DPA pump stuck plungers

[John b]

I read somewhere that connecting an injector test pump to an oulet on a DPA pump, pressurizing it and turning the pump by hand until the corresponding fuel gallery lines up will free stuck plungers. It sounds feasable but has anyone tried it? Curios to know if it works and would possibly save a pump strip

[John b]

Well to answer my own question, yes it does work! Removed the pump which would bleed ok but had no fuel to the injectors after marking its position for timing. Connected one of the outlets to the injector tester and pumped it up to 1000 psi, turned the pump by hand until the corresponding gallery lined up and the plungers popped back down. Works fine now, I will add a can of injector cleaner to the fuel to clean and lube the pump but it has saved having to strip the pump or pay someone else a fortune to do it

[Billy26F5]

Very good trick, probably not valid on an in-line pump unless the delivery valves are removed. Well worth doing on a rotary pump.
Sandy

[John b]

I think you are right about the in line pump and delivery valves Sandy, although an in line pump is far easier to strip apart than a CAV, as long as the settings aren't altered