Post by: FTR on May 21, 2025, 03:30:28 PM
Ive removed everything from the tank but I'm concerned about the return valve or whatever it is from the fuel pressure regulator. My bike is an 83 so has a spigot for the return pipe to be connected but the part inside the tank that this connects to is not removable as far as I can see, and I don't know what's in it. Would it be damaged by immersion in paint stripper, is there anything else in there that would make dipping it a bad idea?
Thanks in advance.
Post by: Laitch on May 21, 2025, 03:59:57 PM
Post by: FTR on May 21, 2025, 04:57:01 PM
Post by: Laitch on May 22, 2025, 11:39:25 AM
I thought all I could see is the hose spigot under the tank and just a cylindrical thing in the tank directly above the under tank spigot position. The in tank bit has no obvious features and nothing apparently removable. I will need to take another look tomorrow as now im doubting my own memory if you think there might be some sort of Jon return valve in there :(Don't let your heart be troubled.
The in-the-tank bit should just be the pipe. Early tanks had a check valve ball and spring assembly spliced into in the fuel return hose pipe beneath the tank floor so the pipe wouldn't leak fuel when the hose was removed from the fitting but in many Bricks the ball assembly buzzed so much the blasted spring and ball was removed. Later tanks just have the return pipe without the valve body under there.
(https://www.motobrick.com/gallery/4/1601-220525113325.png)
Post by: FTR on May 22, 2025, 11:50:51 AM
Attached is a photo of the inside of the tank directly above the pressure reg return. Sadly I can't get my hands in there sufficiently to feel around it and was puzzled as to what may contain. Need to invest in a dental mirror on a stick or similar.
Post by: Laitch on May 22, 2025, 12:30:23 PM
Thank you, really helpful.It shouldn't contain anything except an opening to the vast world below it. That's an excellent photo! let's have a photo taken from beneath the tank showing what's on the other side of the floor. Don't go to too much trouble though.
Sadly I can't get my hands in there sufficiently to feel around it and was puzzled as to what may contain. Need to invest in a dental mirror on a stick or similar.
Post by: Chaos on May 22, 2025, 01:21:45 PM
It shouldn't contain anything except an opening to the vast world below it.
Post by: daveson on May 23, 2025, 02:45:03 AM
IMG_20250523_162856.jpg (19.4 kB . 432x576 - viewed 324 times)
Post by: Laitch on May 23, 2025, 12:37:39 PM
As Laitch mentions, the cup arrangement seen on the inside only has an opening.The "cup arrangement" within the tank is a pipe with an internally threaded receiver for the check valve assembly attached to its lower end. It was pushed into the hole from the underside of the tank floor and welded into position. Viewed from the fuel cap opening, the weld bead joining the assembly to the floor can be seen at the base of the pipe.
Post by: FTR on May 23, 2025, 02:14:40 PM
I stripped all the gunk off the base of the tank and unscrewed the spigot from the underside and you are correct, nothing there to worry about so the tank is off being dipped/ stripped. Photo attached ... It came off very easily and there is a hole at the front (out of my view from the filler port)
Post by: Kaos on May 25, 2025, 12:26:35 PM
I had mine glassbeat blasted to strip it from paint.
Also have done one by hand, rough grid to very fine grid (was also the reason I got the other blasted) because its a good day worth of work.
I would recommend an unpainted tank, finished with clear satin 2k.
Post by: FTR on May 25, 2025, 04:24:30 PM
@Kaos - my tank has a bit of filler in it, so leaving it unpainted isn't going to be possible. I did think of leaving it bear - guess I could always get another tank ...
Post by: Laitch on May 27, 2025, 11:06:02 AM
On cleaning up the spigot thing its apparent that mine still has the ball bearing in it.If by "spigot thing" you mean the one you removed from beneath the tank, remove the ball bearing and the spring, if there was one. In the future, whenever you need to remove the tank or to replace that hose, the classic method is to remove the hose with one hand and shove a golf tee in the spigot opening with the other but if you don't play golf, you can always make a custom plug from a dowel, rubber stopper, etc. If you depressurize the tank before removing the hose, there is not much fuel loss to trouble you, unless you're smoking a cigar. That's one reason why vaping has become popular. :laughing4-giggles:
Post by: FTR on May 28, 2025, 04:17:01 PM
Post by: Laitch on May 28, 2025, 07:55:06 PM
Post by: Duckbubbles on May 29, 2025, 09:39:05 AM
If by "spigot thing" you mean the one you removed from beneath the tank, remove the ball bearing and the spring, if there was one. In the future, whenever you need to remove the tank or to replace that hose, the classic method is to remove the hose with one hand and shove a golf tee in the spigot opening with the other but if you don't play golf, you can always make a custom plug from a dowel, rubber stopper, etc. If you depressurize the tank before removing the hose, there is not much fuel loss to trouble you, unless you're smoking a cigar. That's one reason why vaping has become popular. :laughing4-giggles:
I think the best solution is to get a couple of straight fuel line quick disconnects from Beemer Boneyard and install them. Took me 20+ years to figure this out. Install them opposite each other so they can't be connected wrong.
The ball bearing in the spigot caused a rattling/hammering sound in early K100's and was removed on later models as far as I know.
Frank