Just run diesel in the fuel tank, make sure you've addressed all the normal maintenance, then go to a different shop.

A truck can fail simply because of the operator, and nothing more. If it passed last year, and you haven't had any issues with it since then, it should pass again.

Unless you've had some problems lately. If so, let me know and I can possibly help check out your truck for you.

 

It's near impossible for a diesel to fail the sniffer test here.
Out of 20% allowed opacity, my trucks register 0.0%.
One local guy failed and I told him to go to another test station and he passed fine.

Good luck.

 

ya i called and complained to the owner and he said he would test it, he is the one that has always done it but i am going to change my oil run a fresh tank of diesel and take down maybe some were else still i have not decided. i will let you guys know when i take it thanks for the help. This is crazy stuff since i have never had any problems and all i did all year was the fuel pump.