I bought 2 gallons of racing fuel (110) and then put 2 more gallons of 91 octane and mixed in my oil. I was not sure if this would hurt my Engine So I diluted 50/50. I only topped off my tank with one gallon and rode 20 miles in the sand at Glamis before she acted up????
My question of the day is this... I ran for about 22 miles and then she acted like the Engine poof'ed on my just up and died, ten I pulled on the cord to check if piston was stuck, and she started right up???? Ran alittle more and she started sputtering again, so I switched to reserve and drifted back to camp.
I thought maybe I had run low on fuel but I only put in a gallon to top her off??? So I am guessing my fuel filter is pluged, or that This gas mixture might not be a wise idea???? Of course I don't have a spare filter...(yea I know)
What is everyone's experience with the racing fuel mixture???

I forgot to mention That there was some popping and backfireing right before she died the first time. I topped of and ran it some more then it would just act like it ran out of gas, then start right back up?????

I am guessing the obvious fuel filter, but am nervous about the fuel I put in it???
Thanks !!!

You need to verify what is going on, when it dies you need to see if its out of fuel, don't crank on it get out and pull the carb or the drain off the float bowl to see if their is fuel, the best way is to remove the carb and carefully remove the screws and float bowl so you can see exactly how much fuel is in the carb.

Your dead on with the fuel

Usually its a bit more, when a metal tank is not kept topped off it allows condensation in the tank and starts rusting, even though its just a little bit those tiny flakes will cause havoc on your fuel system.

Absolutely replace the filter, but first you might want to drain and flush out the tank the best you can. i would even pull the float bowl on the carb to clean out whatever has already got there, then if you still have issues there are further steps to save a hurting tank.

Keep us updated.

I can do the visual's today it was dark last night though. I have clear fuel lines to make it easier...

We have had very similar sounding problems after we started hopping up the 350s. After countless hours of troubleshooting(LOL), we realized that the fuel was not keeping enough flow to the carb under long hard excelleration and hard cornering. Our "shade tree" fix was to put a restriction in the return line(after the tee but before the tank). We used a main jet. That forces more fuel to the carb and fixed the problem on our 3 built machines. I have not had any fuel/carb overflow problems, just make sure all your fuel line clamps are tight otherwise they may seep fuel due to the higher pressure.

The quickest way to tell is to totally block the return line and take it for a quick ride to see if it fixed the problem but do not recommend that you leave it like that. Might due a compression check too just to be sure all is well inside.

Keep us posted,
Gary

Nuke welcome back from the hunting trip!!!
You are close??? I am not seeing any fue going back into the tank after the t or whatever that is called??? (tpi Valve) every once in awhile it will trickle in but not after it's run for a while... I can go good about 300 /400 yards thens she sputters and stalls... then she will take about 1/2 minute to restart and off we go again, not much fun??? Would a lower octane (pump gas ) eliminate this problem???
It's a 60 mile round trip to wal mart for a lawn mower filter...(temp fix)

Remove the fuel filter and back flush it with carb cleaner see if anything comes out, if it has rust inside then fill it with carb cleaner and put your fingers over the openings and shake it up then pour it out on a paper towel until you get it as clean as you can.

The race fuel or mixing it, is not your problem, if anything it should run a bit rich compared to straight oxyengenated pump fuel.

sounding more like filter or the pick up it self, but again that would be a Symptom and not the Cause


and I know the ride very well, you need some ice anyways

Like Hare said, its not a fuel type/mix problem, its a delivery problem to the carb. This is what I would do...

First make sure you have some gas in the carb bowl(use a syringe or tiny funnel to add it to the fuel line to the carb). Next disconnect the fuel line from the pump out, then start the Engine and let it idle. Be sure you have some type of catch bottle to catch the pumped fuel. It should be gurgling out fairly heavily. If not, then do the fuel filter cleaning mentioned above. If the filter is plugged with rust particles, then you may need to have the tank boiled, Creamed or otherwise refreshed. If the filter is fine, then check the pump vacuum line from the crankcase. It may have loose clamps, holes, cuts or be cracked. The fitting behind the clutch is tough to check with the clutch installed.

Keep us posted with what you are finding!

Well the easy way was what I chose to do today, since I am a long way from home... I bought a fuel filter from napa, and replace the OEM as a temp fix... I will order several OEM filters. I did the hoser clean out and as the pictures show we have rust!!
What is involved with the purgeing and preventing any new rust once purged???
Parts guy suggested taking to a radiator shop and dipping in acid??? but that kinda ruins the outide I would think???

After installing new filter I didn't ride but idled and watched fuel flow, I noticed the fuel coming into the pump had no bubbles but coming out of pump into tpi valve bubbles in line, and also bubbles in line before dumping back into tank...
Is this normal???

I did leave the pilot jet in the return line to help with the pressure into the carb...

Dunno about the 350 but the 250's and Pilots I have owned it is normal not to see the lines completly full and to see bubbles.

OK that is good, I thought so also, but I haven't been around em enough...