Help needed on a Bendix Stromberg PD12 carb

Thanks again for the help Bomberboy. Probably going to try and remove the pipe on the left and blank it off as I’m not sure of its purpose but there is a sticker on the pipe with arrows pointing the flow away from the carb body. With regards the fuel pressure gauge on the priming fuel supply, will this just measure the fuel pressure on priming/starting and not when the engine is running?
Thanks again
Scott

The engine sadly has it’s data plate missing. From what I can find out it is from a Sikorsky H34 helicopter and the r1820 fitted with this model carb were the -84, -84A, -84B and the -90. The engine appears complete and in good condition.

Thanks for that

Could the two fuel lines at the top both be vapour returns?
Thanks again for the help.

I don’t necessarily think so, all the PD12’s I have seen (not your model specific, but it appears to be quite similar in lots of respects) generaly seem to have the fitting on the left just blanked off. some don’t even have a fitting, they just have a simple blanking plug inserted into the carb body itself.

No problem, glad I could help.
WRT the fuel feed line, I have seen this line supply both the priming system and the fuel pressure lines on some installations, so it sounds like you have the right bits going to the right places.
What dash # 1820 is it and what is the installation fitted to or from?
If I am able to help further, you only need to ask and I’ll see what I can do.

The engine sadly has it’s data plate missing. From what I can find out it is from a Sikorsky H34 helicopter and the r1820 fitted with this model carb were the -84, -84A, -84B and the -90. The engine appears complete and in good condition. Could the two fuel lines at the top both be vapour returns?
Thanks again for the help.

Bomberboy, many thanks for the information. Any help is really appreciated as this is all very new to me and manuals/diagrams of the PD12R1 appear to be few and far between!! Thanks again for the help

No problem, glad I could help.
WRT the fuel feed line, I have seen this line supply both the priming system and the fuel pressure lines on some installations, so it sounds like you have the right bits going to the right places.
What dash # 1820 is it and what is the installation fitted to or from?
If I am able to help further, you only need to ask and I’ll see what I can do.

Bomberboy, many thanks for the information. Any help is really appreciated as this is all very new to me and manuals/diagrams of the PD12R1 appear to be few and far between!! The fuel line with the arrow pointing to it is situated next to the fuel priming solenoid which is identified on the pic by the angled plug with the wiring coming from it. So you could be correct in what you say regarding a fuel supply for priming. In a manual I have for a wright cyclone (but of a different series) it shows a fuel pressure gauge feed coming from a similar area, so again you could be right in the line supplying the feed and the pressure gauge.
Thanks again for the help

Making a comparison with a slightly different version of the PD12, I can offer what I think these connection points may be, but of course they may be different.
Starting from the top left, I think this one is normally typically blanked off.
The top right is what looks to me to like is the return to tank line (vapour etc).
The line with the arrow pointing to it could be the live supply feed to a priming system via a solenoid, or it could be a dedicated line to a fuel pressure gauge transmitter…or it could do both at the same time.
The large hose that you indicate is indeed as you have interpreted, it is the fuel supply and is normally connected to an engine driven fuel pump.
The round disc held in centrally by a single bolt which is located below the incoming fuel supply on the right is the cover to the carb fuel strainer.

I hope this is of help to you?