This is been discussed several times. There’s a screen on the bottom of the tube that goes into your fuel tank. That screen was left over from gasoline engine fuel tanks and must be removed for a diesel engine. Blowing it out will help for a while. Ultimately you have to take the tube out of the tank and remove the screen or you will continue to have problems.
The root cause of the problem of course is water in the fuel. The interface between the water in the diesel fuel grows a slimy thing.
The slime clogs the screen or clogs one or more of your fuel filters or eventually clogs the injectors. Well you might not have such a serious problem that you can keep after by changing filters, the prudent thing to do is clean the tank.
Stuart Bell
Ranger 25: Shearwater
(561) 352-1796