header tank not working?

[squeaky pete]

was ment to ask yesterday, i got a head tank on my 600, but before i crashed it yesterday i was pitch pumping and doing full thottle climb outs, and when i came down to check the temp of the engine the header tank was half empty and the main tank was still half full!! and ideas?

[jamiem]

sounds like a split clunk link in the main tank. if you hadnt had a header, the engine would have quite long before you noticedyou had half a header tank left, so it is working, just something else isnt

[old gimmer]

possible the clunk line in main tank needs looking at could be sucking air due to small hole or split on the nipple when header runs down is usually a main tank clunk line problem

[Janek]

Definitely a problem with the main tank clunk line, classic symptom. . . . . . I crashed the weekend before last when exactly the same happened to me, typical it was downwind, with and out of sight landing on the auto !

Only broke the blades and bent the boom/torque tube.

Don't however just replace the main tank clunk line, change the header tank line as well

[Sesame]

Depending on what tubing your using this stuff can go like jelly in no time, I change all my tubing approximately every 6 months ish(when I remember )

[squeaky pete]

thats the thing, its only had 10 tanks max thru it!! lol! am gonna change both of the clunks to be sure tho! just thort i mite of set up rong!

[HiltonSteve]

My main tank clunk fuel tube that came with the kit split twice on the first 2 flights with the same symptoms as yours. Changed it for some better tubing and its been fine ever since.

I'd put money on thats what problem is.

[squeaky pete]

cool, will be changing that then and let you know what happens!

[Sesame]

when I first fly a model or have changed the tubing just to check its all plumed right I fill the tank and then empty it through the header clunk with a hand pump just to check it all flows correctly and that I havn't split any pipes putting them together

[squeaky pete]

mine fills up and emptys fine, thats why i was miffed, not that ive ever had a nitro before. i always fill up and emtpy the tank after flying to get the exhaust gases out the tank and it works fine then, just when flying