Engine will not start when hot
Thread Starter
2nd Gear
Joined: Nov 2007
Posts: 2
Likes: 0
Engine will not start when hot
I have a 74 with a 350 in it , It has a Fireball cam , 600 Holley , The cooling side is taken care of by two Kenlowe fans mounted between the nose and the radiator sucking the air out from the Rad these trip in at at around 180 and seem to keep the temperature on the guage constant. It has no other fans.
The problem is ,If I run the car for twenty miles or more then stop and turn the engine off , then try to start it again it will not start , the engine will turn over and If I pump the gas it will eventually splutter but not start, but just flatten the battery,
This is an inherited problem as I have owned the car for a couple of years but only just finished working on it to get it on the road and discoverd this on the first few runs.
I know you get heat sink on the starter but can you also get it on the carb, I've heard of adaptor plates being used to lift the carb off the mani just to help with heat problem.
Any help will be appreciated , John
The problem is ,If I run the car for twenty miles or more then stop and turn the engine off , then try to start it again it will not start , the engine will turn over and If I pump the gas it will eventually splutter but not start, but just flatten the battery,
This is an inherited problem as I have owned the car for a couple of years but only just finished working on it to get it on the road and discoverd this on the first few runs.
I know you get heat sink on the starter but can you also get it on the carb, I've heard of adaptor plates being used to lift the carb off the mani just to help with heat problem.
Any help will be appreciated , John
Intermediate
Joined: Dec 2005
Posts: 40
Likes: 0
From: Las Vegas Nv.
If the car is turning over, it's not a starter proplem.
I would try shuting down the choke.
Sometimes the elec choke will come on even at running temp.
If it's adjusted real rich, you could be flooding the engine.
I would try shuting down the choke.
Sometimes the elec choke will come on even at running temp.
If it's adjusted real rich, you could be flooding the engine.
Thread Starter
2nd Gear
Joined: Nov 2007
Posts: 2
Likes: 0
I dont have the choke hooked up, it starts fine in the cold without it, the electric side could be a possibility but I still think its a carburation problem, but on the other hand usually its what you don't think it is so I'll have a play with the electrics, thanks for the help.
Racer
Joined: Mar 2006
Posts: 276
Likes: 1
From: Pistoia PT (ITALY)
Vapour lock !
The gas in your carburetor start to boil when you stop the car (thermal collapse) and even tha gas line will boil.
The net result is a fuel pump empty of gas and full of vapour.......
A solution (I did it on my old engine..) can be a "T" fitting in the fuel line to the carb with a very small purge hole (around 0.050") wich you can re-direct to the return gas line.
The flow capacity of the pump will not be affected by that..... but from a small hole a lot of vapuor can be purged!!!!
The gas in your carburetor start to boil when you stop the car (thermal collapse) and even tha gas line will boil.
The net result is a fuel pump empty of gas and full of vapour.......
A solution (I did it on my old engine..) can be a "T" fitting in the fuel line to the carb with a very small purge hole (around 0.050") wich you can re-direct to the return gas line.
The flow capacity of the pump will not be affected by that..... but from a small hole a lot of vapuor can be purged!!!!
Melting Slicks
Joined: Jan 2003
Posts: 2,713
Likes: 31
From: Shreveport LA
LA Events Coordinator
Vapour lock !
The gas in your carburetor start to boil when you stop the car (thermal collapse) and even tha gas line will boil.
The net result is a fuel pump empty of gas and full of vapour.......
A solution (I did it on my old engine..) can be a "T" fitting in the fuel line to the carb with a very small purge hole (around 0.050") wich you can re-direct to the return gas line.
The flow capacity of the pump will not be affected by that..... but from a small hole a lot of vapuor can be purged!!!!
The gas in your carburetor start to boil when you stop the car (thermal collapse) and even tha gas line will boil.
The net result is a fuel pump empty of gas and full of vapour.......
A solution (I did it on my old engine..) can be a "T" fitting in the fuel line to the carb with a very small purge hole (around 0.050") wich you can re-direct to the return gas line.
The flow capacity of the pump will not be affected by that..... but from a small hole a lot of vapuor can be purged!!!!
Also make sure the fuel line isn't touching, leaning (or is very close) against an exhaust pipe or headers. When I was youngin, I had a VW Beetle and it did the VERY same thing until I realized the fuel line was resting against the exhaust manifold. It's an easy thing to have done especially with the limited amount of space in the engine compartment.Good Luck!
