VP Fuel T4+ - Bike Cut Out

Ehm24
Posts
124
Joined
12/9/2014
Location
San Diego, CA US
Fantasy

Hey guys, I unfortunately thought my batch was all good — but my bike cut out on a jump face. 

Something to consider: the pale was purchased last August. I made it through the whole can without problems, and then I mixed last 1/8 of it in with some 110 from Dion & Sons and that’s when my problem occurred.

My question is, do I need to replace the whole fuel pump, or would it suffice to simply replace the O-Rings? For reference, I’m just going off the main VP thread saying it expands the rings. 

Or even simpler, is it fine to dump the fuel and just run new gas? 

I’ll definitely inspect the pump no matter what — and when I do, would it be plain to see (to an untrained eye) that the o-rings are shot?


Bike: ‘24 350sxf

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Factor E
Posts
950
Joined
9/22/2011
Location
So Cal, CA US
4/22/2026 8:44pm

Replace filters an o rings   Clean injector

3
Ehm24
Posts
124
Joined
12/9/2014
Location
San Diego, CA US
Fantasy
4/23/2026 1:43pm
Factor E wrote:

Replace filters an o rings   Clean injector

Thank you!

neysbo
Posts
2008
Joined
4/1/2008
Location
Edelstein, IL US
5/6/2026 3:55am

Ran T4 plus toward end of last year, ended up leaving in tank over the winter. 
Decided to switch to ETS fuel for this year. Here is what is weird, bike ran fine for like first couple hours this year than suddenly started randomly cutting out but very sporadic.

Ended up putting in new fuel pump and been fine now. By the way it is a 24 KTM 250sxf and have to say the fuel pump swap was super easy.

1
wrc777
Posts
3157
Joined
5/21/2020
Location
Greenwood, IN US
Fantasy
5/6/2026 8:11am
neysbo wrote:
Ran T4 plus toward end of last year, ended up leaving in tank over the winter. Decided to switch to ETS fuel for this year. Here is...

Ran T4 plus toward end of last year, ended up leaving in tank over the winter. 
Decided to switch to ETS fuel for this year. Here is what is weird, bike ran fine for like first couple hours this year than suddenly started randomly cutting out but very sporadic.

Ended up putting in new fuel pump and been fine now. By the way it is a 24 KTM 250sxf and have to say the fuel pump swap was super easy.

There are bad batches of T4+ floating around. It causes issues with o-rings in the fuel pump on most bikes. Keefer gave the date codes in one of his podcasts I think. They fixed it late last year, but I can't remember which month going forward was good.

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