DPA pump leak

[pmms]

Hi has anyone pulled the end plate assembly off a DPA pump? I have a slight fuel weep from the joint between the end plate and the main body, there is an o ring that sits there ( picking one up today £1) but wondered if there were any catches. Last time I stripped a DPA was '74 doing C&G course and frankly cant remember.

 

TIA

 

Paul M

[Tony Brooks]

Hi has anyone pulled the end plate assembly off a DPA pump? I have a slight fuel weep from the joint between the end plate and the main body, there is an o ring that sits there ( picking one up today £1) but wondered if there were any catches. Last time I stripped a DPA was '74 doing C&G course and frankly cant remember.

 

TIA

 

Paul M

 

I think that you will just find the end of vane type transfer pump under there with the regulating valve and springs retained in the end plate by the inlet union (not big hexagon, not the pipe nut). I am sure nothing will spring out at you.

 

While you are at it think about undoing the big hexagon to check the strainer that may be under it is clean. The springs in the regulating valve will push up but are unlikely to jump out.

[pmms]

I think that you will just find the end of vane type transfer pump under there with the regulating valve and springs retained in the end plate by the inlet union (not big hexagon, not the pipe nut). I am sure nothing will spring out at you.

 

While you are at it think about undoing the big hexagon to check the strainer that may be under it is clean. The springs in the regulating valve will push up but are unlikely to jump out.

Thanks for that Tony, good point about the strainer, the pump is the original, 19 years old so I'm hoping its not a FAME related issue. I'll keep the forum updated

 

Paul M

[Tony Brooks]

Thanks for that Tony, good point about the strainer, the pump is the original, 19 years old so I'm hoping its not a FAME related issue. I'll keep the forum updated

 

Paul M

 

Just check your sump oil more regularly because if it is a Fame issue the engine will do a "Lister" and start filling its sump with diesel from the pump shaft seal. However an overhaul would get all the seals changed. At present it is not worth doing anything more.

[pmms]

Update on the pump leak in the OP.

 

End cover plate secured with 4x 8mm bolts, older pumps may be 5/32", ours is 1993. Seal (£1 from our local FI specialist, Dales of Longport, highly recommended) sits in an annular groove in the pump body and comes out easily, be aware that there is a locating roll pin in the pump body, it is tiny and black so if loose it would be easy to miss if it fell out during removal of the end plate. The inlet screen filter cleaned at the same time (thanks Tony B ) all reassembled and appears to be leak free. As with all things related to fuel injection pumps cleanliness is essential, so I thoroughly cleaned the area before removal of the end plate.

 

Hope this may be useful.

 

Paul M

Edited November 8, 2012 by pmms