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Fuel Pump Diaphragm Tool

September 27, 2010 | Troubleshooting & Repair

By Ken Daugherty


I am illustrating a tool to set the A/B fuel pump diaphragm in the neutral position and tool to set the diaphragm and to remove the little clip from the C/912 fuel pump.

'A-B spacer block' shows the small wooden block that depresses the pump lever. The block is approx. 1/4" x 3/4" x 1 1/4".

'A-B pump tool' shows the block, 2, 30mm bolts and huts and a standard fuel pump block off plate.

'A-B' tool' shows the pump diaphragm in the neutral position, ready for final assy of the cover. (the diaphragm is this picture is a used one for illustration purposes only)

'C-912 pump tool' the component parts. A piece of sheet metal, ~16 ga., 1" x 5 1/2", A piece of conduit, ~7/8" x 1 3/8" long and 4 bolts, 2, 45mm and 2, 75mm' and 2 hex nuts.

'C-912 clip tool' This holds the diaphragm in placed so the clip spring can be compressed and the clip removed.

'C-912 diaphragm set tool' To set the diaphragm in the neutral position so the top cover can be properly fitted.

'Tool held in vice' This is why there is a bend in the metal.

One final picture to illustrate what happens when the diaphragm in not properly centered. Note the wrinkle in the diaphragm, causing premature failure.

2 Comments

Profile missing thumb
Wm. H. Bill Webster
January 03, 2011 at 11:39 PM
Have you ever noticed that you don't get a shaft seal in the rebuild kits? I have researched and found an exact replacement seal. I have rebuilt two pumps in the last four years using this seal. You do have to "drift" the old seal out and make a crimping tool to secure the new seal... But it stops the oil from leaking out of the pump and it costs under $10.00 Bill Webster Member 1534
Profile missing thumb
Wm. H. Bill Webster
January 03, 2011 at 11:39 PM
Have you ever noticed that you don't get a shaft seal in the rebuild kits? I have researched and found an exact replacement seal. I have rebuilt two pumps in the last four years using this seal. You do have to "drift" the old seal out and make a crimping tool to secure the new seal... But it stops the oil from leaking out of the pump and it costs under $10.00 Bill Webster Member 1534