I thought my fuel system was air-locked. In fact, it appears that
there was a blockage in the fuel pump - the plunger wouldn't move. Of
course when I poked into the hole (as you do!!) the plunger popped
out, in pieces (as it would!) I reammembled it (using my initiative -
and this is probably the weak link in the process!) and replaced it
back into the pump. Fuel now passes through - but to excess ithink,
as the boiler only fires (very loudly) for a short time before blowing
out. Any ideas or has anyone a diagram of this pump? It'ss a fairly
old system (installed about 30 years ago; boiler casing says Thorn,
motor says Compton..?, fuel pump has Danfoss? on it and there is a
label with an arrow and S & R at either end.

"wb" wrote in message
...
I thought my fuel system was air-locked. In fact, it appears that
there was a blockage in the fuel pump - the plunger wouldn't move. Of
course when I poked into the hole (as you do!!) the plunger popped
out, in pieces (as it would!) I reammembled it (using my initiative -
and this is probably the weak link in the process!) and replaced it
back into the pump. Fuel now passes through - but to excess ithink,
as the boiler only fires (very loudly) for a short time before blowing
out. Any ideas or has anyone a diagram of this pump? It'ss a fairly
old system (installed about 30 years ago; boiler casing says Thorn,
motor says Compton..?, fuel pump has Danfoss? on it and there is a
label with an arrow and S & R at either end.

Go and look on the Danfoss Web site for a suitable replacement pump, then buy
one from someone like HRPC.

The pumps dont last for ever. (well not in my house!)

Also buy a pressure gauge with T piece and maybe a high pressure flexible hose.

Install new pump and set to work at correct pressure.

--

Michael Chare

"Michael Chare" wrote in message
...

Go and look on the Danfoss Web site for a suitable replacement pump, then
buy
one from someone like HRPC.

The pumps dont last for ever. (well not in my house!)

Also buy a pressure gauge with T piece and maybe a high pressure flexible
hose.

Install new pump and set to work at correct pressure.


And then possibly reset the flame settings as well.

"wb" wrote in message
...
I thought my fuel system was air-locked. In fact, it appears that
there was a blockage in the fuel pump - the plunger wouldn't move. Of
course when I poked into the hole (as you do!!) the plunger popped
out, in pieces (as it would!) I reammembled it (using my initiative -
and this is probably the weak link in the process!) and replaced it
back into the pump. Fuel now passes through - but to excess ithink,
as the boiler only fires (very loudly) for a short time before blowing
out. Any ideas or has anyone a diagram of this pump? It'ss a fairly
old system (installed about 30 years ago; boiler casing says Thorn,
motor says Compton..?, fuel pump has Danfoss? on it and there is a
label with an arrow and S & R at either end.

I think you have buggered up either the solenoid valve or the pressure
regulator since most Danfoss pumps are gear type not plunger. You could save
yourself a lot of wasted time and grief by simply replacing the Danfoss pump
now instead of buggering about for ages and then buying a replacement
anyway. The usual old domestic Danfoss was the MSLA which was superseded by
the BFP21L3 or BFP21R3 depending on the direction of rotation (the L being
most common)
Source one from Parts Centre in your locality (was HRPC) You are going to
really struggle to set the burner up again unless you know the original
pressure setting and have a flue gas analyser kit.