Fuel Pump Question

chriskent85 · 02-09-2016, 04:33 PM

I have a cart that Im running 110 octane and for some reason I have replaced the fuel pump on it 5 times in the past year. I only drive it out of my shop in the mornings and back in at night. I have used brand new briggs fuel pumps, aftermarket metal ones from ebay (probably cheap ones). They have all failed, I just ordered the only Billet aluminum one I could find. It is basically a Mikuni design. At least it uses the same rebuild kit. My question is that it has a dual outlet. Can I just cap off one outlet or should i run it back to the tank as a fuel return.

Dave in VA · 02-09-2016, 05:49 PM

Why 110 octane?

Is that for dual carbs?

1989Marathon · 02-09-2016, 06:56 PM

You can just plug one of the outlet ports off.

http://www.cps-parts.com/cps/pdf/Part53.pdf

I am also wondering why you are running 110 octane.

LVCJ · 02-09-2016, 07:06 PM

What about fuel pressure? Will you need a regulator of sort?

1989Marathon · 02-09-2016, 07:19 PM

Quote:

Originally Posted by LVCJ

What about fuel pressure? Will you need a regulator of sort?

No. As the link explains, it is nearly impossible for a pulse pump to deliver too much pressure.

LVCJ · 02-09-2016, 07:28 PM

Quote:

Originally Posted by 1989Marathon

No. As the link explains, it is nearly impossible for a pulse pump to deliver too much pressure.

Got it.

Should have read the link first...my bad. I was thinking of an electric pump versus a pulse type.

1989Marathon · 02-09-2016, 07:29 PM

Quote:

Originally Posted by LVCJ

Got it.

I was thinking of an electric pump versus a pulse type.

Correct. My supercharger runs fine with a pulse pump supplying 4-5psi to a carburetor.
My electric EFI pump puts out 140 psi. I have it regulated at 43psi to the injector, and a return line to the tank.

chriskent85 · 02-10-2016, 08:16 AM

Im running 12:1 compression, I know i can run a 110 and 93 mixture. I need around 103 octane to run properly. Im just too lazy to mix,

chriskent85 · 02-10-2016, 08:18 AM

could I run the 2 outlets together with a T fitting and run both to the carb, Will that put too much fuel in the carb. Im running the 2 barrel carb

raydhd · 02-10-2016, 09:21 AM

That would also work.In theory that would result in slightly less pressure due to the extra hose.

02-09-2016, 04:33 PM	#1
chriskent85 Gone Wild Join Date: Nov 2013 Posts: 706	Fuel Pump Question I have a cart that Im running 110 octane and for some reason I have replaced the fuel pump on it 5 times in the past year. I only drive it out of my shop in the mornings and back in at night. I have used brand new briggs fuel pumps, aftermarket metal ones from ebay (probably cheap ones). They have all failed, I just ordered the only Billet aluminum one I could find. It is basically a Mikuni design. At least it uses the same rebuild kit. My question is that it has a dual outlet. Can I just cap off one outlet or should i run it back to the tank as a fuel return.
chriskent85 Gone Wild Join Date: Nov 2013 Posts: 706

02-09-2016, 05:49 PM	#2
Dave in VA maintaining a low profile Join Date: Oct 2009 Location: SW Virginia USA Posts: 6,314	Re: Fuel Pump Question Why 110 octane? Is that for dual carbs?

02-09-2016, 06:56 PM	#3
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730	Re: Fuel Pump Question You can just plug one of the outlet ports off. http://www.cps-parts.com/cps/pdf/Part53.pdf I am also wondering why you are running 110 octane.
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730

02-09-2016, 07:06 PM	#4
LVCJ going,.. going,.. gone! Join Date: Apr 2014 Location: Third Rock from the Sun...Vegas baby! Posts: 1,422	Re: Fuel Pump Question What about fuel pressure? Will you need a regulator of sort?

02-10-2016, 08:16 AM	#8
chriskent85 Gone Wild Join Date: Nov 2013 Posts: 706	Re: Fuel Pump Question Im running 12:1 compression, I know i can run a 110 and 93 mixture. I need around 103 octane to run properly. Im just too lazy to mix,
chriskent85 Gone Wild Join Date: Nov 2013 Posts: 706

Today
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02-10-2016, 08:18 AM	#9
chriskent85 Gone Wild Join Date: Nov 2013 Posts: 706	Re: Fuel Pump Question could I run the 2 outlets together with a T fitting and run both to the carb, Will that put too much fuel in the carb. Im running the 2 barrel carb
chriskent85 Gone Wild Join Date: Nov 2013 Posts: 706

02-10-2016, 09:21 AM	#10
raydhd VC 460 CLONE GONE WILD Join Date: Oct 2014 Location: Ray BY The Bay NJ Posts: 10,633	Re: Fuel Pump Question That would also work.In theory that would result in slightly less pressure due to the extra hose.

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