47 Flathead carburater woes

[modelamodela]

Have a 47 flathead running on a Holley 2100 with a Purolater electric fuel pump and a flow meter set at 2.5. Starts up easily, runs and drives for 10 minutes, then looses power and stops. With effort, it will restart but stops again. After waiting an hour or so, will start up fine, run another 10 minutes or so, then stops again. Feels like fuel starvation, but hey, what do I know !!! What is the problem??

 

[ken ct]

Either a faulty pump,clogged fuel filter some where OR coil problems,Take your pick ken ct.

 

[Walt Dupont--Me.]

The next time it does that when the engine is hot, pull a couple of plug wires and hold the wire about 1/4in. from ground, like the head, and have someone crank the engine and see if any spark. It sounds like bad coil. You could send that 46-7-8 coil to Ship Hanney in Fl. and have rewound, you'll never have a hot starting problem again. Walt

 

[Willit Stop]

If it was me,I would run it until it stops,then pour a LITTLE splash of gas in the carb. If it starts right up....it's a fuel problem. Good luck.

 

[randymo9]

just had same issue with my 46 coupe flathead. coil replacement with modern style coil and has run well since randy

 

[flatjack9]

Condensor?

 

[Dick's Hot Rod Place]

Unscrew your gas cap and see if that don't cure the issue.

 

[JWL]

Some good suggestions already here---
First, when it begins to stop, add some fuel and observe the response. Sometimes pulling the choke can give a clue. Next, check for spark. If spark is weak or intermitent the first change should be the condensor.

 

[Bruce Lancaster]

The typical coil failure will behave like what you describe...when I first encountered it as a teenager I failed to diagnose it because it would always produce a spark even while still hot. I eventually learned that what I saw, a thin yellowish spark, was the indicator, and that the satisfactory spark produced when the coil was still cold was fat and blue with a satisfying SNAP to it.

 

[Kerk]

I was with a group coming back from a Georgia meet and a 46 in the group KEPT HAVING "vapor lock". After 3 or 4 stops I said we should change the coil! I had the modern type which we Micky Moused the wiring and laid the coil on the Intake and drove the rest of the way home with no more problems. Just my experience for what it is worth. I always carry a spare coil and condensers.