Hi Guys, first question use of hydraulic hose for fuel system. Near as I can tell going
back to 1996 and 2003. So far than mfg started to use plastic fuel line. What I can tell
so far aftermarket Racor filter prime setup and aftermarket primary fuel filter setup.
What we have found hydraulic hose was used starting from fuel tank to primary fuel
filter than exit primary filter to fuel transfer pump than will go back to Cat OEM fuel
hose to the secondary 2 micron fuel filter. At present all that is required, replacement
of hydraulic hose ( read my above post ) between primary fuel filter and fuel transfer
Pump. This ( 1 ) hose replacement will contain all debris within fuel filters.
Question Cat fuel pre made fuel hose and what a Cat fitting and a JIC fitting. ( Cat fitting )
female swivel fitting has a flat face. Cat male fitting has a flat face with groove for a
o-ring that makes the seal when tightened. JIC female swivel has a 37 degree bevel
inside of hex swivel. JIC male has a 37 degree bevel before the threads to tighten into
female swivel. In our fuel problem aftermarket JIC fittings were used is which is used
Industry wide and a very good coupling, but not used very much with Cat equipment.
Question number 3, Cummins Fuel Systems. The Cummins fuel system uses a cloth covered
plastic fuel line and there fuel system is different than the cat system and has not been
changed with aftermarket setup. Last, the type of hose connectors for newer Cat with plastic
fuel hose another story they have a o-ring that is problems because they cannot seal
after o-ring gets hard. Thanks for the questions hope this answers your thoughts.
Dave Atherton Retired Cat Mechanic