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Lift pump
Three of them, to be exact.
Carter P4070, though there are other comparable models out there.
15 to 30 GPH, at 6 to 8 PSI, works in the 6.2/6.5 application.
If you want to be certain about lift pump operation, install a mechanical pressure gauge. It also helps diagnose restrictive filter(s).
To block off the opening in the block, if replacing a mechanical lift pump, use a Mr. Gasket P/N 1515.
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Harry D Jacobson, P.E.
35 years of auto repair experience
83 G-20: 599 block|567 heads|Wix 33123 & Racor 230R (2 micron) fuel filters|Energy Suspension|Ride Rite air springs
84 K-2500: C6P frame|Quad front shocks|Posi|Manual hubs|Wix 33123 & Racor 220R (2 micron) fuel filters|Prothane|SS braided brake hoses
99 C-2500 Burb: 6.2 (599 block) Turbodiesel
ALL: ARP head studs|DSG gears|Carter P4070 (no OPS)|Fluidampr|External coolers w/SS braided hoses|1/0 battery cables
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