Pumps are not as easy to find cheap for any of the 6.5s. The full mechancial pump for 6.5s - turbo or non-turbo, was only made for one or two years for Civilian use (up to 1993). Many more were - and still are made for the military. Any pump model number ending in 29 - is a 6.2 pump with .29" pump plungers, whereas any pump model number ending with 31 is a 6.5 pump with .31" diam. pump plungers. With civilian models, the DB2 pump was only used up to 1993. After that, the electronic-controlled DS4 was used. Some DS4 pumps use a pump-driver that will not allow use of all fuels. I only used waste oil products in my GM 6.2s, Isuzu 2.2s, and my Ford IH 6.9s and 7.3s. In regard to prices - I often buy entire engines with pumps on them, in the $50 price range. I've got over a dozen spare injection pumps sitting on my shelf. About filtering - all my waste vegetable oil gets poured through a cheese-cloth, then dumped into my bulk fuel tank. My waste engine oil gets no pre-treatment at all, just goes directly into my bulk tank. My bulk fuel tank is 600 gallons and has a fuel pump with its own fuel filter on it. I've had zero problems, but the content of waste-oils to the diesel is never more than 20%. And, one warning. Just a few gallons of waste motor oil turns the entire 600 gallons a dark color. Not sure what questions would come up if my fuel tank was ever "dipped" and the dark color noticed. Here are a few DB2 pump numbers for 6.5s. DB2831-4911 10183901 1992-93 HD C/K & P - Turbo (200 hp) DB2831-4927 14098655 1992-93 HD C/K & P - Turbo, 1.2 cSt DB2831-4970 10154607 1992-93 SD - Turbo (15,000 GVW) DB2831-4971 10154608 1992-93 SD - Turbo (15,000 GVW), 1.2 cSt DS4831-5067 10225930 1994-96 LD & HD C/K, G, and P3 Truck & Van * DS4831-5288 DB2831-5079 10224039 1993-97 2½ Ton Cab-over (Military) - Turbo (200 hp) DB2831-5088 10229115 1994-97 HD P & G Van - N/A (170 hp) DB2831-5089 10229119 1994-97 HD P & G Van - N/A, ALT. DB2831-5119 10238967 1994-97 HD P Truck - N/A, 2600 RPM (120 hp) 6.5 Liter Applications DB2831-5129 12550269 1994 HD P & G Van - N/A, 1.2 cSt (170 hp) DB2831-5149 12550433 1994-96 HMMWV (Military) - N/A, 1.2 cSt (170 hp) DB2831-5157 12551521 1994 HD O.E.M. - Turbo (200 hp) DB2831-5164 12552397 1992-93 HD C/K & P - Turbo (Man. Trans.) Service DB2831-5167 12552621 1992-93 SD - Turbo (15,000 GVW) DB2831-5209 12555697 1995-97 HD (Military) - N/A, 1.2 cSt DB2831-5323 12559097 1997 HD 6.5 replacement for 6.2 (3 speed Auto. Trans.) DB2831-5436 12561383 1994 HD P& G - (170 hp) DB2831-5437 12561384 1994 HD P& G DB2831-5438 12561385 1994 HD P - 1.2 cSt, 2600 RPM (120 hp)
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