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What external pumps are you guys using that seem reliable. I will be coming out of my sumped tank to a Y, then dual pumps to a Y, then single line to the fuel rail (filters before and after pumps). Each pump will have a ck valve. Main reason for dual pumps is fail safe, one pump fails, activate the other. Also will have the ability to run both pumps if needed, prob around 550 HP as a guess. AEM, Bosch, Walbro, etc, I was looking at the AEM 450's, but prob over kill, not sure if size affects reliability.
Holley dominator 12-1800 is a twin pump in a billet housing. Can be wired to control pumps independently. Works great and a lot quieter than a lot of the other pumps.
Give the man a warning... the 4303 is loud. Like really loud. I'd run one as a second pump on a hobbs switch. But not as a primary pump on a 550hp street car. And this is coming from guy with a roots blown SBC with exhaust that exits at the bottom of the front fender on my street car. But that's a good kinda loud, lol
One in tank setup I liked was the Tanks Inc setup with the sump, and the return goes into it, would help in a non FI tank. Still would be only one pump, although I guess not much diff than driving your everyday veh. on a trip, except it has avail. parts, lol. Kind of hard to believe the 1/4 NPT fitting would supply enough fuel, and return, but I guess it does. They have several pump sizes. I seem to remember using one of these setups, but I think I used their tank also. Of course not much out there for a 76 AMC Hornet, lol. I have a new tank coming, i'll see how much flat space it has on top.
The other thing about the magnafuel is you can buy the “smaller” pump which is actually the same size with lower flow volume if it suits your needs. Then if you add power later magnafuel will rebuild it to 4303 specs for a small fee. I started with a 4301 I think it was and maxed it out then had them build it to 4303 specs. This way you aren’t recirculating excess amounts of fuel. Loud, but so reliable with the simplicity of a single pump.
I just can't justify buying a 1500 HP loud monster pump for his power goals. Its overkill and then some. Also not cheap!
IMO the genuine Bosch 044 are probably the most reliable pump on the market. . I'm still up in the air on the AEM400 inline. I've run a few now and have one currently. No failures, but mine whines and make odd noises randomly with VERY few hours on it.
Running 2 pumps and having one kick on magically as the other fails instantly isn't going to work well either. How would you setup that logic? What would control them? Or would you just run them both all the time? Which will heat the fuel quite a bit and be unnecessary for the most part? Its adding complexity and a redundancy system that's just not necessary for your goals IMO. If you run 1 pump and it fails, its likely going to drop pressure fast and not hurt anything. Don't overthink it... some sort of AFR safety setup would be money better spent.
Also putting 2 Y's in the system is a poor choice for performance all around. .Much like the Holley 1800 series... its a horrible design. (I'd never go with those pumps) Each pump should have it's own feed. Y's are ALWAYS bad, especially before the pumps. Also be sure you don't choke the pump with some ridiculous small micron pre-filter. 100-120micron or larger pre-pump and ensure it has plenty of surface area. Don't run a filter w the surface area for 1 pump on 2 pumps.
You are running a relatively small amount of power. don't overthink it and keep things simple. 1 044 will support 700ish on gas. I'd go that route or the AEM. The price point on the AEM is hard to beat. I just picked one up for $135 shipped.
Last edited by Forcefed86; 09-08-2020 at 07:57 AM.
Very true! But a single AEM400 flows enough for 800-900hp at $135 cost. 2 of them flow more than a 4303 and are still a fraction of the cost. And if reliability and constant duty pump that won't super heat your fuel is the goal... I ran a 4303 in my rx-7 with alot of street duty. -12 supply and -8 feed and -8 return. When my fuel got to 5gal or below (12 gal tank) it got pretty darn hot! Not that that's a huge deal... but the pump itself got very hot as well. It never skipped a beat... but It's not ideal IMO.
I run ethanol and have had no fuel heating issues. I can’t say if pump gas would be an issue, but that goes back to what I mentioned about their smaller pump that can be rebuilt for higher volume later if need be which is exactly what I did. Furthest I’ve driven is one and a half hours each way, but zero issues. I’ve plugged the damn post pump filter a couple times though.
The only issue I ever had with fuel heating was when I had a big in tank pump with a dead head system at the rails with regulator in the tank. That system was a **** show. Magnafuel pumps
Keep in mind their ratings are crank horse power on gas so don’t be scared of that 1000 hp rating for their smaller pump at the link above.
What external pumps are you guys using that seem reliable. I will be coming out of my sumped tank to a Y, then dual pumps to a Y, then single line to the fuel rail (filters before and after pumps). Each pump will have a ck valve. Main reason for dual pumps is fail safe, one pump fails, activate the other. Also will have the ability to run both pumps if needed, prob around 550 HP as a guess. AEM, Bosch, Walbro, etc, I was looking at the AEM 450's, but prob over kill, not sure if size affects reliability.
2 pumps is mental for only 550hp.
A genuine Bosch 044 is about as reliable a pump as you'll ever find and will easily do 550hp.
I actually installed a 2nd AEM400 this weekend in my car. (E85). 38 minute cruise 86* ambient. My fuel temps were 125*. Currently running both pumps constantly, just wanted to see how it acted and test for leaks. I was surprised how hot it got. I had about 6-7 gallons in the tank.
I actually installed a 2nd AEM400 this weekend in my car. (E85). 38 minute cruise 86* ambient. My fuel temps were 125*. Currently running both pumps constantly, just wanted to see how it acted and test for leaks. I was surprised how hot it got. I had about 6-7 gallons in the tank.
Do you have any data on what temp vapor lock or other issues become a concern with E85 vs pump? I think pump has those issues earlier and can even lose octane due to being heated. Is that true or can you share anything on that topic?
Fuel temp measured where ? And same place as before ? what were temps before ?
And with a reg out back, I presume you're dead heading up front ?
What lift pump, and are you returning fuel to the small tank, or back to main tank ?
recirculating fuel around the small/surge tank will cause it to get hot, ideally you want all returned fuel to go back to the main tank, but that does then necessitate a lift pump that will have enough flow at all times.
09-01-2020, 07:31 AM
External pump pref. 
