Is anyone using -4AN connectors in the fuel system?

[joe_db]

using these fittings, does one use thread sealant such as Permatex 2?

Yes - on the pipe thread end! Not the flare end.

[ndutton]

DON'T KNOW WHERE 45 DEG COMES INTO PLAY?

That is the machined angle on the flare end. They come in two flavors, 37° and 45°.

The responses are interesting. I've been using these fittings for 4 decades and advocating their use on this forum for nine years. Up until now the reactions haven't risen to the level of lukewarm or even blah, more like stone cold. I guess everyone preferred shredding the ID of their fuel hoses every time they pulled the system apart and sending the shavings downstream to create havoc inside their carburetors. I'm glad to see it is finally starting to gain a little traction.

[ArtJ]

I was thinking of using the connector to temporarily reroute
the output of the fuel/ water separator via a temporary hose out thru a porthole and back into the tank via the deck fill plate to re-filter fuel.
engine not running and blower on

This would require the facet pump to raise the fuel 4 ft . Is the head on the pump strong enough for this lift?

Alternatively, not sure how to connect into the rigid heavy large diam fill hose
and reluctant to attempt cutting a hole in ss tank.
Would this be safe enough for once a season usage?

Actually could use a larger version that accommodates larger hose than 1/4 inch quicker flow and direct connection to separator

Thanks
Art

[ndutton]

Art, you're looking at a polishing system and we already have a plan. You Tee the return fuel line to the tank vent plus a few other considerations. Check out this drawing:

[ArtJ]

Hi Neil

The only issue I have with the plan is that I don't have second port
into the tank and am reluctant to cut a hole.

[ronstory]

You don't have a vent line in your tank?

[ronstory]

That is the machined angle on the flare end. They come in two flavors, 37° and 45°.

The responses are interesting. I've been using these fittings for 4 decades and advocating their use on this forum for nine years. Up until now the reactions haven't risen to the level of lukewarm or even blah, more like stone cold. I guess everyone preferred shredding the ID of their fuel hoses every time they pulled the system apart and sending the shavings downstream to create havoc inside their carburetors. I'm glad to see it is finally starting to gain a little traction.

If you had only called them -4AN connections and not SAE... it all in the pitch.

[ArtJ]

You don't have a vent line in your tank?

No

I believe there is only the fill hose' the outlet and a gauge

[ronstory]

That's odd.

So how do you vent your tank? it there a branch off the fill line?

[ArtJ]

I think you are right there is a branch off the fill if memory serves me correctly
the boat is still covered for NE winter so I can't check right away.
If so, then that is where I could place a return hose connection T wiith shutoff

Thanks

UPDATE:

I know there is a vent because I recall the outlet above the fill cap area

[ronstory]

The McCarr folks are fast, just got my parts.

[ndutton]

Over the years I've used both Grainger and McMaster-Carr for industrial supplies. I prefer M-Carr by far.

[ArtJ]

A couple questions on different filters

How is during polishing, the water separator filter able to remove particles?
It seems as though everything just passes directly thru with only water settling into canister filter?


Regarding fittings too bad that in line filters don't come with fittings instead
of hose barbs so hose fragments could be minimized as well as easily exchanged

[ndutton]

How is during polishing, the water separator filter able to remove particles? It seems as though everything just passes directly thru with only water settling into canister filter?

The same as it does during normal engine running. A water separating filter separates water up to a point AND filters particles through an element.

Regarding fittings, too bad that in line filters don't come with fittings instead of hose barbs so hose fragments could be minimized as well as easily exchanged

The hose barbs on the inline filters are smooth formed bumps rather than sharp machined ridges so the hose is not damaged during removal.

[ArtJ]

Thanks Neil

One other question please when using the polishing system potentially
the return hose to the vent could accumulate residues during the non-use period which later could be recirculated into the tank via the return hose This would be potentially most danger of occurance when polished only once seasonally unless the return hose was disconnected and drained after use
or the slope of the run was downward ?



Perhaps boat heeling would drain the hose if under sail