Fuel lines, hard or soft. What is the general sense on fuel lines?

Shurkey, PM me if you want to get into the Nylon fuel line details for your boat. I have a few items on my list of "lessons learned" and can cast some light on the steel endform details, as well as insertion depths and percentages of Nylon expansion for a robust joint. The typical OEM fixtured insertions usually require some special tools and may be overkill depending on what you're up to.

Devon

 

I AM interested--but--I routed miles of Synflex fiber-reinforced nylon tubing at the bus plant; it's easy to work with and uses simple, easy brass compression fittings and brass or steel reinforcing sleeves.

I don't have any experience with Synflex in a gasoline environment; so I'll have to do some research there. I think it's gasoline- and alcohol-safe. We did use it for Diesel fuel; and most of it was compressed air applications at ~120 psi.

I did one job with OEM nylon fuel tubing; the stuff was so expensive I might as well just buy the steel-braid-over-Teflon as use the OEM stuff. Maybe I didn't buy from the right parts store...

 

Well I think I found the whole problem.

Dam vent line isn't venting, can't even blow through it.
I didn't plug it, maybe since it still original steel its collasped on itself or something?

Dunno where it runs to anymore, done got ride of the charcoal canister long ago.

Any suggestion on what to do with it?

Run a short section of line to a filter or something and let it just vent free or find some type of 1 way valve???

 

On my 70 there is a vent on the right side of the tank. You just run a short rubber hose from the vent up the backside of the trunk floor. There is a clip there for it. Want to be real cool run a little filter on it but I don't.

? Are you talking vent or return line?

 

Vent, ya know 80s EPA crap vent use to run all the way forward.


Well that was an all day event, drop the tank, check pickup/sending unit, yank all the rubber lines, install new steel.

Course who knows now what it was, the line or the vent but n e who its all better now.

No more nosing over in power at the top of a shift going WOT.

I now gotta play with timing again as I took some out a few times to try and help.


Course then I had more work to do. Had a 3-4in nub of some rusted flex pipe sticking out of my exhaust, was to run it al lthe way back both pieces rusted out n fell off. So the exhaust was dumping right before the axle.

So I removed the two small nubs left and you have no idea what a difference them two small numbs made. With them gone it was unbearable to ride in the car. Was deafening. Had to stop and pick up a couple of short lengths of pipe to extend it just a bit more and no more wanting to drive with my hands over my ears.....

 

Let's put our thinking caps on.

The original fuel pump was intended to vent vapor (and some minimal amount of LIQUID gasoline into a small-diameter (1/4" tubing) return system which EMPTIED BACK INTO THE GAS TANK.

You try to "just vent free" and you're going to be spraying gasoline on the ground.

You try to run this forward into the charcoal canister (which, for reasons that I can't fathom--you got rid of) and you'll flood the charcoal which was never intended to absorb LIQUID gasoline.

You need to either plug the vapor vent fitting on the pump--which will hurt nothing; will help nothing; but may lead to vapor lock issues, OR you need to re-plumb a return system that dumps back into the gas tank--which is itself vented somewhere. The tank vent will be either a vented gas cap; or more likely some other tubing/hose dealie in the back of the car--but--the gas tank vent will not be intended to vent both vapor and LIQUID gasoline.

 

You needed to re-read some parts,

I have a non AC car fuelpump now, so I have no return line anymore.
Only AC cars had it for my year. Don't have AC anymore n e ways.

The car has a 3 line pick up, feed, return, vent, the vent line ran up the frame into the charcoal canister at some time. Its only a vent line.

And I no longer have a canister but can't remember what was done with the vent line or could find it under the hood. But it was gone well before any problems. Since its still using the original line [all the rest done rusted to dust years ago] some how the vent line must of got plugged off. Maybe rust, maybe a bug crawled in and died.

 

My bad. Got confused between "vent" and "return" plumbing.