off" device, but if you have a fuel pressure gauge, you'll know when the pressure starts to drop. Alot of gauges have a warning feature that light up, or set off a buzzer when the pressure drops below what you've preset as the minimum.

-Alex

 

I'd have to disagree with you here Max. How often do you really hear of a factory fuel pump going out?! There's trucks/cars out there with well over 200,000 miles that are still on the factory pump. How many aftermarket fuel pumps, like the Aeromotive 1000 for instance, have even close to that many miles on them? The Aeromotive 1000, along with other large fuel pumps, also have problems with overheating and shutting off. I've never heard of a factory fuel pump overheating and shutting off. Besides, the Aeromotive 1000, along with others, are loud as hell!! Anywho, I really don't see a greater chance of something going wrong by adding a 2nd factory fuel pump, when it's rare to see problems with a single factory fuel pump.

A great example is how people always say to check for a leaky injector when your car floods, or there's a problem. How often do they really have a leaky injector?! It's not very common.

I would go with 2 Supra (Nippondenso) fuel pumps, or 2 stock pumps. I've heard of alot of Walbros failing, so i'd stay away to be safe!

Just some food for thought...If you keep an eye on your fuel pressure gauge, you'll know if something starts to go downhill.

-Alex

 

As i've already stated, keep an eye on your gauges, and you'll know if something fails. Either by your fuel pressure going down, or your A/F ratio going lean. Gauges have a warning feature for a reason!

-Alex

 

Even with one "good" pump, you still have the same risk. I'd say a factory fuel pump is more reliable than an aftermarket. How often do you hear of a factory car poping the motor due to the factory fuel pump going?! Like i've stated in a previous post, there's factory fuel pumps all over the world with well over 200,000 miles on them. Now how many aftermarket pumps have that kind of mileage on them?!

-Alex

 

well my 97 jeep fuel pump just died on me with 105k on the ticker. It was factory