Help is just a click away!
Click here to chat with a Speedway Team Member
💬
Online - Chat with us!
Chat
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
Talk to the Experts. Call 800.979.0122
Shop By
Support
Account
Street Race Truck More... The Toolbox

The Flathead Vapor Lock

9/27/2016

In this Tech Tip, John makes a few suggestions on how to deal with the classic problem of a Flathead Ford, vapor-lock.

Flathead Ford won't run when it's warm

“Hi, I own a ‘51 Ford convertible that I cannot get to run in warm weather. The fuel system shuts down what is your fix for this problem? Fuel pump? Carb? Frustrated owner here, thanks for any help.”

  • Jim

Hi Jim, Your question brings up the age old problem of keeping the Flathead Fords running in warm weather. The Flatheads were notorious for vapor-locking. Unfortunately, the warmer it gets the worse it gets. The old trick of clothes pins on the fuel line and aluminum foil over the line always doesn’t help. Vapor lock and boiling fuel is normally the culprit. First you need to check fuel flow to make sure everything is flowing freely in the fuel lines. If not, make the changes to correct those problems. If you have 6 volt pump you can look at P/N 9104259, or a newer mechanical pump will insure flow. Keep in mind the ‘51 mechanical pump has two possibilities for the pump fittings. A regulator such as 56058500 is always recommended with electric pumps. If your mechanical pump appears to be working, maybe a helper pump is needed. In that case we offer P/N 465810400 in 12 volt and this requires no regulator. Carb spacers help such as P/N 91011615 and sometimes customers will use 2 per carb. Thermal sleeve is available under P/N 70414030 and others. Relocating the fuel line so not to be close to the exhaust is another good idea.  Run regular gas without ethanol and avoid the blended fuels. 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

'57 Bel Air Fuel Pump
by Jeff Karls - Posted in Tech
2/12/2018
The process of changing out a mechanical fuel pump in a 1957 Bel Air and some helpful tips while doing so.
Winterizing Your Fuel System
by Frank Galusha - Posted in Tech
1/30/2018
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.
Fuel System Overview
by Speedway Tech Team - Posted in Tech
9/13/2016
Thinking about rebuilding your fuel system but you're not sure what it entails? Click here for a comprehensive article on what to expect!
Is a washable filter worth it?
by Speedway Tech Team - Posted in Tech
9/13/2016
Unsure if your washable filter is worth the cost? Click here to find out!
Designing Your Fuel System
by Jason Lubken - Posted in Tech
9/13/2016
Fuel System Performance
Red Ram Revival Part Two
by Tim Matthews - Posted in Tech
7/12/2016
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.
Fuel Expansion Issues
by John Wulbern - Posted in Tech Tips
10/7/2016
In this Tech Tip, John offers up a couple solutions to a somewhat common problem of fuel expansion on the older vehicles.
Selecting An Electric Fuel Pump Over Mechanical
by Matthew McClure - Posted in Tech
3/6/2018
For most, an electric fuel pump can be a choice of form over function, but for others, it may be the best option. In this article, you will learn the advantages of using an electric fuel pump and how to install it in your car.
How To Set Up Multiple Carburetors on a Vintage Engine
by Jason Lubken - Posted in Tech
10/13/2016
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.
Keep Your Sprint Car Engine Running at Peak Performance
by Dalton Johnson - Posted in Tech
3/19/2018
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.
Suggestions
Error
Note
Ok