Carb overheating help

BC Sunshine

BC Sunshine

Active Member
sendings a message into the wise Commer universe!

Heard back from the mechanic. Lots of fine tuning and road testing had it running nicely, but he found it has a huge problem with flooding when started hot.

He thinks the engine heat continues to transfer to the carb and the fuel is all percolating in there. It will start fine if it can sit for half an hour.

Anyone have similar problems and solutions?

He mentioned a heat shield?
 
We had a similar problem with a Ford Transit we hired in the hot summer of 1976. Rather than wait for it to cool down, we carried a bottle of water and poured it over the fuel line to cool it, enabling it to start. Not a long term solution, but it worked every time.
 
The inlet and exhaust manifolds are one piece so lots of heat transfers to the carb boiling the fuel.
 
Unfortunately Commers can be prone to fuel vaporisation. Try running the fuel line that runs from the pump to the carb in front of the radiator, then at least that bit will stay relatively cool and should help a bit.
 
I will let my overworked mechanic know!

It takes weeks to get in to see him at this point so I'm planning on showing up with the back full of parts and an a nice long list with all your suggestions. :D
 
Panky said:
Unfortunately Commers can be prone to fuel vaporisation. Try running the fuel line that runs from the pump to the carb in front of the radiator, then at least that bit will stay relatively cool and should help a bit.
Click to expand...
This exactly what I did on my old van when the fuel line collapsed:(, did the trick though :)
 
It could be someone's attempt at controlling the temperature in the engine bay but the manifolds are joined together anyway so a bit pointless really. Have you had any trouble with hot starts?
 
Hi. None but I haven't done any massive distance yet but i have started it ok when popping back from shops. It starts much better when warm
 
My Commer did the same. Stopping after a long run boils the fuel in the float reservoir because as you say there's heat soak - lots of heat with nowhere to go. Quite dangerous really as it allows the carb to expand enough to allow the press fit fuel inlet pipe to work loose.

Commeracer used to split and weld manifolds which should help overcome this as well as drop air intake temperatures. Wrapping and/or a heatshield would also help.
 
The intake part of the manifold is cut from the exhaust part and the resultant holes are plated over and welded up. I'm not too familiar with Martin's exhaust manifolds.
 
Ahhh. Thanks. I'm wondering how easy it would be to, when hole in manifold is plugged, wrap the exhaust bit without the intake bit?
 
Martins aren't joined, splitting the current one would allow wrapping them separately quite easily, done mine before Once split would defo help
 
Ahhh mine is cast. Not sure whether or not to bite bullet and just get new one or try to repair hole?
 
Definitely a hole. It's above the altinator as so has punched a hole in plastic casing of altinator. At the moment has manifold temp repair of b bean can bit and wire.
 
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