BG 400 fuel pump on 16volts?

Bracket Talk

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March 19, 2024, 08:37 PM

Dragn

BG 400 fuel pump on 16volts?

Can I run a BG 400 fuel pump on 16 volts with out hurting it?

March 20, 2024, 08:24 AM

CAD

quote:
BG 400 fuel pump on 16 volts

https://www.smileysracing.com/...oads/get.aspx?i=8831

According to this, it is an option.

March 20, 2024, 09:24 AM

CURTIS REED

I can't imagine how much my Magnafuel pump would put out on 16v. It's pretty stout on 12.

March 20, 2024, 09:35 AM

diceman1530

I would definitely run a by pass regulator it will eat itself up with a dead head regulator

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March 20, 2024, 09:45 AM

329L

quote:
Originally posted by diceman1530:
I would definitely run a by pass regulator it will eat itself up with a dead head regulator

The Barry Grant has a bypass regulator built on the pump. I would however use the largest regulator possible at the carb

March 20, 2024, 10:30 AM

TOP38

For any electric pump when going to a 16v system, re-adjust the pump by-pass pressure! For Magnafuel pumps, they also offer a lower pressure by-pass spring for this application! As long as you can reset the by-pass pressure down to 18 to 21 psi your good to go with no other mods. Typically you want about 3 times the pressure that the carb sees.

I know of a number of racers running 16v systems with a dead head regulator with no issues.

March 20, 2024, 11:33 AM

Big Steve

My new truck I built has a Magnafuel 500 with a dead head regulator on 16 volts. The lowest I could get the pump bypass regulator was 24 psi and was told that was fine. I didnt know they had a different spring available

March 20, 2024, 12:35 PM

TOP38

quote:
Originally posted by Big Steve:
My new truck I built has a Magnafuel 500 with a dead head regulator on 16 volts. The lowest I could get the pump bypass regulator was 24 psi and was told that was fine. I didnt know they had a different spring available

I'd say 24 is OK too but if you want to try their light spring it's MP-8050-04.

March 20, 2024, 12:52 PM

CURTIS REED

Thanks for the info Top. I had no idea about their low pressure spring either.

March 20, 2024, 09:25 PM

Big Steve

Thanks Top, Summit has it in stock at my Arlington Tx warehouse, $8.25. I will stop by and get it

March 21, 2024, 09:06 AM

TOP38

quote:
Originally posted by Big Steve:
Thanks Top, Summit has it in stock at my Arlington Tx warehouse, $8.25. I will stop by and get it

Now if I could only get you to try MT's.

Sorry, couldn't resist!

Let us know how it works.

March 21, 2024, 09:50 AM

Big Steve

quote:
Originally posted by TOP38:
quote:
Originally posted by Big Steve:
Thanks Top, Summit has it in stock at my Arlington Tx warehouse, $8.25. I will stop by and get it

Now if I could only get you to try MT's.

Sorry, couldn't resist!

Let us know how it works.

Now thats hilarious

March 21, 2024, 10:04 AM

ski_dwn_it

I went to a magnafuel 500 on 16v and had nothing but troubles. Spent a small fortune on regulators and -12 lines at the advice of Aeromotive and MF. Nobody could figure it out. Had a 500 dollar new to market regulator from MF and it still wouldn't regulate properly thru a run.

12v it was fine.

Went to belt driven pump this winter.

I would avoid 16v with electric pump.

March 30, 2024, 05:09 PM

Big Steve

Installed the lighter bypass regulator spring today that Top38 recommended. It had a standard spring that was cut down in it.
With the lighter spring at the same setting pressure was still 24lbs, if I backed the regulator off much more then it would start to leak thru the threads.
Cut the lighter spring down a few coils and was able to get the pressure down to 21lbs, that was lowest I could get it.
I got the new converter installed and will go test next week

March 31, 2024, 06:27 AM

Curly1

quote:
Originally posted by diceman1530:
I would definitely run a by pass regulator it will eat itself up with a dead head regulator

Definitely always run return style regulator even if pump has a bypass.

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March 31, 2024, 07:23 AM

Wooley

Steve, on that pump according to a guy I talked to on the tech line. If the light spring still makes too much pressure, remove the hose and bypass fitting from the pump. The place where the bypass hose attaches, enlarge the hole in the fitting a little. Iirc it’s 3/8 so ream it to 7/16. That will lower the pressure because it allows a greater volume of bypass.

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March 31, 2024, 04:54 PM

rusty

quote:
Barry Grant said you could not…

so you can only run it on 16 volts