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  1. Performance Discussion
    I am swapping a 1989 4b into my TJ. As some will know the first Gen Cummins B engines, from 89-93 had 9mm injector holes. This led to lots of cracked heads. In 94 they switched to 7mm holes and the p7100 fuel pump. My stock head off the 4b was cracked, so I bought a second hand head from a skid...
  2. Detroit, Perkins, Caterpillar
    I have a GM 353 marine diesel and have air in the line fuel line. I purchased a hand pump with gauge in order to purge the system but have not done this before. Is the best way to attach it to the fuel filter with the other end on a pail of clean fuel? How much pressure should I build up on the...
  3. Isuzu 4BD1T/2T
    I searched the forum for fuel line suggestions and things were vague. Can someone give me a solid size for the fuel feed and return lines for the 4BD1T? My engine is out of a '90 NPR, if it helps.
1-3 of 3 Results