The Stovebolt Site Forums The Shop Area Engine Shop 235 stalls out when it hot outside

I'm not sure if this should be here or in the engine section.

I have a '59 235 in my '50 1/2 ton, I rebuilt it several years ago, starting last summer when its in the upper 80's & 90's outside its like it runs out of gas every once in awhile, could it be because of it vapor locking? If it is, what do I need to do to correct it?

I'm not sure where to start looking for the problem, I have the heat riser adjusted so it never opens to heat the intake.

I have a Carter 964s carb on the original 216 intake & I do have a problem with it also, for some reason I can't open the air/fuel needle valve, it runs better with it closed. I'm open for suggestions.

It looks like your fuel line plumbing is in the normal locations. Vapor lock is most likely not your problem.

It sounds like you should start by checking out your carburetor.

Ask questions, be methodical, be patient. You'll figure this out.

I'm with Tim. It sounds like you have a couple of issues. 1st, I just rebuilt a carburetor,(per instructions),for a '58 viking 60 bus. The initial tune of the air/fuel needle valve,calls for turning it gently,until it "bottoms-out".Then it calls for the screw to be turned-out 1-1/2 turns. 2nd,I installed a set of "Fenton" headers on my '55 T.F. 6500,and it didn't run properly,until I purchased the "heat" kit. In you case,I'd re-adjust your heat-riser,so it does open,allowing the fuel to vaporize properly. To prevent vapor-lock on my truck,i have a wooden clothes pin clasped between the fuel filter,and the inlet tube on the carb. I haven't had a vapor-lock issue,yet. If these steps don't help,it may be time to re-build your carb. Kits are readily available,and the process is fairly simple. the main purpose is to get the inside of the body CLEAN,CLEAN,CLEAN!!I re built mine,and 2-weeks later,it acted like it was starved for gas! One small speck of debris,half the size of a pin-head,lodged between the accelerator pump body,and the check-ball beneath it. While you're at it,it would be a good idea to use compressed air,and blow-out all of your fuel lines.(From the tank to the pump,and from the pump to the carb.) This will help keep your fuel filter cleaner,for a longer period of time. Hope this helps.

I would try wetwilly.s advice first , if that fails May I ask you what degree thermostat you are using? A few years ago when I was running a 180 or a 195 degree thermostat, I had "Short of gas" symptoms, changed to a 160 degree and poof, problem gone. Jerry