BC. On Detroit Diesel engines two and four stroke they like to see 20 psi fuel pressure at idle and 65 to 70 psi at maximum no load rpm. Check the pressures and see what you get. Check the pressure at the secondary filter only as it is on the pressure side of the fuel pump. Check to see if you have the right restriction fitting leaving the cylinder head back to the fuel tank. It should read .080 which is an . 80 thou hole opening to keep pressure in the cylinder head to feed the injectors their proper pressure for efficient operation. Check the spill back from the return. Use a 2 gallon container, remove the return and run the engine at 1200 rpm for 1 minute. You should have roughly .9 of a gallon of fuel in the container. Also at the same time you can immerse the line into the fuel and check for air in the return which I hope you dont have. If you have the metal fuel filters with a primary sock and a metal filter for the secondary, get rid of them and change to spin on filters as these were crap and gave nothing but grief as they corroded inside and contaminated the fuel system. As you have stated about filter vacuum. these are not commonly seen on diesel engines but I guess after checking the above I would start looking at the suction line for obstructions, being pinched, old lines or junk in the tank floating around creating problems, length of lines from the tank to the pump as the pump can only suck so hard, Maybe the lines are the wrong size. Ideas from years of working on these engines.
Regards Roger On Aug 12, 4:31 pm, BC <[email protected]> wrote: > No response about high fuel filter vacuum. Does anybody know if there > is a "sock" on the pick up end of the fuel supply lines on my 42 ft. > diesel Uniflite? > Thanks, > BC --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "UnifliteWorld" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/unifliteworld?hl=en -~----------~----~----~----~------~----~------~--~---
