XXL 454 vacuum leak?
#1
Thread Starter
XXL 454 vacuum leak?
I have a pretty new just broken in 454 that seems to have a vacuum leak. Got it running and performing fairly well, but there are constantly air bubbles in the fuel line and the engine overheats even when running full out without a shell and smoking (although it smokes mostly when turning (???)). The tank is full, and I pressurized the fuel system from the muffler line thru to the carb and there are no leaks at all. I snugged the hi speed needle housing - it was a little loose, but still an issue.
Ideas?
Ideas?
#2
RE: XXL 454 vacuum leak?
ORIGINAL: Dmon1996
I have a pretty new just broken in 454 that seems to have a vacuum leak. Got it running and performing fairly well, but there are constantly air bubbles in the fuel line and the engine overheats even when running full out without a shell and smoking (although it smokes mostly when turning (???)). The tank is full, and I pressurized the fuel system from the muffler line thru to the carb and there are no leaks at all. I snugged the hi speed needle housing - it was a little loose, but still an issue.
Ideas?
I have a pretty new just broken in 454 that seems to have a vacuum leak. Got it running and performing fairly well, but there are constantly air bubbles in the fuel line and the engine overheats even when running full out without a shell and smoking (although it smokes mostly when turning (???)). The tank is full, and I pressurized the fuel system from the muffler line thru to the carb and there are no leaks at all. I snugged the hi speed needle housing - it was a little loose, but still an issue.
Ideas?
I found out with my LST2 fuel tanks (the 220cc ones) tend to touch the chassis when the 3 screws are snugged down all the way where the feed fitting to the carb is located on the tank. This is going to cause vibration problems and can be a pain to get a mixture setting to "stick". Since you should have the tank out to verify it doesnt leak, get a piece of foam tape or foam weather stripping and stick a little chunk on the bottom of the round fitting area on the tank. Dont snug the screws all the way tight and this should help. If after all of this you still have bubbles, then I suggest getting a small bottle of Armorall Original and put a small squirt into your bottle of fuel. This works very well keeping bubbles at bay. RC airplane pilots have been doing this for decades. I make my own RC fuel and this is what I use to de-bubble the fuel. This should be a last resort, though. Ensure all else I mentioned is set up properly, and that should do the trick.
#3
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Join Date: Oct 2011
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RE: XXL 454 vacuum leak?
HELP!! my losi lst2 wont respond to my radoi anymore. it worked fine untill i charged the batteries in the truck with a new charger. now nothing happens at all. i have a jr xs3 radio. im thinking its the battery in the truck. im thinking about getting the AA battery tray back in it. any suggestions?
#4
RE: XXL 454 vacuum leak?
ORIGINAL: bigben3576
HELP!! my losi lst2 wont respond to my radoi anymore. it worked fine untill i charged the batteries in the truck with a new charger. now nothing happens at all. i have a jr xs3 radio. im thinking its the battery in the truck. im thinking about getting the AA battery tray back in it. any suggestions?
HELP!! my losi lst2 wont respond to my radoi anymore. it worked fine untill i charged the batteries in the truck with a new charger. now nothing happens at all. i have a jr xs3 radio. im thinking its the battery in the truck. im thinking about getting the AA battery tray back in it. any suggestions?
Make sure you didnt charge it backwards and that the battery lead is seated in the receiver along with the servo leads.