Arborjet taking in air at needle

[Basswood]

One of my kits randomly started pulling air in through the needle when the plunger loads back again, kind of like a back flow. It has quick connects for the lines and I cut those and reattached on the line from the plunger to the needle but that didn’t work. Any other solutions?

 

[Gus64]

One of my kits randomly started pulling air in through the needle when the plunger loads back again, kind of like a back flow. It has quick connects for the lines and I cut those and reattached on the line from the plunger to the needle but that didn’t work. Any other solutions?

Are you using the QuikJet Air kit/injector?

 

[Basswood]

Are you using the QuikJet Air kit/injector?

Yes

 

[Gus64]

In my experience using this it could be a couple of things--see attached pic. Sometimes I need to replace or at least clean them out.

 

[Gus64]

Part 070-0100 would be the first thing I would check/clean/replace first.

 

[Basswood]

Will give that a shot thanks

 

[ATH]

also take apart/clean:

70-2366
975-1128 - there is a little check ball in there

 

[Basswood]

The needle was also swapped out. I’ll try all of these suggestions hopefully tomorrow. The unit was clean but did about 200-300 injections in the past week before the issue.

 

[Gus64]

Yes, regarding the in-line check valve, #70-2366: I notice that the ends of the tubing that are inserted in it need to be sharply, cleanly cut so there's a good seal inside the valve. As the line gets pulled it sometimes gets yanked from inside the check valve and thus air gets in and won't pump the product through.

These units work great but can be finicky.