Dan,

Both work and both have benefits and drawbacks. I’m currently set up to run back to the filter head, and I’m pretty resolved to keep it that way. I’m just weighing options while it’s still possible to do so.

It’s a brand new fuel tract. Right now, there’s nothing BUT air in it. And, when I close it all up, making all the connections, that air will be trapped. I’m just trying to expedite the process of getting it all out. I’d like to get as much out as I can before relying on the injectors to consume the rest.

It’s all good.

Thanks. Brad.

Not sure i’d worry about it, but you could purge it with a fuel psi tester that has a release. Put it’s clear line in a container of course.

No need to purge system. 43psi of fuel pressure running a return takes care of that. Also, once ejectors open air is released to cylinder. "self bleeding"

Can just bleed from the test port on the fuel rail. Could also use that port for your fuel rail pressure

The air is a non issue.
Don`t sweat it .
Agree with ROOKIE

Rookie,

48.5lbs, FWIW....

Holley HP, for reference, if it matters....

Do the injectors have an extended "open" moment at "key-on"? Or are we just relying on normal cycling duration to do the purging? I get that air undoubtedly escapes way faster than fuel, but it still has to happen while the injectors are open, and that's a LOT of air to get out of the lines and rails at first start-up, all of which is just being dumped back through the system over and over until it finds its way through an injector.

Thanks. Brad.

Buona Merda,

I don't currently have a Schrader valve, or provisions for one, on the rail. I've been running on the notion that having a FP gauge at the regulator would be sufficient. I can easily add an NPT bung to it, though. Maybe I should...?

Thanks. Brad.

You are way over complicating and over thinking this none issue.

Agreed. Just make sure your filter is full of fuel and send it.

That`s person #3 that agrees it`s not an issue yet you`re still going.
If you`re not going to believe the advice you get why bother asking the questions??.. dont be an askhole Brad

So just leave the hose off the fuel rail while you run the fuel pump .. then you only have this so terrible "air" only in the fuel rail.
Holley will "fuel prime" on key start .. it will only do it once untill it sees rpm.