i'm trying to decide on fuel pump choice. Maybe you guys can help me decide.
2004 gto
built bottom end 5.3, 9.4:1 compression
7875 billet vsr turbo
summit stage 1 cam
ported 243's
80lb dekas
340 aeromotive with stock dead head system.

So. I was going to do two 340 pumps, then I decided against that because of extra wiring, complication and chance of secondary pump failure and me not knowing till its too late. Right now my shitty fuel system is keeping up to 14-15 psi, barely.
goal: 700+rwhp

My plans are add a 6an return, stock 3/8 feed. aeromotive a1000 regulator (have already) and I have the fuel line and fittings. Choices for single pump are Walbro 525 and a deatschwerks 9-401-1001. These two pumps are super close in actual flow and potential power, but the walbro 525 is about $100 more for about 39 liters per hour. Not sure thats worth it. These two pump are a good jump from what i have, so I'm thinking I should get at least another 100rwhp out og it if it turn the boost up a little and change pumps with a return system. what you think?

 

I’m running twin external 255’s which will support 700hp no problem. Pump failure is a risk no matter what...no such thing as a bulletproof pump imo.
You can build failsafes into the system or run one large pump, like a Magnafuel 4303 which can definitely support your power goals.

 

Hellcat pumps are $175, walbro 525 units. Make sure not to get a knock off. P/N f90000285

 

Just a point I wouldn't run the stock fuel line as a feed.

That PN is tasty. Real tasty. Pump draws almost 30A at 80 PSI too. That's a hella setup!

 

Well I’ve decided I’m going with two aeromotive 340’s through the stock 3/8 line for now. I probably should have used that for the return I know. But I’m not trying to make 1000hp and I’m only running on pump gas. If I had another 100hp then I’d be about where I want. If one 340 is handling 15psi on the stock line, dead head system....then I’m sure two pumps, and a return system will handle a little more. I’m not trying to set the world on fire or set any records. Just a nice low 10 second daily driver. If I can make a 9.99 once I get the car dialed in, I’ll be ecstatic.

 

Problem with running 2 pumps, is only when you are under full load, full boost, and the 2nd pump quits. That's a bad place to be.

 

ive already done a return system and used two aeromotive pumps. Aeromotive makes high quality stuff and I trust it will run a long time. I can tell when only one pump comes on. It falls on its face. I had it happen the other day because I did an update to my boost controller which reset my outputs to off. I forgot to turn it back on snd the first time I got on it I knew real quick. I’m now at 20-22psi and one pump just ain’t gonna do it for me.

 

Magnafuel protuner 750. Made 1,137 rwhp in a SBC procharger setup before it started running out of pump. And that's not accounting for parasitic loss from the blower.

 

Just put a boosta pump on what you got. Instant 75% or so increase in capacity. Easy to install, hell you don't even have to smell gas.
But if you want to change stuff,
I vote Demon pump and a KB boostapump if the 500+ lph won't do it. If anything fails the car won't start. No guessing or wondering. Quiet, easy to service if ever needed though you won't, I've made over 1000rwhp on a 20 amp BAP and a demon pump at 88 psi total fuel pressure (boost plus base). Less then 500 bucks total with oem reliability.

 

Lol. Read above. I’ve already redone my whole fuel system. I even built a 1.5 liter aluminum surge tank that goes in the tank. A boostapump ain’t gonna cut it lol.

 

I read above, I'm aware your system is done. I was just giving my 2 cents. Boost a pump is just a bandaid, and I dont like multiple pumps. Although pump failure is rare, it does happen.

 

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That’s $460. I already had two aeromotive pumps. I’m pretty sure the magna pump isn’t near silent like an aeromotive 340. My car is very quiet and I hate fuel pump noise. Not to mention, I’d have to have a controller for the single fuel pump. Pumping that much volume will heat up the fuel. I would have had to change my rails and run a bigger return line. I looked at those fuel pumps before doing what I did. If an aeromotive can run constantly like a factory pump and last probably just as long, my secondary pump will last years and years. I’m happy with what I ended up with. I put ALOT of time and effort into making sure it checks off all the boxes in what I want. I’ll post some pics below so you get an idea. But this is the criteria I was after:
1) had to be quiet
2) reliable
3) not extremely costly and if it fails, cheap/easy to repair
4) not have excess flow as to heat up fuel
5) not require an additional controller to lower volume, another point of failure and complexity
6) and of course be able to keep up with demand and have room to grow.
7) still be able to go WOT with very low fuel level
This is what I ended up with. I built an aluminum surge tank with two pumps

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The magnafuel protuner series pumps do not require a controller, and are made for continuous use. They are by no means a quiet pump though. My point about a pump failure under load, is that your fueling demands are still there, but supply has been cut in half. By the time the car stumbles from going lean, damage can be done before you lift your right foot.

 

I understand fully what you mean. I dont disagree either. However, I could get a clogged injecter, not know it and damage the motor. I'm real in tune with how the car feels, I have a fast reaction (not making excuses) and i've had it happen a time or two where the pump didnt come on. I let off quick enough there was no damage. I do have forged pistons which gives me a little better durability cushion for mistakes. Thats why i chose to build a strong motor vs use a stock bottom end motor. I have pulled the plugs since this happened and all is well.

A loud pump in a definite no for me. Having a 5/16 return and stock rails with all that flow from one pump will almost surly heat up the fuel. I drive this car almost as my daily (bad weather I try to avoid). I drive it out of state. I need reliable. And quiet. Know what else? My boost controller runs my secondary pump. If my primary ever goes out, I can press a couple buttons on my boost controller display and force my secondary pump to come on as long as the ignition is on. So I’ll always have a working pump.

 

I get ya on having a quiet pump. A dead injector wont make a lean condition though, just a dead cylinder. I guess I just shoot for simplicity. Complexity is the enemy of reliability. Most of all have fun with your project!

 

Thanks! I just got done troubleshooting a "fall on its face" condition at 5000+rpm and higher than 14psi boost. I had .032 plug gap. Went down to .028 and got worse. .024 seemed to fix it altho it kinda did it one time. Think i'm gonna put it .022 now. cant wait to get to the track. trying to go a low 10 or high 9 at 138-140mph..thats my goal.

 

Cool deal, what plug are you using.

 

Tr7ix iridium

 

A non projected tip plug might help if your truly getting spark blow out.

 

probably but they idle like crap. Ima tighten up the gap a touch