Need Help Choosing Electrical Fuel Pump.

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Oct 11, 2007 | 09:17 AM

Bill Z

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Instructor

Joined: Apr 2006

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From: Spring Texas

Need Help Choosing Electrical Fuel Pump.

I installed a 500 horse SB 400 with a double pumpper Holley carburetor in my 71 rag top. When I get on it, it does great through first, second and falls on it’s face around 2300 RPM in third. Just after it falls and I back off the gas, it still has issues recovering for about 30 seconds. I figure the stock mechanical fuel pump isn’t delivering enough gas to keep the bowls full at WOT.

I would like some opinions on brand and model of an in line electric fuel pump that will give me the volume but won’t over drive the floats in the carb.

Please help.

Oct 11, 2007 | 09:25 AM

63mako

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From: Millington Illinois

St. Jude Donor '08-'09

Quote:

Originally Posted by Bill Z

Stock fuel pumps feed L88 engines. They require a lot more fuel than you need. I would look somewhere else for your problem. Dirty filter, Float set too low, Weak stock pump, Obstruction in the tank. I went with a 130 GPH Mechanical and a regulator.

Oct 11, 2007 | 10:00 AM

Matt Gruber

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From: central FL, near the beach.

Holley 12-125 110gph at 7psi no reg req.

Oct 11, 2007 | 10:18 AM

Bill Z

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Instructor

Joined: Apr 2006

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From: Spring Texas

Quote:

Originally Posted by 63mako

I guess I can put a pressure gauge on the fuel line just to see what pressure I'm getting. But I did install a brand new pump and filter with the engine. Of course, just because it is new, doesn't mean that works 100%.

I'll check the fuel volume of this mechanical pump with the electric pumps that are suggested. For some reason, I'm thinking I will get better long term service from the right electrical pump but right now, I'm still open.

Oct 11, 2007 | 10:34 AM

dk-corvette

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You can put on such a fuel pressure gauge and follow how it goes with your pressure while you are driving. Just put the sender on your fuel line and run the wires into the cabine.

http://store.summitracing.com/partde...5&autoview=sku

I'm planing to build such one on my car in the near future, and have it replace the original clock.

Best regards, DK.

Oct 11, 2007 | 11:12 AM

68/70Vette

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From: Redondo Beach, California

I bought an Aeromotive pump (the "Street and Strip" pump. Also I bought their speed controller for the pump. It uses the tach signal from an HEI distributor (It will also work with a MSD ignition system) to vary the speed of the pump. It only works full speed above 3000 rpm (I think you can change the full speed setting). It produces about 14 psi and needs a regulator at the carb. Seems like a good system. Haven't tried it out under full power yet.

Oct 11, 2007 | 02:50 PM

capevettes

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The stock fuel lines may be too narrow to carry the amount of fuel your 500 hp motor is calling for. I would also look at your float bowl levels. NO need for an electric fuel pump for 500 horses.