New issue, now loses prime after sitting

[fruitcakesa]

After I thought I had solved my no start/no fuel issue, I now find that after sitting for just a little while, it loses prime.
It will chuggingly restart after a few 10 second cranks and then smooth out and run fine.
I went back over all of the hoses that I pulled off and then reinstalled during the earlier problem troubleshooting to ensure they were seated and clamped.
No obvious fuel leaks so I might assume there is an air leak somewhere.
How would you go about tracking this down?

 

[Fxfymn413]

Make sure the primer vent screw on the filter is tight.

 

[fruitcakesa]

Make sure the primer vent screw on the filter is tight.

As far as I can tell there is no vent on the filter

 

[Fxfymn413]

How do you prime the filter? On my 4060 there is a pump button you push down repeatedly to pump fuel into the filter after you open the vent screw to let the air out.

 

[Fxfymn413]

How do you prime the filter? On my 4060 there is a pump button you push down repeatedly to pump fuel into the filter after you open the vent screw to let the air out.

My error; I was thinking of doing my Duramax. OOPS!

Apparently on the M4060 all you can do is pump it in. My only swag would be a leak at the spin on filter. I'd try pulling it to see if the seal is seated correctly and to make sure there is not an extra seal there from another filter.

 

[fruitcakesa]

My error; I was thinking of doing my Duramax. OOPS!

Apparently on the M4060 all you can do is pump it in. My only swag would be a leak at the spin on filter. I'd try pulling it to see if the seal is seated correctly and to make sure there is not an extra seal there from another filter.

Same on my M, no bleeder.

 

[fruitcakesa]

Rather than working on the fuel lines just before the storm hits [which is what started this whole issue last time I did some work],
Yesterday I tried a test where I shut off the fuel lever at the water separator right after I shut it down .
This morning, I figured it would need a prime so I pumped up the filter, and could hear what I thought was air bubbling, till it got noticeably hard to pump. This is the first time either of those things have occurred.
I switched on, cranked and it turned over maybe 1 or 2 revolutions then fired right up and settled into a clean idle.
No pumping, cranking and stuttering and then do it 4 more times to get it to start.
So what can I deduce from this new behavior?

 

[Fxfymn413]

A leak at the water separator gasket?? I'd pull it and just check to ensure the seal is not pinched, etc. Its tough because you are looking for air leaking in, not fuel leaking out.

 

[fishdrivel]

There is a leak.
Somewhere easy or hard to find. But there is a leak.

 

[fruitcakesa]

I can prime it and get it to run for now; just waiting on a break in the weather to begin to search for for the leak.