Anti siphon valve……

[steplift20]

I dought its the anti Siffon valve fitting, if you loosened the fuel cap and still had the problem then I would look for another issue . I think your over thinking the problem
Think of this. The fuel goes from the tank to the engine using a hose so if your bulb is callapsing that means there is a blockage Change the primer ball. See if you can pull the pickup tube out of the rank, their might be blockage on the end of the tube. Last but not least. Change the fuel line You might have something floating in the fuel tank that gets caught on the tube. .
Try running it on a portable fuel tank and see if it goes away. If you still have the problem than wait for Spareparts .

[charlie_the_tuna]

Only way to get at tank pickup tube is to pull anti siphon valve.

[steplift20]

Hmm, I think I saw a fuel cap that is also a vent built into it, but I'm not sure. Check google or wait for Spareparts
Hey Charlie I'm not on Facebook anymore, I don't know how to delete my Facebook so I unfriended everyone,
The best thing I did. Why don't you try running it on a portable fuel tank? That will narrow it down . If it still callapsing then the primer ball is the enemy.

[charlie_the_tuna]

I also remember seeing a bunch of crap on the bottom of the tank after we pumped it out. Didn’t get a real good look because we had to peak through the hole for the sender. From what I could see, there was a ton of grit and sediment on the tank floor. This leads me to believe it could very well be the pickup. I got the whole fitting to turn a bit yesterday which is what I don’t want. I’m gonna put a large adjustable wrench on the fitting itself and a smaller wrench on the actual valve and see if I can crack it like that. Probably shoot it with penetrant a couple more days as I’ve already missed this weekend anyway. Also, I’m gonna drive out east again and swap out the new rod I bought for a different, slightly more expensive one. Then, another $30 or so bucks for line and braid. At this rate, I’ll be fishing again around 2026.

[steplift20]

Charlie the tune. I used to Fish every weekend Every Week End. Than I bought a boat , the rest is history.
Now I fish once a month and work on my boat. Every week end. Every Week End. Got it?

[Blue_Runner]

I went through all that and after I replace the fuel line from tank back to the motor my issues went away for good.

[steplift20]

Hey Blue, I hear you but Charlie says it's very difficult to replace the fuel line and he also said there is a lot of crud I. The bottom of the tank . That's the enemy
1st. Replace the fuel line
2nd remove the fuel and clean the inside of the tank
Or like I advise him. Run it on a portable tank and see what happens.

[spareparts]

from my experience, do it all and be done with it. Pull the pickup from the tank, replace it, if its got a plastic tube, they work loose at the aluminum fitting and suck air. Install a new anti siphon valve(lowest vacuum setting you can find), run new fuel line, install a new water separating fuel filter, new fuel line to teh primer bulb, new line from teh bulb to teh engine. If the engine has a quick disconnect, remove it and plumb teh fuel line directly to teh fuel filter on teh engine. 2-3 hours labor