Posted by Blueboy on December 18, 2015 at 20:38:41 from (67.20.251.27):
I have a Detroit 3-53 in a Dynahoe backhoe that seems to have a fuel problem. This machine sat for about 15 years, the old fuel has been drained and filled with new. I put new filters, new fuel lines and everything else in the fuel system is good and clean.
My problem is I'm getting air bubbles in the return line out of the head. I've checked from the pump to the tank and there are no leaks. From the pump to the secondary filter there are no air bubbles that can be seen in a clear hose.
I was convinced it was a bad injector(s) leaking compression back into the fuel. But I was told by a friend of a friend (an expert) that would be impossible because the injector pressure is higher than cylinder compression.
Now I'm kind of stumped where the air bubbles are coming from. It gets worse as the engine gets to operating temperature.
I posted this on the Heavy Equipment Forum and there is a link to it at the bottom. It's 124 replies long but is a good read.
It has a YouTube link of the problem I'm having in post 57, 77, 89, 112.
What seems odd is when I pinch the return line the bubbles go away as seen in post 89 and 112
The guys on the Heavy Equipment Forum are awesome and helped me out big time! I didn't realize I had a fuel problem but they spotted it right away.
They suggested to run the rack and replace the injectors. I totally agree and plan to do so come spring time.
I'm posting here to see if someone can tell me exactly what's going on with these bubbles. Why they go away when I pinch the hose. And if there is anything we might have missed.
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