Vapor Lock on Ford 4000 gasoline 3 cylinder -- need gas cap

rams2050

New User
Hi!

I have come here several times previously and have always received the help that I've needed to solve various problems -- for which I want to thank forum members.

This time I am having problems -- of long standing -- with vapor lock while I am brush hogging in this unbelievably and unseasonably warm temperatures.

I went a while back to a Ford-New Holland dealer who told me I needed some kind of expensive fuel cap that would eliminate this problem. The price he quoted me -- and this was 5 or 6 years ago -- was something like $80. Try as I might, I cannot find this fuel cap anywhere online.

Can anyone help me and let me know where I might find one of these fuel caps that supposedly help to prevent vapor lock?

THANK YOU, ALL!!
 
(quoted from post at 12:15:55 10/09/17) Hi!

I have come here several times previously and have always received the help that I've needed to solve various problems -- for which I want to thank forum members.

This time I am having problems -- of long standing -- with vapor lock while I am brush hogging in this unbelievably and unseasonably warm temperatures.

I went a while back to a Ford-New Holland dealer who told me I needed some kind of expensive fuel cap that would eliminate this problem. The price he quoted me -- and this was 5 or 6 years ago -- was something like $80. Try as I might, I cannot find this fuel cap anywhere online.

Can anyone help me and let me know where I might find one of these fuel caps that supposedly help to prevent vapor lock?

THANK YOU, ALL!!
'm afraid that there is no cap for preventing vapor lock. Now if you have a non vented cap and this results in pulling a vacuum in the tank, you need a vented cap.....any vented cap that will fit the filler, or just drill a very small hole in your cap.
 
That fuel system should have a mechanical pump up on the front of the engine and, as such, vapor lock should not be an issue. As JMOR has said, if the gas cap is a non-vented cap or if the vent is clogged, the pump will eventually pull against a vacuum and the system will be starved for fuel, but it is not vapor lock. The easiest way to tell if the fuel cap vent is your problem is to simply loosen the cap when the tractor starts to have the problem. If it starts running properly again after loosening the cap then either the vent is clogged or the cap is not a vented cap. If loosening the cap does not help, then the cap vent is not the cause.
 

Thanks to all of you!

I will buy a vented cap and see what happens. As always, this is the best forum online anywhere to solve tractor issues.
 
Are you using unleaded gas or an ethanol gas, have seen a lot of problems using ethanol during hot weather.
 

Thanks a lot for the tip. I am using ethanol. I can't buy non-ethanol near our farm, I would have to take it with me from our home which is about 160 miles distant. The non-ethanol around here is 93 octane. Would that hurt the tractor?
 
Higher octane rating will not harm an engine. All that higher octane does is prevent pre-detonation (knocking) in higher performance engines. Contrary to what a lot of people think, higher octane itself does not increase performance. It just allows an engine to be tuned for higher performance without producing pre-detonation. You will be paying a higher price for something that you do not need though. If you think that the quality of the gasoline is deficient you can try an additive like sta-bil or Sea Foam.
 

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