edge04

iTrader: (9)

After pulling out my sending unit I discovered there is no way I can fit 2 walbro pumps in my tank. So I am going to have a bung welded into the bottom of my tank and run an inline pump. So my question is what is the better option, A or B? Option B will cost abour $250 more which is not a big deal.

A: Keep the 1 walbro gs340 pump in tank and run new walbro gsl392 or bosch 044 inline pump. Y together. In tank pump will be on a Hobbs switch, each will have a relay and a pre pump filter and 1 filter after the Y. This would require running new wiring for the new pump, etc.

or

B: Eliminate intank pump and block off. Run 1 magnafuel 525 pump. Less wire, not heating fuel. But is this over kill. Not sure what flow rate I need....is 77gph (462 lbs/hr) enough? There are other pumps for less money

Both systems will Y off before the engine to 2 -6an lines to run to the back of each rail and crossover with -6an line in front. Then from the driver side rail it will run into a FPR and from there back to a return line to the tank.

BTW the motor is a SC LS2 making 650-700rwhp. Some say that 1 bosch 044 inline might be good enough but that might be right on the border???

MIGHTYMOUSE

iTrader: (59)

i would do a bosch in tank by itself or a walbro in line with the original.

what tank is this going into where you can't fit two walbro's?

edge04

iTrader: (9)

it is a custom tank made for my 1971 camaro. the hole is only 3 inches and can't be made any bigger. I can get then in one at a time but then they will just be flopping aroung in there.

you think the one bosch 040 would be good enough? that pump is 300 lph

http://www.boschfuelpumps.com/

XtremeDime

iTrader: (16)

I believe he has a 71 camaro. Well 1 walbro 255 is rated to 255LPH and theres like 3.8liters in a gallon so 77gph*3.8=292lph. The 525 is about 15% better than a walbro 255. I dont think that 525 will be able to do it alone IMO.

XtremeDime

iTrader: (16)

Run 2 044s, if youre going to be putting down 700whp on a blown motor you will need the extra fuel to keep from running lean at the top end. Im pretty sure 1 044 will get you to about 600.

edge04

iTrader: (9)

you are saying run 2 inline vs one big one???

I just think the 1 in tank bosch might not be enough

XtremeDime

iTrader: (16)

The 1 intake wont be enough but neither will just 1 Magnafuel 525. Tthe 525 will outflow a Walbro 255 by 15% but that is too close for comfort atleast for me. I would say 1 intank and 1 inline or 2 inline should do it.

edge04

iTrader: (9)

The 525 says good up to 1000 HP??

XtremeDime

iTrader: (16)

Im just looking at the math behind it, 1 525 only flows 290lph. A walbro 255 flows 255, most people run 2 of those walbros to reach the power level youre looking at.

edge04

iTrader: (9)

ok, what about the 625 that flows 150gph?

what I am wondering is, what is a better set up, a dual pump, 1 intank - 1 inline system or single inline pump system.....forget about cost becuase they are less then $300 between them. thanks

XtremeDime

iTrader: (16)

The 625 would definitely be a better choice. As far as which one is better....having 2 pumps will enable you to still drive home if one goes bad. Inline pumps are easier to change but are louder. Im not sure about the difference in reliability between them all.

edge04

iTrader: (9)

well I am leaning towards dual pumps as I am not sure about the noise of one big inline pump

Nasty N8

iTrader: (33)

The MagnaFuel 525 will flow alot more than that. It will make about 800rwhp easy. If rubber mounted the noise is not all that bad. If you plan more power in the future the 625 would be the choice but then you are moving alot of fuel and could have heat issues if not properly setup.

edge04

iTrader: (9)

just ordered my 525 ^^^thanks nasty!

Need to get my tank back and then will map out the rest but should I replace my current return line which is 3/8 OD 5/16 ID alum line with -6an or even -8?