Magnafuel External fuel pumps

[norbs]

I talked to BG they don't recommend the bg5000 filter for fuel injected engines. The filter will tear collapse inside at high psi. The magnafuel mp-4701 pumps are not recommended for more than 30 minutes use, and will overheat.

The Magnafuel pumps can be run at short periods of time at 16 Volts no problem, but no less than 12.5.

The mp-4301 pump will flow 1.5 gal/min @12.5 volts@70 psi.

 

[karolko]

Hey Norbs,

i also spoke to the boys at magnafuel about the voltage vs. flow thing.

For the inline mp-4301, the since the pump is being cooled by te fuel it will last considerably longer than the 4701 that is for sure.

now when i asked them how much the pump flowed, they also said 1.5gpm at 70psi and 12.5v, at 14.4v they said it would flow 1.9ghm at 70 psi.

what i forgot to ask them is how much more the pump would be heated up from the added draw of the pump.

I am probably going to go with the 4301 (1500hp) pump and i guess it is just a matter of weather i want to run it at 12.5 or 14.4 V

the only reaon i would run the pump at a lower voltage is if i knew that i would still have enough fuel flowing to the injectors, and at the same time i would be reducing fuel temps by now having the fuel circulating as much. Or is the difference in flow from 14.4 to 12.5v negligable in terms of fuel heating???

Hopefully this makes sence?

 

[V6UnderPressure]

Lonnie, this pump looks affordable. Which one would you recommend for a 500-600hp car? The 18203??? What else is needed if running a stock fuel rail? Tips would be greatly appreciated as I am going external. Is this the one I'd want? SX Performance EFI & Carburated In-line Electric Fuel Pump*::*SX Fuel Pumps*::*SX Fuel Systems*::*Fluid Systems Engineering

Looking for another response to my unanswered question.:biggrin: I also see the 18208 as a possible pump but wondered if it would work for a turbo application. Id like to run -8 inlet -8 outlet, but I don't see any pump like that. Looks like there is either the -10 inlet/outlet, or the 18208 which has the -8inlet, -6outlet. Anyone had any experience? I know I need to move fuel with the e85, so maybe the -6 outlet isnt enough?

 

[camcclure]

yeah we run a prostarr 500 the big boy and its enough to fuel a 540 big block and a 400 shot of nitrous we tried a holly hp150 beofre the magnafuel which was said for up to above what were were running horsepower wise hit the top end of the track and the car just bogged aha but th magnafuel is amazing everything down to the fittings

 

[87GN_70GS]

I can only find one data point for the magnafuel pumps. The 525 pump (4302) is rated 1.2 gpm at 70 psi (which is 72 gph). Putting this point on the following chart http://www.turbobuick.com/forums/e85-technical-forum/280408-fuel-pump-injector-flow-graphs.html , the 72 gph at 70 psi point is slightly above the bosch 044 curve, and lies on the apexi curve. With no other data to go on, if you extend the bosch 044 line to the left to where it interescts the 85# injector at 25 psi curve, they intersect somewhere around 56-58 psi. 83# will be slightly to the right of the 85# curve so you may see 1-2 more psi. My estimated guess is that this combo (at 100% dc) will only see about 60 psi WOT.

Norbs, what is your base fuel psi? How much boost? What is your total psi at WOT? My guess is that your pump is not keeping up.

 

[1of1547]

I use an Aeromotive pump controller to keep the fuel cool as mentioned.

FWIW, Weldon only recommends their own fuel pumps controllers on their pumps. The Aeromotive and Weldon pumps slow the pumps down in different ways. The Aeromotive controller drops the voltage, were as the Weldon uses pulse width to control the pumps. More or a less it quickly turns the pump on and off to control the pressure. This is supposed to be easier on the pumps.

 

[DukeGN]

I'm only a noob, don't know that much, but I do actually have a magnfuel pump. First, thanks for the graphs, they have been great and really helpful. On the magnafuel pump, where did you get the 1.2 gpm at 70 psi, and is this at 12.5V? Wouldn't it flow more at 13V or 13.5V? Also, if you had a volt booster wouldn't it flow even more? I think the 525 is quite the work horse, and I'm just trying to figure out where it might fall on your graph -- I think you might be short-changing it a bit.

 

[norbs]

I did some flow testing and the pump does flow about 1.2 gpm at about 12.5 volts i had a battery charger on the car during the test. I installed a volt booster and reflowed the pump, its about 1.5 gpm with about 16.5 volts. My base psi is 43 psi, boost was about 18 psi-19 psi. MY friend watched my fp gauge under the hood and he said it came up and started dropping at high rpm during the dyno run. I may have enough fuel now.

 

[87GN_70GS]

I did some flow testing and the pump does flow about 1.2 gpm at about 12.5 volts

Was this at your regulators base fuel pressure of 43 psi?

 

[norbs]

Actually the flow test i used 75psi without the engine running

 

[dentmasters01]

putting a pro tuner 750 on my car with the staged motor.

I also have a weldon controller, new in the box, for sale if anyone is needing one.