Mac 7- 10 fuel line instal

[Mike Ray]

Trying to restore a mac 7 - 10 a going to use seal all on gas tank gasket as someone had it the tank off I suppose, and I am going to use a new gasket, and fuel line. Should I use seal all on the fuel line where it goes into the case?

 

[Vorhi-heesy1985]

Trying to restore a mac 7 - 10 a going to use seal all on gas tank gasket as someone had it the tank off I suppose, and I am going to use a new gasket, and fuel line. Should I use seal all on the fuel line where it goes into the case?

I know this is an old post but I'd avoid using Seal-All on the fuel line itself. Engine vibration will eventually crack the sealant and an air leak there can lean out the saw and cook the piston. The correct method is to obtain a properly sized diameter of quality ethanol-resistant fuel line for a tight press fit seal. What was the outcome of your project?

 

[JJoe_257]

Trying to restore a mac 7 - 10 a going to use seal all on gas tank gasket as someone had it the tank off I suppose, and I am going to use a new gasket, and fuel line. Should I use seal all on the fuel line where it goes into the case?

I'm with @Vorhi-heesy1985, definitely don't use Seal-All on the fuel line where it goes into the case.
As he said, it will just crack and cause problems down the road..
The original line was a specific diameter for a press fit and that's the way to go, and make sure you get quality, ethanol-resistant line, as the old stuff will just crumble.
You can use a little oil or grease on the end and a pair of needle-nose pliers to help get the new line threaded in easier.
But honestly, I'd be more concerned about the gasket on the tank..
If the surface isn't perfectly clean and flat, you'll have issues.
If the original gasket is cork, I'd probably use a thin layer of a fuel-resistant sealant on both sides to be safe.