Problematic M35A3 Fuel Tank Check Valve

Couldn't start my nicest A3 today... wasn't getting fuel.

From previous experience I pulled the check valve on the top of the fuel tank
(Item 24, Fig 30, TM9-2320-386-24p, page 0031-00) and found the brass plunger gunked up badly, and the O ring a bit mangled. Cleaned and reinstalled it and the truck started in seconds.

This is the third A3 that's failed to start for me until that check valve was removed. I see on some of my trucks that it's been removed previously. Seems to be a common problem.

A couple questions:

1. Who has spares of this part?
2. Is there a better alternative? I think a check valve is somewhat important because the A3 doesn't have an in-tank pump.... just a lift pump that sucks fuel up out of the tank. The valve prevents that fuel from draining back on shutoff. Don't know what problems draining would cause.
3. Does anybody know the dimensions of the O ring in that check valve? It doesn't match any O ring in my GI O ring selections.

Bottom line for all A3 owners is that this check valve is a failry common problem with an A3, although not horribly difficult to cure when you get it clean enough to see the clip holding the check in it's body.

Thanks much.

Mark

Thanks for the info, Mark. First time I have heard of it! Guess this better get put on my list.

When my A3 wouldn't start at Warner Robbins this was the problem. All A3 owners make note of this. It would be great if someone could take a picture of one of these pulled apart for future reference.

I've got a couple trucks that haven't had that clog fixed... I'll clean them as a routine task and send pics when I get back in country.

For whatever its worth whenever you need a new one & dont want to be bothered with drama from Davco, and/or Specialty Mfg Co, McMaster Part# 7768K68

Didn't even pull mine apart. Just take the fuel hose off the elbow, using two wrenches apposed, Spray brake cleaner in one end, let sit, work the valve. Spray it in the other end, let sit, work the valve with a wooden rod. All fixed. I didn't even need to prime.