1985 250es tank vacuum?

[Patmc]

I have a 1985 250es that will run for a while and then carb stops getting fuel. Could a bad fuel cap cause a vacuum? I am not sure if it is the petcock that is stopping it or a vacuum in tank. Any advise would be appreciated.

[erectordale]

If the tank cap is plugged or not in the on position it will starve the carb of fuel I've bought 2 250es that was all that was wrong with them

[Patmc]

Thanks for the advice. I will swap the cap off my 4 wheeler and see what happens.

[UFLBret]

that was the issue w/ one of my '84 200ES. There's a great vid on youtube somewhere of how the cap comes apart so you can clean it all up. Worked like a charm.

[tri again]

I have a 1985 250es that will run for a while and then carb stops getting fuel. Could a bad fuel cap cause a vacuum? I am not sure if it is the petcock that is stopping it or a vacuum in tank. Any advise would be appreciated.

90% chance it's the cap. Some ppl drill a tiny hole. Not sure if soaking helps but they corrode internally.
I'd Love to see how to fix them.
Also ez to clean the petcock and screen.
Kinda like a sediment bowl that unscrews.

[Patmc]

That was it. Watched the video on youtube. Took me 10 min. Thanks for help.

[tri again]

That was it. Watched the video on youtube. Took me 10 min. Thanks for help.

any chance of posting the link or telling what key words you used for the youtube fix?
Thanks and congrats

[Bren_downe]

any chance of posting the link or telling what key words you used for the youtube fix?
Thanks and congrats

X2… inquiring minds need to know!

[muthey]

here you go
https://www.youtube.com/watch?v=kD3p_phidwM

[muthey]

and another
https://www.youtube.com/watch?v=Ljc5H1ZB7vM