460 requires cranking after sitting

[85lebaront2]

Read what he said, that is why I mentioned the gas fumes in the air cleaner. He pulled the air cleaner and checked the fuel levels on the sight glasses and when he tried a hot start it fired right up.

[kramttocs]

You guys are great.

The quickfuel has the angled top vents that go into the air cleaner.

I'll add that to my test list - after sitting hot, pop the hood, remove the air cleaner lid and try.

This evening I'll remove the separator. I've never taken one apart to know how they work but you're saying I should be able to blow in the top port (the one on the side of it) and air should come out the two ends?

Should I be able to blow in any port and air come out the others or is there some baffle/restriction that would be expected?

[kramttocs]

Also, I didn't think of this before and don't suspect this matters but the truck came with a K&N air cleaner filter and that is what is still in there. Only mentioning it in case it might hold the fumes in more than a typical one.

[Gary Lewis]

Bill - You are right, he's sorta done that test.  But, maybe not on purpose?

Scott - I have an extra one of those separators if you need it, no cost.  But, in reality I'd put a return-style pressure regulator on in its place.  And I have one of those, NIB.  Yours for half of new price if you want it.

[Gary Lewis]

The K&N might hold fumes better than a paper filter.

As for blowing into the separator, the outlet to the return is just an orifice.  So you should be able to blow through easily inlet to outlet or reverse, but inlet or outlet to return should be restricted.

[ArdWrknTrk]

There's a screen in there that can get sludged up.
And there is a defined orifice in the return end.
.045, .065, or .090 for trucks having vapor lock that need more fuel circulating from the cool reserve in the tank.
These are colour coded with a red, blue or white dot on the canister.

[Gary Lewis]

That's what I'm thinking has happened - the screen is plugged.

I'll look to see what size mine is.

[ArdWrknTrk]

Well, the screen plugged would effect the carb filling too.

But the orifice could be.
Or the return line...

It couldn't hurt to blow them all out.

[Gary Lewis]

I don't see any dots or #'s on mine.  But I can blow through it all three ways, so it isn't clogged.  And I'm not going to use it so it is free to a good home.  

[85lebaront2]

Mine didn't have a screen in the separator, it had a "filter" screen in the bowl inlet (try to find one, it took me about 2 weeks to track down a replacement). I never looked for a color dot and have no idea what size orifice it had.

Here is a pretty good shot of the bowl vents on Darth, notice the size and the vacuum operated valves in the lines. They are closed with the engine running and open with it off.

[kramttocs]

Great info guys.
Thanks Gary - I appreciate that on both items. Let me see what I find out tonight with blowing through mine.

I am pretty sure mine had a white dot on it but not positive.

Bill - never thought about it before this issue but I can see the benefit of venting outside the air cleaner like that.

[ArdWrknTrk]

IKR!?

I kept getting sintered brass 'Stones' and not the little thimble screen I wanted.
I'm sure if I dig back into my truck file folder I have the box tab with that part noted, and all crosses available at the time.

[kramttocs]

Friday night I took the separator off and blew it out. The screen inside looked pretty clean but after blowing backwards through it a bit it did seem to allow air through it better.
Put it back on and the handful of times I've started and stopped it the psi dropped to 2 and then after a bit, to 0. I've never really paid much attention before this so I don't know if blowing it out took care of it or if the major psi increase I reported earlier was just a one off and unfortunate coincidence. Will keep an eye on it though.
Haven't done any real testing on the start after soak scenarios but will report back on any findings.