Hello, new here with question

[CrazyIvan]

Hi, I just found this site, read through it a bit and found it to be awesome!

I have a 1972 Mach 1 Mustang with a 4bl 351C, 650 Edelbroch carb, Holly headers and Flowmaster Dual exhaust.

I am having a problem and thus my question. The car starts cold just fine, starts right away. But, if I drive around for a while, get the engine heated up and then park, say for between 15 minutes and 3 hours, then go back to start it, it doesn't like to start, I have to pump the gas and it takes 10-20 seconds to fire.

Is this a timing problem, carb problem or what? I can't figure it out.

Thanks for any info you can offer.

Here's some pics of 'er:

http://www.geocities.com/banzaibrothers2002/Mach1/

 

[Nemesis67]

Sounds like the fuel in your carb basically evaporated out of it. Your carb is getting too hot and therefore the fuel gets evaporated. Could be a fuel pump, but most likely not. Try a carb spacer between your intake and carb, either aluminum or a phenolic (high temp plastic). I've even seen people use wood!

 

[Decurion]

Wood is actually an excellent insulator, whether or not it can hold up to the demands, well, Ive seen a few commercially available made from either wood, or laminated wood, so Id have to say it works pretty well. Try that and see what happens. I have the same problem with my truck, its just that nobody makes a spacer for a one barrel that I know of.

 

[Nemesis67]

Wood is actually an excellent insulator, whether or not it can hold up to the demands, well, Ive seen a few commercially available made from either wood, or laminated wood, so Id have to say it works pretty well. Try that and see what happens. I have the same problem with my truck, its just that nobody makes a spacer for a one barrel that I know of.

Well then, I guess you could make your own spacer out of wood. That way the spacer fits your application and at the same time you can tell us all about how well it it works and how well it holds up.

 

[mfp4073]

I was leaning that way too, but some of the more skilled may come in and suggest something different. The gas evaporating away may be an indication of something else wrong (like the engine running hotter than it should).

and here is a couple of things...WELCOME TO STANGNET!

Nice looking car!

And so everyone can see it in the thread:

 

[CrazyIvan]

I talked to the local mustang shop. Pretty much confirmed what some have said here.

They said because I have a performance motor, it is a pretty common issue with these. When you turn off the car, the gas slowly bubbles (boils) up into the carb then when you go to start it, there isn't enough air-flow into the engine to overcome it, so it takes a little bit to circulate the air back into the cylinders. He said the best thing to do is to push the pedal down immediately before turning the key about 1/4 to 1/2 the way down. He also gave the option of adding a spacer like you guys have suggested here.

He said if you start it shortly after turning it off, the gas does not have enough time to bubble up into the carb and that is why it starts fine. He said not to pump the gas because it can easily flood when this happens.

Anyhow, thanks for the feedback. I have had this car since 2003, the new engine was put in it about 6k miles ago. It is the first performance motor I have had. It has the aluminum head, racing cam & lifters, all that good stuff.

Thanks for posting the pic. I tried, but it said the files were too big. Some of the pics on the lower part of that link I gave are better resolution. Those foggy ones were taken with a cell phone.