18-02-2022, 02:28 PM
(This post was last modified: 25-02-2022, 11:56 PM by Hedd_Jones.)
As can be seen on another thread the RP here conked out through lack of fuel yesterday.
It has a AC T type pump, the bottom half is actually fairly new, as supplied as a complete pump assembly by Jamie to father some years ago. Father clearly swapped the top for an old T type top. I remember something about sticking valves back then, but don't know the details.
Anyway, It sounded like it was doing the business, but wasn't sucking fuel from the tank.
I've stripped it down, the diaphragm is all good, and the bottom end works as it should. The valves on the T type top are slabs of fibre with springs, and while these appear free etc, testing things out by blowing and sucking through various orifices suggests at least one isnt working correctly. Ive had them apart, saw no obvious problems, save fairly rough surface to the fibre and reassembled. Still the same.
Please let me know if the image do not work.
I do have countless other similar tops. but its obvious doing a google search that it seems to not be possible to buy the fibre slabs in a repair kit.
However, I did find a brand spanking new U type pump. Different bottom end and levers, fitting this to the existing bottom seems to have got me a usable pump, which clearly sucks. The outlet is a little higher in relation to the pump body, but a quick anneal of the pipe and some bending will easily cure that.
As was
As is now on the Austin compatible bottom end
Am I missing something, but is there any reason a U type pump cannot be used?
It seems the U type has larger capacity. However my understanding was these pumps idle when the circuit between the carb needle valve and the top of the diaphragm is full. So it shouldn't make any difference. It might be better when the car is cold, the old pump struggled keeping up with che strangler engaged (perhaps a sign all was not well with it in hindsight)
It has a AC T type pump, the bottom half is actually fairly new, as supplied as a complete pump assembly by Jamie to father some years ago. Father clearly swapped the top for an old T type top. I remember something about sticking valves back then, but don't know the details.
Anyway, It sounded like it was doing the business, but wasn't sucking fuel from the tank.
I've stripped it down, the diaphragm is all good, and the bottom end works as it should. The valves on the T type top are slabs of fibre with springs, and while these appear free etc, testing things out by blowing and sucking through various orifices suggests at least one isnt working correctly. Ive had them apart, saw no obvious problems, save fairly rough surface to the fibre and reassembled. Still the same.
Please let me know if the image do not work.
I do have countless other similar tops. but its obvious doing a google search that it seems to not be possible to buy the fibre slabs in a repair kit.
However, I did find a brand spanking new U type pump. Different bottom end and levers, fitting this to the existing bottom seems to have got me a usable pump, which clearly sucks. The outlet is a little higher in relation to the pump body, but a quick anneal of the pipe and some bending will easily cure that.
As was
As is now on the Austin compatible bottom end
Am I missing something, but is there any reason a U type pump cannot be used?
It seems the U type has larger capacity. However my understanding was these pumps idle when the circuit between the carb needle valve and the top of the diaphragm is full. So it shouldn't make any difference. It might be better when the car is cold, the old pump struggled keeping up with che strangler engaged (perhaps a sign all was not well with it in hindsight)
