56 vaper lock
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5th Wheeling
Joined: Jan 2011
Posts: 34
Likes: 1
From: pa
56 vaper lock
My 56 f600 starts right up,but once it get hot and shut it off it won’t restart until I leave it sit for a while.I have wrap heat insulation around the fuel line.Am going to replace the rubber tubing that runs from tank to fuel pump with copper tubing.I was told that todays gas is not that friendly with these older engines.Is there any additive you can add?Looking for any help,love driving the truck.
Fleet Owner
Joined: Dec 2000
Posts: 25,407
Likes: 5,417
From: Central PA
I don't think that is vapor lock, especially if you have put insulation around the fuel line going to the carb. Your starter may be getting hot and I ter als are expanding. I had the same problem several years ago. Someone said maybe I need new battery and starter cab!es. I said, "No. I had new 00 cables made ones made when I fixed up my truck." Then I realized I had them made 18 years ago. I got new ones made and the truck started right up when hot. The new cables allowed more power to get to the starter and spin it. I cut open the old cables and they were corroded inside.
And I don't think you should use copper tubing for your gas line. You can buy preformed fuel line for your truck. I got mine from a seller on ebay.
And I don't think you should use copper tubing for your gas line. You can buy preformed fuel line for your truck. I got mine from a seller on ebay.
Lead Driver
Joined: Jun 2021
Posts: 5,221
Likes: 805
I don't think that is vapor lock, especially if you have put insulation around the fuel line going to the carb. Your starter may be getting hot and I ter als are expanding. I had the same problem several years ago. Someone said maybe I need new battery and starter cab!es. I said, "No. I had new 00 cables made ones made when I fixed up my truck." Then I realized I had them made 18 years ago. I got new ones made and the truck started right up when hot. The new cables allowed more power to get to the starter and spin it. I cut open the old cables and they were corroded inside.
And I don't think you should use copper tubing for your gas line. You can buy preformed fuel line for your truck. I got mine from a seller on ebay.
And I don't think you should use copper tubing for your gas line. You can buy preformed fuel line for your truck. I got mine from a seller on ebay.
get a 3 port fuel filter and make or find a sender for the tank that can take a vapor return , or a fuel return fuel pump possibly. electric pumps, if you can find one for 6v I guess, also help with that. Also insulating the gas lines from heat anyway possible will helpl a lot.
FTE Legend
Joined: Nov 2015
Posts: 30,939
Likes: 4,124
From: Angier, NC
It could be the battery cables and to find out run a voltage drop test on them.
But if you have to crank it a lot and hold the throttle wide open for it to start it is the fuel.
What happens is the 10% gas we get today boils easier and when you turn the motor off the carb now gets heat soak and the gas in the bowl boils.
When this happens the fuel vapors being heavier than air goes into the intake manifold flooding the motor.
The fix is keep the carb as cool as you can.
Adding a non-metal spacer between carb and intake helps.
If you have exhaust cross overs in the intake plug them off.
Can try non 10% fuel if you can but some states you can't get it.
It has also been posted but I have not tried is add a little diesel fuel to the tank of gas. This changes the carbon count of the gas and said to help on hot restarts.
Again I have not tried it.
Dave ----
But if you have to crank it a lot and hold the throttle wide open for it to start it is the fuel.
What happens is the 10% gas we get today boils easier and when you turn the motor off the carb now gets heat soak and the gas in the bowl boils.
When this happens the fuel vapors being heavier than air goes into the intake manifold flooding the motor.
The fix is keep the carb as cool as you can.
Adding a non-metal spacer between carb and intake helps.
If you have exhaust cross overs in the intake plug them off.
Can try non 10% fuel if you can but some states you can't get it.
It has also been posted but I have not tried is add a little diesel fuel to the tank of gas. This changes the carbon count of the gas and said to help on hot restarts.
Again I have not tried it.
Dave ----
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