beetlebug Posted August 24, 2016 Share Posted August 24, 2016 Hi im having trouble priming my sons HPI Trophy Truggy. It hasn't been used for a couple of years but i'm sure we had this problem before and probably why we stopped using it. It won't prime when exhaust blocked and engine turned over. I then tried taking pipe off exhaust and blowing through it but no air would go into tank. I then took pipe off carb and blow into pipe and fuel then come out of carb pipe. Does this mean no problem with tank and pipes but a problem with carb? Any advice appreiciated. Quote Link to comment Share on other sites More sharing options...
Sayce97 Posted August 24, 2016 Share Posted August 24, 2016 It may be gummed up fuel in the carb, i fixed it by making note of the needle settings (high speed and low speed) completely unscrewing them, clean and screw back into the same settings. There may be a better way of doing it but that worked for me Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
HellaFlush Posted August 24, 2016 Share Posted August 24, 2016 1 hour ago, beetlebug said: Hi im having trouble priming my sons HPI Trophy Truggy. It hasn't been used for a couple of years but i'm sure we had this problem before and probably why we stopped using it. It won't prime when exhaust blocked and engine turned over. I then tried taking pipe off exhaust and blowing through it but no air would go into tank. I then took pipe off carb and blow into pipe and fuel then come out of carb pipe. Does this mean no problem with tank and pipes but a problem with carb? Any advice appreiciated. Yep you're going to want to strip down the carb and clean it out, also probably won't hurt to clean out the tank and get some new nitro fuel line Quote Link to comment Share on other sites More sharing options...
beetlebug Posted August 24, 2016 Author Share Posted August 24, 2016 Thanks guys, will give that a try. Quote Link to comment Share on other sites More sharing options...
RCbutcher Posted August 24, 2016 Share Posted August 24, 2016 A tank leak could do it too no seal no vacuum. Quote Link to comment Share on other sites More sharing options...
atom3624 Posted August 24, 2016 Share Posted August 24, 2016 For the same symptoms, it's probably running lean - reasons as above - leak, gummed up carb. Main thing is check for leaks - exhaust gasket and loosening head bolts were favourites for my nitros when I had them. Al. Quote Link to comment Share on other sites More sharing options...
KevAmiga Posted August 25, 2016 Share Posted August 25, 2016 also - try opening throttle when blowing, air flow should allow it to prime up. But its prob down to a seal on the lid of the tank (give it a wipe) and / or change the fuel pipe. If you pull the fuel line off the carb then blow down the exhaust line, does fuel flow out? Quote Link to comment Share on other sites More sharing options...
beetlebug Posted August 25, 2016 Author Share Posted August 25, 2016 Yes fuel will flow with pipe off carb. Quote Link to comment Share on other sites More sharing options...
Burridge Posted August 25, 2016 Share Posted August 25, 2016 Take your airfilter off and open your throttle. Then take your pressure line off your exhaust and blow down it. You should see a stream of fuel flowing into the carb, with some resistance when blowing through the tube. If there's heavy resistance then your carb may be blocked. Little resistance and no fuel going through and the seal on your fuel tank lid is gone Quote Link to comment Share on other sites More sharing options...
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