The ever illusive 1/2 tank lean issue is no more…at least with my Savage X. I did put a Werks Dual Chamber Exhaust Pipe on there, but it seemed to do very little for the problem.
What is the half tank lean issue - When you fill your fuel tank and your motor is then running too rich, enough to where you have to lean it out every time you fill the tank, that’s one indicator that you are having the 1/2 tank lean issue. Alternately, when you run the tank past the halfway mark down, you have to richen UP the high speed needle because it is then running too LEAN. There are several theories on why this “half tank lean issue” happens including:
“The shelf in a fuel tank that has a ’shelf’ causes a sudden drop in volume or pressure (somehow?!)” Once the fuel goes empty past that shelf in your tank (a horizontal shelf), there is evidently a change in pressure to the fuel line and the carb.
“The exhaust pipe type can cause this”. On my truck, personally, going from an HPI Ribbed Pipe to a Werks 2 chamber pipe did not change the 1/2 tank lean issue much. BUT, I do think, from what I gather, that the dual chamber pipe can have an effect on the consistency of pressure to the pressure line, fuel tank, and carb.
“A header tank will cure this”. Well, I have one of these tiny little tanks hanging on my pegboard in my garage and have yet to use it…I don’t think I need it! The New Era Tank seems to have worked for me.
and many many more tales of cures to fix this ghost of a problem…
What I think is that every truck becomes unique (when you modify this and modify that) - and every truck is going to act differently - also depending upon your location, temperature, etc.
This may work for you, it may not - but at ~$23 for the tank you’ll need and $3 for some velcro, it’s worth a try right!?
Here’s the Complete Writeup on How to Fix the Half 1/2 Tank Lean Issue
, but as far as winning a race against Revos, I have my doubts! Unless it’s legal in the Roar Rulebook to force your competition into a wall hehee (just kidding)
