one carb not getting fuel [gl1000]

[jml74]

Carburetor #2 on my '77 GL1000 is not getting fuel, but the other three are and I'm not having any luck finding a diagram of the fuel circuit (not parts diagram) or even a picture that specifically calls out the fuel inlet. How should I go about troubleshooting this? There is what looks like a fuel line that goes from the carb body to the top of the plenum body, but is that the circuit for the air cut valve? If that line is the ACV, is there anywhere I can manually fill the bowl to see if that changes things?

[gltriker]

No. Injecting fuel into that regulated slow air hose completely bypasses the float set fuel inlet needle and seat, itself.
But, if you just need to know if that cylinder will respond to whatever volume of gasoline you would directly inject into the carburetor's fuel bowl through the slow air hose I reckon that would work


The link to information you seek is provided courtesy of Whiskerfish
https://www.ngwclub.com/forum/viewtopic.php?t=43640

[jml74]

Thanks. I looked in the tech tips sub, but I didn't realize there was one dedicated to drawings. I guess my next question is if 3/4 carbs are getting fuel, is there anything other than a stuck float needle that would be a likely cause of this? (If you can't tell, I'm trying to figure out if there is anything I can do before pulling the carb rack. )

[gltriker]

Is your suspicion confirmed by opening all 4 fuel bowl drain screws ?

[jml74]

Is your suspicion confirmed by opening all 4 fuel bowl drain screws ?

Yes, precisely

[gltriker]

Post#6

The "rack" has previously been removed, completely disassembled and lovingly refurbished with quality parts we presume?

[gltriker]

Carburetor #2 on my '77 GL1000 is not getting fuel, but the other three are and I'm not having any luck finding a diagram of the fuel circuit (not parts diagram) or even a picture that specifically calls out the fuel inlet. How should I go about troubleshooting this? There is what looks like a fuel line that goes from the carb body to the top of the plenum body, but is that the circuit for the air cut valve? If that line is the ACV, is there anywhere I can manually fill the bowl to see if that changes things?

viewtopic.php?t=78012&start=15 see my POST #18 1st photo - flattened and leaking - carb flange fuel inlet passage sealed connection to surface of plenum

[gltriker]

*Post#8

My trike's 1976 LTD spec carburetors.
Randakk kit rubber parts hold up well. Rust fines and other particulates will collect in the fuel inlet passage and clog the float valve seat filter screen. The float valve seat must be entirely removed from its carburetor casting in order to completely clean the very fine filter screen and entire length of fuel inlet passage.

Short cutting, instead, with Aerosol spray and air pressure is pointless.
@

20230723_123707 - coupled carbs #1 and #3.jpg

20230723_131228.jpg

20230723_135246.jpg

20230723_135833 - side view float seat and filter screen.jpg

20230723_135522 - end view of filter screen.jpg

And...
viewtopic.php?p=815982#p815982<<<Float Valve Set part number and photo of contents

[Fred Camper]

Often when a carb is not getting fuel, it is that float inlet screen that Cliff shows, is completely clogged.

[gltriker]

Post#10

Often when a carb is not getting fuel, it is that float inlet screen that Cliff shows, is completely clogged. there's countless stories of this unexpected discovery.

continue to scroll down to the next post (#11) in this Topic, contributed by redglbx , as well

RE: a thorough fuel tank cleaning
"And your carbs will thank you. They no longer live down stream from a sewage plant." -gregforesi

Best believe those words, too !! Fuel tank service and, Especially, multiple sessions of carburetor "rack" pull again and revisit their internals is an unquestionable Rite Of Passage with a new to you GL1000.

Wishin' and Hopin' and Thinkin' and Prayin' won't Fix 'em.

[redglbx]

Cliff, 100% agree ! Greg’s words are spot on ! I used to wonder where all the trash came from that collected in the float valve seat filter until I opened the fuel level arm hole in the tank and was shocked at at the stuff in the tank.

If you find yours to be contaminated pull the fuel level arm out and the on/off/reserve valve off the side. Pull the tank out the back and take it to a quality radiator shop so they can boil it out (clean) and maybe coat the inside so it doesn’t rust again. That’s where all that fine silt you find in the float filters and bowls comes from.

Sorry but you’re going to have to pull the carbs and take a look. If you decide to rebuild things get Randakks kit. Expensive, yes but their kits are made from Viton rubber which resists the alcohol in todays fuels as well as many other chemicals, well worth it !

[redglbx]

So jm174, just curious, when you opened the bowl drains you had no fuel come out of #2 ?