Too much fuel problem need advise

dmeador · #1 06-07-2002, 06:25 AM

I have a pro15 motor the problem is flooding or overloading. it is real hard to start and often before I get it tarted I have to take off the fuel line to get it to start and after running fuel runs out of the muffler I thought maybe I need to adjust the carb but would like a little advice before I start twisting around on things

SCOTTC · #2 06-07-2002, 08:07 AM

it dose soulnd like you are to rich,try to lean it out a little,are you priming it to much also?

StevePond · #3 06-07-2002, 09:20 AM

Need some info from you. What type and brand of car and engine (too many companies call their engines "Pro" something) do you have? What is your start proceedure? Tell us exactly what you're doing when you try to start the engine, from "I fill the fuel tank..."

dmeador · #4 06-07-2002, 06:27 PM

I fill the tank, and it has a primeing bulb (it is a traxxas pro 15) I usally push the bulb approx 3 times until I see fuel it will usally start right off then after a second it is like it loads up and dies then it is a bugger to restart and fuel dumps out of the muffler I have never set the low needle on the carb Coyld that have something to do with it? thanks for the help guys

StevePond · #5 06-07-2002, 06:45 PM

Lemme guess, this is a Nitro 4-Tec?

dmeador · #6 06-07-2002, 07:24 PM

no its a nitro sport with a tmaxx motor

Rustler Dude · #7 06-08-2002, 09:28 PM

your low end mixture is tooooo rich. Lean that out about half a turn. Lean out your high end needle too a little. Prime it and give it half throttle while trying to start the engine.

StevePond · #8 06-08-2002, 09:44 PM

There's more to it than that. The fuel tank in his truck (the same as those used in the Nitro 4-Tec) use a weird primer/pressure line that can cause the condition described. There's a little check-ball at the bottom of a long tube that goes from the tank pressure fitting almost to the bottom of the tank. Sometimes that check ball gets stuck and, because the tube in which the valve is installed is located near the bottom of the tank, it allows fuel to flow back in the opposite direction. This will cause excessive amounts of raw fuel spilling from the pipe, and it causes fluctuating fuel pressure and a loss of "siphon" in the fuel line leading to the carb. This can make the engine a bear to restart.

This can be fixed rather easily. I've drilled the standard pressure fitting (including the long tube) completely out of the tank, then installed a standard aluminum pressure fitting with a little Liquid Steel epoxy. It virtually eliminates all the problems you mentioned. The only downside is you no longer have a primer pump, but that's easy enough to get around.

dmeador · #9 06-10-2002, 06:18 PM

thanks for all the help