Products to Compare (max of 3)
X
Compare These Parts
Talk to the Experts. Call 800.979.0122, 7am-10pm, everyday.
Customer Service
Since 1952
in
in
  • Expert Tech Support
  • Huge Inventory
  • Fast Shipping

Fuel Expansion Issues

By John
1 year 7 months 16 days ago

In this Tech Tip, John offers up a couple solutions to a somewhat common problem of fuel expansion on the older vehicles.

“I recently purchased your Two Plain 9 Super 7 Carbs, Offenhauser 1075 Dual Intake, 49-53 Ford V8. This kit has been installed on my 1950 Ford Coupe. Although the automobiles performance has been greatly improved I do have an issue. About 2 to 3 minutes after shut down fuel begins leaking from the throttle shaft of both carbs. I've recently added an Offenhauser Fuel Pressure Regulator which is currently set to 2.5psi (after starting out at 3psi) and still it leaks.  Any suggestions as to what I might try?”

Hi, thanks for the question. You inquired about the carbs leaking out the throttle shaft a few minutes after shut down. It sounds like the fuel is expanding and flooding over into the throttle bore.  This would be the first thing to check by making sure the float levels are correct.  The other thing that could be checked is the heat range of the carb and if need be you could install one or more of the phenolic spacers P/N 91011615.  Fuel pressure can be cut down to 2psi or slightly lower. Feel free to visit us on the web at www.speedwaymotors.com or call 1-800-979-0122 with questions or to place an order.

  • John W.

Products Featured in this Article

Related Articles

Winterizing Your Fuel System
by Frank G. - Posted in Tech
3 months 21 days ago
The process on how to effectively winterize your fuel system in open wheel racing. This includes step by step instructions and recommended parts to use for your fuel system.
Learn More
'57 Bel Air Fuel Pump
by Jeff K. - Posted in Tech
3 months 8 days ago
The process of changing out a mechanical fuel pump in a 1957 Bel Air and some helpful tips while doing so.
Learn More
Red Ram Revival Part Two
by Tim - Posted in Tech
1 year 10 months 13 days ago
Speedway Motors employee Tim M. Decided to take us along as he revives his 241 "Baby Hemi". In this installment, Tim helps his project breathe a bit better with and Edmunds 2x2 intake, topped with a pair of Speedway Motors' own "9 Super 7" carbs.
Learn More
How To Set Up Multiple Carburetors on a Vintage Engine
by Jason - Posted in Tech
1 year 7 months 10 days ago
There's a right and wrong way to run a two-barrel carburetor on your vintage engine. Check out this guide about how to select the correct carburetor for your Flathead or vintage engine.
Learn More
Troubleshooting a Fuel Gauge
by Speedway Tech Team - Posted in Tech
1 year 8 months 11 days ago
Troubleshooting a fuel gauge can be a seriously aggravating issue. Click here for a video showing some hints and tips!
Learn More
Plumbing Your Dual Feed Holley Caburetor
by Zach R. - Posted in Tech
6 months 7 days ago
Learn how-to plumb your dual feed Holley Carburetor.
Learn More
Fuel System Overview
by Speedway Tech Team - Posted in Tech
1 year 8 months 10 days ago
Thinking about rebuilding your fuel system but you're not sure what it entails? Click here for a comprehensive article on what to expect!
Learn More
Is a washable filter worth it?
by Speedway Tech Team - Posted in Tech
1 year 8 months 10 days ago
Unsure if your washable filter is worth the cost? Click here to find out!
Learn More
The Flathead Vapor Lock
by John - Posted in Tech Tips
1 year 7 months 26 days ago
In this Tech Tip, John makes a few suggestions on how to deal with the classic problem of a Flathead Ford, vapor-lock.
Learn More
Keep Your Sprint Car Engine Running at Peak Performance
by Dalton J. - Posted in Tech
2 months 3 days ago
One of the most important parts of your racing operation is the engine. This article gives a detailed overview on how to maintain your engine to get the most out of it for as long as possible. Also learn some tips to prolong the life of your engine.
Learn More
Suggestions
Error
Note
Ok