I know we've had a few fuel threads in the in the past, but i would like to bring my options to the table and another topic; reliability. I see alot of talk about fuel systems with dual pumps, but for some reason the thought of running 2 pumps makes me a bit uneasy. If one pump begins to fail or completely fails I could be looking at inadiquite fuel pressure and a lean condition. Reliability for my fuel system is a big concern for me. My power goals are moderate for now. I'm looking for a support for 400-550 hp at the moment, with the possibility of growing to 600-700 hp in the future after the motor gets a makeover. My motor will have 850cc primaries and 1600cc secondaries.

Here were my 3 options:

Aeromotive A100
(2)Walbro 255's
(2) Bosch 044's

I would love to do the Aeromotive as an option seeing how its just one pump to deal with, but i'm concerned with the longevity of the pump seeing as how it was built more for a "race" application. This is why i lean more towars bosch as an option for a dual pump system. Bosh has been designing fuel pumps for years for stock cars that were meant to go over 200K miles. They have a lot riding on that name. I'd just like some thought/input on my options and maybe add a few more if you'd like, feel free.

 

i run a dual walbro setup , i also have (for my personal peace ) a Fuel press gauge and an wide band in the car , sould a pump fail or start to become "weak" i should be able to see it

 

Hmm. I haven't see all of the other threads, but I am famaliar with the setups you have mentioned.

I tend to concur with your reliability concerns of the A1000... though in all honestly I have no "proof" that it would be unreliable myself. And I have not looked recently into what lifespans others have had experience with.

As to the Bosch pumps, I agree also that they certainly have a name to maintain. A buddy of mine pointed out that bosch pumps are used in many "high end" cars, and also said that in his experience that they were one of the unreliable aspects of those cars. Again no personal experience with them, but I trust him enough to take his expereince as my own in deciding not to go that route.

Similarly with the Walboro's.... IMO entirely.... I don't want to trust my project to the reliablity of those. I have NOT used these pumps. I have read a few people that have had problems with them, and... well, they just seem "cheap" to me. Yes I am basing my "cheap" comment on a small casing, lightweight pump for an inexpensive price. I know money doesn't always mean quality.... and neither does size etc.... but in the case of motors I do believe that you get what you pay for.

For this reason, I am inclined to go with the dual ND pumps. I already have two new ones, and having made 460 RWHP on 1, i'm confident the two will support my fueling needs. I haven't heard of 1 failure in these pumps. My expereince with them has been good. Yes they are a bit more than a walboro, and sure if they don't have enough voltage they don't flow as much etc, etc. As for the cost, I just can't see trying to save a few $100 on what could very easily be the life (or death) of a $10k motor.

I am of course open to being convinced otherwise.... but for now, I'm going to stick with what my own personal expereince says works.

-Chris

 

I would have to agree with twin supra ND pumps. Also for big flow, great reliability, and quiet performance, its hard to beat the top of the line Weldon pumps.

 

very true , the only reason i have the walbro`s is because i was in a bit of a hurry to finish this , and because of their size i can mount them quick and easy ,
another route i would check would be the 3 rotor pump itself (not shure if its the same as supra pump) but its a great pump very quiet and durable ,...and it can hold the power , 2 of those should be able to withstand almost anything you throw at them
The aeromotive pumps are good , period , but they tend to be noisy and i am not really too much into that !
I say if you have 2 ND pumps ....go for it !!

 

Noise isnt going to be that much of an issue. I dont care if i had the whiny A1000. Also will i get the same amount of flow out of it as i would from the dual pump setups at pressure?

 

given your`e lines are bigger you should have decent/enough flow

 

Here's my input...

The Walbro's tend to burn out when you run the gas low in the tank.
Due to their small size (versus output), I think they tend to rely too much on the in-tank fuel to keep them cool.

I've also *heard* the Bosch 044's have the same problem, but it's not as bad as the Walbro's.

I've seen Aeromotives fail, and for some odd reason, I don't like relying on one single (big) fuel pump for such big power set-up's.
Knight Sports in Japan runs these huge Aeromotive pumps *in the tank*, and they seem to have very good reliability with them.

If it were my choice, I'd go with dual 044's but surge tank the whole thing.


-Ted

 

ive had a few good chances to look at the fuel systems of all the mazda roadrace cars, rx2, the white and green 79 rx7, 4 rotor imsa fc, etc etc

1. they all use multiple pumps
2. all have a surge tank
3. the injected cars use the bosch pumps, like 3-4 of em, overkill...

more data points

1. i agree the walbro looks cheap, but ive never seen one fail.
2. all the bmw's that litter the side of the roads here (in CA anyways) need fuel pumps, but they might not be bosch pumps...
3. ask any mercedes/volvo owner, bosch pumps wear out, they get weak over time
4. only ND pump ive ever seen not work are ones that have sat in old gasoline for years, like for example, if the cars wrecked and in the bodyshop for 4 years....

 

true ...ND pumps are the best IMHO

 

[QUOTE=j9fd3s]
2. all the bmw's that litter the side of the roads here (in CA anyways) need fuel pumps, but they might not be bosch pumps...
3. ask any mercedes/volvo owner, bosch pumps wear out, they get weak over time
QUOTE]

Hehe, these points that I made "from a friend of mine" is a mutual aquantaince of ours. =]

One a different note kinda... has anyone tried to run the ND pumps (or walboro for that matter) in anything other than a vertical application? I'd guess the bearings etc were designed for this orientation but have no proof.

-Chris

 

[QUOTE=carx7]yep, lol, it comes from the same place.

the bosch pump that m2 sold, and is sold as an m2, is from a 930 turbo, and in that car its external and laid flat, and we put it vertical intank, and it works, so i'd think thats not a big deal?

oh and one more thing, the apexi pump is good too

 

isn`t that the GT-R pump?

 

i run dual walbros in the stock location. they are pretty noisy but I have not had any problems with them yet. the car has only been running for a couple thousand miles tho so who knows what the future will bring....