Fuel Line Question

[kjohnson]

I have a 91 PS 190 and had to disconect the metal fuel line where it connects to the carbureator. I have had a lot of trouble getting the connection tight enough so that no fuel leaks out. Does anyone know if anything like pipe tape or some type of waterproofing that is used around the threads where the line connnects to the carbureator?

[MLA]

Metal fuel line connections on Carbs are typically a flare fitting, so the actual threads do not do any sealing. I would inspect both halves of the flares as well as the threads. If there is a nick or grove in the flare, or if its out of round, it will not seal. If the threads are not fully seating, they will get tight before the flare is tights. may need to replace those pieces.

[milkmania]

spit ballin' here
http://www2.cougarpartscatalog.com/muc1014.html

OR

http://www.speedwaymotors.com/Fuel-L...nder,2718.html

http://toolmonger.com/2009/03/02/har...-flaring-tool/

[broncotw]

Are you using teflon tape???

[thatsmrmastercraft]

While MLA is right in that a flared fitting shouldn't need any thread sealant, a wrap of teflon tape goes a long way to ensuring the fittings will thread together well and provide a leak-free connection. Inspecting the flare and fittings should be done every time a fuel line is removed.

[thatsmrmastercraft]

Originally Posted by TRBenj

Why would you recommend using teflon tape for a flared fitting? The threads are not part of the seal.

Post #5....

Originally Posted by thatsmrmastercraft

While MLA is right in that a flared fitting shouldn't need any thread sealant, a wrap of teflon tape goes a long way to ensuring the fittings will thread together well and provide a leak-free connection. Inspecting the flare and fittings should be done every time a fuel line is removed.

[kjohnson]

Originally Posted by broncotw

Are you using teflon tape???

It did not leak until I loosened it, so I don't think I damaged the line or flared end. Maybe I just need to take it to a boat mechanic.

I have not tried teflon tape. I tried that on a previous boat and it ended up partialling clogging the line.

[thatsmrmastercraft]

When using teflon tape, you just want to use a enough tape to cover the male threads on the fitting and not have any excess to clog things up. Wrap it counter-clockwise with a very little overlap so threading the fittings together doesn't dislodge the tape. Be sure to use a 1" wrench to hold the carb fitting while you tighten the line fitting. If you don't use a wrench on the large carb fitting, you will not get the connection tight enough and end up with a leak.

[TRBenj]

Originally Posted by thatsmrmastercraft

When using teflon tape, you just want to use a enough tape to cover the male threads on the fitting and not have any excess to clog things up. Wrap it counter-clockwise with a very little overlap so threading the fittings together doesn't dislodge the tape. Be sure to use a 1" wrench to hold the carb fitting while you tighten the line fitting. If you don't use a wrench on the large carb fitting, you will not get the connection tight enough and end up with a leak.

Why would you recommend using teflon tape for a flared fitting? The threads are not part of the seal.

[mcparadise]

Originally Posted by kjohnson

It did not leak until I loosened it, so I don't think I damaged the line or flared end. Maybe I just need to take it to a boat mechanic.

I have not tried teflon tape. I tried that on a previous boat and it ended up partialling clogging the line.

FWIW, the teflon tape for fuel is specific to that application according to my mechanic. i.e., it's a yellow vs white tape.....

Opsss missed gweaver's spot-on post..