Quote:
Originally Posted by vstech
I thought the GM's had either a manual lift pump driven off the cam, or an electric pump in the fuel line from the tank...
I KNOW my 92 has an electric lift pump and there is a stinking oil pressure switch that goes bad killing the power to the pump sometimes... arrgh!
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Yes, my memory lapsed a little. Back when I worked on them they had Diaphragm Lift Pumps.
However, the Stanadyne Fuel Injection Pump still has a Fuel Supply/Lift Pump
Below is what you are speaking of and Transfer Pump is yet another name used for Lift Pump.
"
Fuel is drawn from the fuel tank by a mechanical lift pump that is completely independent of the DB2 injection pump, and passes through filters and into the injection pump inlet. From there,
fuel flows past the inlet filter screen to the vane-operated transfer pump located in the DB2 pump end cap. The vane-type transfer pump consists of a stationary liner and spring-loaded blades carried in slots at the rear of the transfer pump rotor. As the blades rotate in the liner, they move outward and the volume increases until the leading blade passes out of registry through the inlet slot. The fuel between the blade is carried to the bottom of the transfer pump liner and enters the outlet groove. As a result, pressurized fuel is delivered through the pump into a channel to the hydraulic head
passage."
The above in blue is what I was trying to seak of.
The above is from the below Link.
http://www.dieselpowermag.com/tech/general/0809dp_stanadyne_db2_injection_pump/viewall.html
The Stansdyne DB and DB2 Fuel Injections Pumps are used on other Engines and they may or may not have Lift Pump between the Fuel Tank and the Fuel Injection Pumps.