Detroit Series 60 repeatedly losing prime

I drove a International Prostar that that had a split draw tube in the tank. Since it was integral to the tank the whole tank had to be replaced. So cracked fittings, bad lines and draw tube would be something to consider. Also, trash sucked up into the draw tube or lines.

 

Have you Blocked the Line where it goes into tank and then put pressure in where it goes onto the primary filter to see if the line has any leaks ? It could also be the pickup tube inside the tank
Also it could be the suction line collapses on the inside blocking fuel off

 

I'm having the same problem. Mine only does it in the morning tho. The first start it takes really long to fire up but after it is fired up it is good for the rest of the day.

 

Start simple... o-rings on fuel filter housing, cap, replace after every use.. I tried leaving the old one in there once thinking well i only changed it 15k miles ago and it still looks good... nope. Lost prime after sitting for 10 min off.

 

Sounds like the check valve’s bad on the head return line. Easy fix.

 

2nd the check valve on back of the head.