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Old 08-27-2010, 09:54 PM
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racing fuel system for 69 mustang

Guys,



I have a 69 mustang with a worked 302 that probably makes 350 horse and also has the 125 nitrous shot. I am planning on a motor upgrade at some point but my problem now is that my fuel pump seems to be dying. I have a gas tank sump and a holley blue pump. The last couple of weeks the pump quits when it gets hot. The gas tank is also leaking and the sending unit died a few years ago. I'm thinking about upgrading the fuel system and wanted to see if anyone has any suggestions. I know many of the new cars have fuel pumps that are actually in the tank. Is there a racing tank out their with a built in fuel pump that is a bolt in application for the 69 mustang? Another option I guess is I could gut the tank and install a fuel sump in its place. Has anyone here done that? Any advice would be appreciated.



Mike

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Old 08-27-2010, 10:09 PM
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Not suprised you want to get away from the Holley blue pump.

A carter P4594 with 3/8" fuel line and common $10 3/8" in out paper fuel filter will feed your motor all day long with room to spare. No regulator is required for the carb.
These pumps are very reliable. They are one of the few pumps actually intended for full time street use.

For the nitrous side, for absolute reliability and safely and max performance.
Use a twin separate identical system for the nitrous but add a Holley fuel pressure regulator and a good gauge to regulate the fuel pressure to 5psi to 5.75PSi running/flowing.

When properly rubber isolated mounted these pumps are quieter than the Holley blue and a lot more reliable.

Think about mounting a separate small nitrous dedicated fuel cell under hood with the 2nd pump for the nitrous. You can then run the nitrous side on 110 octane race gas at reasonable cost.
Allows a much more powerfull shot with full reliability.

Here is a tip: When you redue the fuel pick up tube in the tank, flair/bell mouth the end of the tube to maximize fuel flow into the tube.
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Old 08-29-2010, 02:00 PM
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Thanks for the advice. I already have 1/2" line and a fuel sump in the tank. The fuel sump line goes to a Russell race filter and then to the Holley blue pump, then 1/2" line up to the Moroso cool can and then splits after the can with a feed going to the nitrous solenoid and another to the regulator then carb. I need to replace the tank because it is leaking and now I also need to replace the pump. Since I have to work on the whole system, I was wondering if anybody has any info on fuel cells or replacement tanks with in tank pumps. I'm interested in cutting down on the pump noise if possible. I already have the new tank and a comp eng. fuel sump that I can weld onto it, but I wanted to know if anyone knew of a better option. I hear alot about these newer cars having in tank pumps and I"m wondering if they are a lot quiter. If anyone knows of a standard electric pump that could replace the Holley blue and run quiter that would be great. The current combo is not that demanding but I'm going to upgrade this motor one day and only want to do this fuel system once.

Thanks for any info.
Mike
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Old 08-29-2010, 02:16 PM
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Mallory Comp pumps, and Holleys HP pumps are both gearotor design pumps instead of vane pumps like the Holley original design. Both are much quieter.
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Old 08-29-2010, 02:17 PM
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You'll find all in tank style pumps have too much pressure and not enough volume. They are all for EFI not carbs. You do not need to sump the tank on your car. Its not a prostock.
Just need to properly located pickup tube.
Your external pump is noisy cause its not mounted right. Hang it on rubber, like a muffler. Isolate the steel hard lines from the pump with connecting rubber hoses to stop the vibration transfer. The holley blue is the loudest pump. The Carter is a lot quieter. Especially when correctly mounted.
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Old 08-29-2010, 03:41 PM
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How bout a drop sump style fuel cell in the truck with an electric pump under the car.
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Old 08-29-2010, 04:44 PM
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This is the muffler hanging rubber I've always used to mount electric fuel pumps. Also, use a short piece of non-metallic hose coming into and out of the pump to further isolate vibes. She'll be quiet as a church mouse.
http://www.spintechmufflers.com/imag...THANGERKIT.jpg
I don't know if they still carry it, but I used to buy it in 6 inch lengths at Pep Boys.
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Old 08-29-2010, 06:13 PM
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I need a clarification. Do I use the muffler rubber to insulate the pump and bolt it in between the pump and frame, or do I actually hang the pump like a muffler and let it swing in the breeze? Also, do I actually use regular rubber gas line with nipple fittings going into and out of the pump to minimize the noise, or can I use steel braided line at this point?

Mike

Last edited by mike69; 08-29-2010 at 06:39 PM.
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