Changing the line fitting o-rings on a Mercury gas tank

[billw]

How about you guys? I didn’t get any response on John’s old Mercury site, which is unbelievable. I want to replace the rock hard o-rings in my metal, six gallon, single line, Mercury gas tank. This is not as easy as it sounds. I figured out that I need dash 111 o-rings but how to get them in there is a challenge. Is that fitting pressed together? Screwed together? Anybody ever tried this? Thanks

Bill

Long live American manufacturing!

[opposedtwin]

Bill I’m glad you asked this question. Sorry I don’t have an answer but I look forward to any advice someone can give. Dave B has probably come across this question or has possibly even tried it.

I’m pretty sure they still sell the whole fitting. I’ll bet most people just get the entire fitting.

[sailor58]

I noodled around on the innanet one night for a couple hours looking for the same info. I even cut an old one apart to see how it was assembled. Then I bought a new fitting…
Larry

[billw]

I’m homing in on it. I ordered dash 111 Viton o-rings, only to find they were too small. They are not thick enough. They are the same size as the ones I took out, that shrunk!! I have some dash 205s coming for tomorrow that I hope are right.

I figured out how to relieve the spring tension on the check ball, so you can work the o-rings: You pull the unit out of the tank and unscrew the pick-up tube. Then, push in on the ball and stick a small screw driver in the inlet tube mounting hole, to catch and hold the compressed spring. You are then free to work on the o-rings without the check ball being in the way. More tomorrow, when the hopefully proper o-rings come.

I made a cut-away of a female, fuel line end, which is similar in construction, so I could see how it was made. It is a press-fit and tight; so you don’t want to go trying to turn it or pull at it, because I believe it will break the little tabs that retain the male end…….

Long live American manufacturing!

[beerman57]

Are we talking about the 2 line fitting from the the tank to the motor? I think I asked how to change the Oring in a Merc connector a LONG time ago and got no response, if I remember right. I would guess you depress the "plunger?", dig out the old Oring, lube up a new Oring and I’ll bet it slips right in. Kind of like changing the Oring in an OMC shift shaft housing.

[billw]

I’m talking about the single line fitting that you push in and twist, to lock. There are two o-rings in there, separated by a floating washer. The first one is pretty easy but the second one was a problem, until I figured out the trick to holding the ball back, above.

Long live American manufacturing!

[billw]

The dash 205 o-rings are the ones. I greased -em up a little and they went in with some finagling. The trick is definetly holding the spring back, through the pick-up tube hole.

Long live American manufacturing!

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