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mikeadair

Fuel issue

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mikeadair

I recently purchased a 1996 GL 1500 SE that had sat awhile. I would run on choke, but no hesitation or bogging. I put some seafoam in the gas tank (1.5 oz) and sprayed some carb cleaner directly into the carbs. I got it running (idling) off choke, but it was surging. I think there was one clogged idle jet. I then sprayed a lot of carb cleaner (soaked) the carbs and held my palm over each carb to manually choke them and try to get them to suck some of the dirt out. I let it sit for awhile with carb cleaner. When I came back an hour or so later to try it again, there was no fuel entering the carbs. I checked the fuel pump for power with a check light and it lit up. I disconnected the fuel line from the fuel filter and ran it to a cup while turning the engine over. A seemingly small amount of fuel was coming out of the hose....trickling...kind of. It filled the hose up to the filter, but seems to be taking a long time. Before this I also rebuilt the petcock and put a new fuel filter in. Any ideas? This is my first post. Thanks in advance.

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mikeadair

Just went out and tried running the fuel pump hose into a cup again. It seems to be pumping enough volume. Then I took the gas cap off, put on full choke and it started for about 20 seconds. Would die when I gave it gas. Weird.

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OnaWingandaPrayer

The "choke" lever is actually an enrichment circuit . It allows more fuel to be drawn. Is it possible when you had it running at full choke that it flooded and stalled . Will it run with no choke?

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mikeadair

May have stalled when I was loading it with carb cleaner and flooded, but that was last Sunday. It won't start since. I see no gas going into the carbs. It will run on spray.

 

Currently playing with it. I tried taking off the gas cap and put on full choke. It started for about 15-20 secs twice, but would stall, if I try to give it gas.

 

I'm checking all the hoses one at a time from the fuel pump. I got up to the petcock and fuel was being pumped to there. No fuel coming out of the petcock. I just rebuilt it, but I guess I'll take it apart and have a look. It's not leaking.

 

Some kind of blockage, I'm thinking.

 

Thanks for the input.

 

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OnaWingandaPrayer

I believe your refering to the diaphragm fuel cut off . You can bypass that for testing. The pump should fill the carbs. If you have a vacuum leak to the cut off valve it will not open and allow fuel to the carb bowls. If I recall correctly the vacuum hose for the cut off valve is run from the rear intake runner on the left side of the engine. That hose has a sharp bend and is known to split . That could be some of the problem.

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mikeadair

Thanks. I'll look into that tonight.

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mikeadair

I bypassed the dyaphragm fuel cut off and it fired up. I can't find any splits in the vacuum line. I see the one you're talking about entering the manifold. Looks OK. Should I replace all of them to be sure?

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OnaWingandaPrayer

Do you have a vacuum pump, like many folks use to bleed brakes. If you do , you could use that to pull vacuum on the petcock/ cutoff valve. Then you know the valve is operating correctly and you need to find where the vacuum is leaking. I'll look to see if I have a diagram of the vacuum lines and be sure I told you the correct line to check.

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mikeadair

I don't have a vacuum pump, but I put the petcock back in the fuel line and the bike still runs.....poorly. I currently have the air box off. That has some vacuum lines that are now disconnected. Could that effect it?

 

I'll try to pick up a vacuum pump this weekend. Is it simple - like a ball you squeeze with a hose on it?

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OnaWingandaPrayer

 The pump I am thinking of has a pistol grip . It comes with a catch canister and tubing, adapters for bleeding brakes. PepBoy,AutoZone etc should have them . Some stores may even have a loaner (for a deposit).

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OnaWingandaPrayer

I was able to locate the tubing map and confirm by looking on an engine , but my book and engine are 93/94 models. Your 96 may be different. 

What I found is tube(hose) #12 from the vacuum shut off valve comes down to a steel pipe manifold on the left side of the engine. At the rear left intake runner 3 steel tubes run behind the runners. These steel tubes go forward. #12 branches off of a "T" at the center left intake runner. That short hose is #1 and makes a "U" turn to connect to the center left intake runner. Forward of the "T" this line goes to a one way valve(checkvalve) , then to an accumulator tank. Again this is info from a 93/94 service book/engine.

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mikeadair

Thank you for your help, Mr. OnaWingandaPrayer

 

So I've been working on this bike for four months or so......

I have it running pretty decently, but still have a problem.

 

I have a slight surge of 250 rpm after warm up. I've noticed the slide on the right side carb is not moving when I "juice" the throttle. Probably connected.

 

So far I've cleaned the carbs - high and low speed jets and idle jets - blew the carbs out with air and sprayed a lot of carb cleaner and sea foam in them.

Rebuilt the vacuum shut off valve. New carb boots. New fuel filter. Replaced a number of vacuum hoses. Checked many more. I bought a vacuum brake bleeder, like you recommended, and have been using that.

 

Problem seems to be with just the right side carb now. I think if I could get the slider to function, that may fix it.

 

I'm very close. Any more ideas?

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