Fuel Vaporizes
#1
Tech Master
Thread Starter
Fuel Vaporizes
what does it mean when I have run my NMT for 6 minutes it stalls and to me it looks like the fuel vaporized either when it hit the carb or just before?!!!
PLEASE HELP ME!!!!
PLEASE HELP ME!!!!
#2
Tech Master
Thread Starter
oh yeah this is break in too and i followed the instruction manual.
#3
Tech Elite
Fuel Vaporizes
corvettecrazy;
The problem you describe is called Vapor Lock. The engine is running too hot and the Heat is being transfered to the Carburetor. Very common in off-road vehicles with not enough air moving over the engine at slow speeds. Open your High Speed Needle a tiny bit, and try to cut the body out some more to allow more Airflow over the engine. This should fix the problem.
The problem you describe is called Vapor Lock. The engine is running too hot and the Heat is being transfered to the Carburetor. Very common in off-road vehicles with not enough air moving over the engine at slow speeds. Open your High Speed Needle a tiny bit, and try to cut the body out some more to allow more Airflow over the engine. This should fix the problem.
#4
Tech Master
Thread Starter
pops: the truck was running at idle not moving on a 60 degress day, I agree with you I think it is vapor lock but I dont know what to do, also there was no body on it at the time. It also stalled when I started to slowly circle my driveway.
#5
Tech Elite
Fuel Vaporizes
corvettecrazy;
Still sounds like Vapor Lock. Try opening the HS Needle and slowing the idle speed down some.
NOTE: An Engine CAN overheat while idling, especially if the idle speed is too high. Use the idle stop screw and NOT the transmitter to adjust your idle.
Still sounds like Vapor Lock. Try opening the HS Needle and slowing the idle speed down some.
NOTE: An Engine CAN overheat while idling, especially if the idle speed is too high. Use the idle stop screw and NOT the transmitter to adjust your idle.
#7
Tech Addict
also is the fuel line going near the head? or just wen it enters the carb?
#8
Tech Elite
Fuel Vaporizes
Originally posted by V-One S
also is the fuel line going near the head? or just wen it enters the carb?
also is the fuel line going near the head? or just wen it enters the carb?
I have had this problem before. Do NOT let the fuel line touch the Head or Pipe. This can cause your problem also.
#9
Tech Master
Thread Starter
ok its vapor lock...
1 could it be the stock fuel tubing?
2 what about fuel? does 20% nitro with 14% oil run cooler than 10% nitro with 20 % oil.
3 it is vapor lock but what do I do when the fuel vaporizes at the carb not when it hits the exhaust or anything else? the line doesn't touch the heat sink or exhaust.
4 what do I need to adjust to get the temp down?
5 should the wheels spin when the chassis is on blocks and at idle?
i had more but when I tried to attach a picture of the truck and it was too big it got erased. dont know why but it did so i had more ideas but I dont remember them now.
1 could it be the stock fuel tubing?
2 what about fuel? does 20% nitro with 14% oil run cooler than 10% nitro with 20 % oil.
3 it is vapor lock but what do I do when the fuel vaporizes at the carb not when it hits the exhaust or anything else? the line doesn't touch the heat sink or exhaust.
4 what do I need to adjust to get the temp down?
5 should the wheels spin when the chassis is on blocks and at idle?
i had more but when I tried to attach a picture of the truck and it was too big it got erased. dont know why but it did so i had more ideas but I dont remember them now.
#10
Hmmm.....
Originally posted by corvettecrazy
ok its vapor lock...
1 could it be the stock fuel tubing?
2 what about fuel? does 20% nitro with 14% oil run cooler than 10% nitro with 20 % oil.
3 it is vapor lock but what do I do when the fuel vaporizes at the carb not when it hits the exhaust or anything else? the line doesn't touch the heat sink or exhaust.
4 what do I need to adjust to get the temp down?
5 should the wheels spin when the chassis is on blocks and at idle?
i had more but when I tried to attach a picture of the truck and it was too big it got erased. dont know why but it did so i had more ideas but I dont remember them now.
ok its vapor lock...
1 could it be the stock fuel tubing?
2 what about fuel? does 20% nitro with 14% oil run cooler than 10% nitro with 20 % oil.
3 it is vapor lock but what do I do when the fuel vaporizes at the carb not when it hits the exhaust or anything else? the line doesn't touch the heat sink or exhaust.
4 what do I need to adjust to get the temp down?
5 should the wheels spin when the chassis is on blocks and at idle?
i had more but when I tried to attach a picture of the truck and it was too big it got erased. dont know why but it did so i had more ideas but I dont remember them now.
#11
Tech Master
Thread Starter
well it isn't the low end because that is factory set and there is no needle for it
if it was an air leak where would I check?
if it was an air leak where would I check?
#12
I hope you dont have an air leak. Check ya tank by putting it under water and blowing into it through the line. If you see bubbles, fix where it is comeing from. About your engine....cant help ya there.
#14
Tech Elite
Originally posted by corvettecrazy
Ok its vapor lock...
1) Could it be the stock fuel tubing? (Probably not)
2) What about fuel? does 20% nitro with 14% oil run cooler than 10% nitro with 20 % oil. (Actually a Higher % of Nitro will run cooler, because of a wider needle setting and more raw fuel flowing through the engine. Stick with 20% Nitro and at Least 14% Oil)
3) If it is vapor lock but what do I do when the fuel vaporizes at the carb not when it hits the exhaust or anything else? the line doesn't touch the heat sink or exhaust. (The engine is TOO HOT)
4) What do I need to adjust to get the temp down? (Open the main Needle counter clockwise a few clicks at a time, until the temps come down or the performance suffers severly)
5 Should the wheels spin when the chassis is on blocks and at idle? (With the Wheels on the GROUND, a very slight creep is acceptable. You should not have to run after the Car/Truck at idle. On blocks the wheels may turn some, but better to lower your idle speed)
Ok its vapor lock...
1) Could it be the stock fuel tubing? (Probably not)
2) What about fuel? does 20% nitro with 14% oil run cooler than 10% nitro with 20 % oil. (Actually a Higher % of Nitro will run cooler, because of a wider needle setting and more raw fuel flowing through the engine. Stick with 20% Nitro and at Least 14% Oil)
3) If it is vapor lock but what do I do when the fuel vaporizes at the carb not when it hits the exhaust or anything else? the line doesn't touch the heat sink or exhaust. (The engine is TOO HOT)
4) What do I need to adjust to get the temp down? (Open the main Needle counter clockwise a few clicks at a time, until the temps come down or the performance suffers severly)
5 Should the wheels spin when the chassis is on blocks and at idle? (With the Wheels on the GROUND, a very slight creep is acceptable. You should not have to run after the Car/Truck at idle. On blocks the wheels may turn some, but better to lower your idle speed)
Last edited by popsracer; 03-19-2003 at 09:23 AM.
#15
Tech Master
Thread Starter
thanks to every one who help. I will work on my problem when I have some spare timeand the weather is right.