leaking ve pump

[ledsel]

I have a 91 dodge cummins in my 85 Ford motorhome and it started to leak fuel out of the vent on the back of the smoke valve body. What would be the problem?

[randyswelding]

it is most likely the pin that the afc cone rides on there is a small green oring in there,there are some forms and i think a sticky on how to replace it on the dtr,hope that helps if you need to know how give me a little bit of time and i got to redo mine its leakin there again

[ledsel]

So is this a common problem? I read somewhere that a person should remove the vent once a year and squirt some wd40 in there. Can you get at it if you remove the diaphragm and pull out the cone? It's very tight on this truck to get at the rear of the pump. I see the pin on a diagram but I didn't think there was a o-ring on there as I thought it woud make the pin too tight.

[randyswelding]

if you look insid the boar where the pin goes in you will see the afc pin and thats where its leakin
http://www.dieseltruckresource.com/dev/ ... p?t=153154
try this