Stihl 026 fuel system probs.

[mucker]

I've got an 026 circa 95' not done a lot of work. I seized it recently because the filter in the carb under the top plate was partially blocked and I leaned it right out to try to get it to run at full revs also without the top cover on, so no forced air. Anyhoo, I replaced the piston and barrel plus the fuel pipe and tank filter but am finding that after two or three tankfulls the same filter in the carb (on the fuel side mind) is getting blocked up with really fine debris. How is this stuff getting into the system, could it be coming in through the tank breather? Any ideas or thoughts would be gratefully recieved.

[spudulike]

I had a similar conversation with Burrell about his 024. This gunk MUST be coming ini from the tank, the gauze filter is just after the fuel enters the carb, it can't come in from the bore/choke of the carb.

 

I think your tank needs a damn good flushing out with fuel or perhaps white spirit, get some clean lint free cloth in there and give it a damn good wipe around, change your fuel filter for a new one and try again. Also use a petrol funnel with a gauze mesh filter in it plus make sure the cap and seal are cleaned regularly so no crap falls in to the tank.

 

Cheap pure brisle paint bruushes are good for cleaning the caps!

 

It is very unlikely the breather will be letting in dust unless it isn't original or is damaged.

 

Hopefully this will sort the issue - I have seen metal fuel filters abrade the inside of the fuel tank and draw the plastic in to the carb - looked like orange gunk:lol:

[mucker]

Thanks for that spud, thats about as far as I can get too, seems bizzare when you think about how much of the system has been already been changed, anyway might as well go all the way and finish the job.

[spudulike]

Only other thing worth checking is that the fuel pipe isn't split but that usually gives other issues!

 

Hope you get it sorted and is probably just old fine crap swilling round the tank being drawn past the fuel filter that is also probably full of fine crap!

[GardenKit]

Briggs have noticed a problem with some of their pastic carbs recently. They seem to be losing plastic from the surface which then blocks the jets.

 

This has been put down to the inreased rates of ethanol in petrol over recent years.

 

Maybe the same is happening here with the internal surface of the tank being attcked by the ethanol and leaving a residue which then washes through.