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Van fuel system
Actually, a 1995 van should have a mechanical fuel injection system very similar to the 1984 Suburban you referenced.
A PMD is a pump mounted driver, the "black box" located on the driver's side of the injection pump (if it has not been relocated). It is part of the electronic injection system that began with the 1994 year model vehicles (but not vans).
The OPS is the oil pressure switch. It has a contact for the oil pressure gauge and a separate set of contacts for the electric transfer (lift) pump. The contacts for the lift pump are not large enough to carry the current required by the pump and the switch fails over time. The engine may or may not run without the lift pump, may or may not miss under heavy load, but the injection pump runs hotter without the excess fuel provided by the lift pump.
Your vehicle is probably getting air into the fuel system between the tank and the injection pump. A fuel hose does not always leak fuel out when it lets air in. Check ALL fuel hoses and connections. One hose, under the intake manifold, often is never checked.
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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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