mikeb89fc

Hi guys, i was sitting and thinking foe the last few days as to which fuel pump setup i would like to use for my HBP13B-RE. I was going to use a single aeromotive a-1000, and plumb a parallel fuel rail setup....

stock pump------->surge tank------>A-1000-------->Y Block-------->primary, secondary---------->fpr--------->surge tank.

But, i have lost faith in this fuel pump due to me personally witnessing two of these pumps fail in the same day....So, the cheaper and more reliable method to me was to purchase twin bosch 044's and use them in place of the a-1000.....here's where i hit a wall, i dont know if it's anything to worry about, but better to ask than to cry about my blown engine later..

This is what the new setup would be:

sp------>s/t-------->044, 044======y block------------y block=====pri, sec------>fpr------>s/t


Now before everyone gets to cooking, the reason why i have a problem with this is that if 1 pump decides to fail, i(think) i wont know until fuel pressure rises in relation to boost, and i dont wanna run 2 lines underneath my car. Thirdly, would me using two y block's hinder pressure and flow, or should i feed each fuel rail indepently with it's own pump???

rx7brandon

iTrader: (1)

I would use both pumps the same. I have 2 walbro 255's in tank(built in check valves). using -6 lines(3 ft) to the rear then y block to -8 feeding -8 10micron stainless filter then up to engine bay. then another y block back to -6 to each fuel rail then feeding into the reg. -8 return back to tank.

this setup made 442hp on pump gas 11.45 1/4et @ 16 psi. I will be tuning with race gas soon. shooting for 26psi hopefully breaking the 600hp mark. I have seen this setup make well over 600 hp on other cars.

mikeb89fc

i understand what ya sayin, but i was tryin to get past all the reducing and expanding of fittings. or am i makin a mountain out of a molehill????

My setup is as follows:
HBP13B-RE
660, 1680
msd 6al
divided long runner mani
50mm gate
fd3s upper mani, and throttle body
and i guess just about everything related to emmisions
either 6765, or 4094 turbo

i know this should be enough fuel to support it, but i dont wanna have flow issues due to bottlenecks...

rx7brandon

iTrader: (1)

I understand you are trying to simplify the system, but if you want simple buy a Honda. (lol) with the fuel system you don't want to cut corners, that leads to a new engine. buy a cheaper turbo if the money is the problem. fuel is not the place to get cheap.

mikeb89fc

you got me wrong........im not tryin to simplify the system, if i wanted that i would have kept my stock engine with the single walbro intank.

I know someone else reached this point in their build and made a choice due to an informed decision.......money is not a issue with me....and i dont cut corners, thats why this simple seeming decision is rattling my brain, because i not only want the best bang for my buck, but i want it to be able to perform as it should also....meaning i dont wanna have 2 255lph pumps installed, and by the time it reaches the fuel rail, it's down to like 200lph due to what i see as unnecessary reducing of fittings in the fuel system.

I may not be a top level rotary engine builder or tuner, but from what i learned from working on marine engines for a while is that:


smaller pipe = higher pressure, less volume

larger pipe = lower pressure, higher volume

Dorifter_LEXX

iTrader: (3)

https://www.rx7club.com/2nd-generation-specific-1986-1992-17/fuel-line-setup-852233/

^ Maybe your question can be answered there. I don't have a problem with dual pumps, but you should also look into Kenne Bell Boost-A-pump. http://www.kennebell.net/accessories...boostapump.htm In your case, you want to plumb in a surge tank, which requires at least two pumps. Well, they have a dual Boost-A-pump too. Ask BDC or Howard Coleman how great these things are, they will tell you.

Some times it's good to over think things. Gets you asking questions, nothing wrong with learning the right ways of doing things.

Here too: http://www.fc3spro.com/TECH/MODS/mods.html Fuel system*

Dudemaaanownsanrx7

iTrader: (23)

I'm running twin stock pumps in tank with a y block in tank. The rest is all run like stock. 550/1600 i'm running right around 500 hp and inj duty is 70. This setup is good for over 600 hp. The pumps are cheap, quiet and reliable. It cost like $50 to dual the pumps. I also monitor fuel pressure in the car. Lots of people use the charcoal canister line as the return, and the other 2 as feed lines. This is another option. Then you can either run a y block upfront or run to each rail.

BDC

Brent, you can get away with that on the FD as the sending unit is huge but the FC one is a lot more dinky. I could barely fit two Walbros side-by-side on that thing.

B

Dudemaaanownsanrx7

iTrader: (23)

yeah i didn't think about an FC being different. I've never seen the walbros in person are they considerably smaller then the FD pump? I had an off brand 255 lph for my bmw and it was definitely smaller.

BDC

Yep the Walbros are skinny. I don't even think they're 2" wide.

B

Brooklyn Plumbing

Hi! Thanks for sharing.. It's really important to consult an expert in terms of plumbing because It makes things easier. Also, it becomes costly if you want to solve it on your own. Better check out someone who knows what to do.

siguy2k

iTrader: (3)

You realize this thread is a year and a half old? lol

Gurew

iTrader: (4)

...i make fuel setup kits..all AN fittings etc...surge tank, 4 fuel pumps, yada yada...if you are interested i can send you some pictures