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fuel starvation/bad gas mileage

  • Thread starter Thread starter davidduarte
  • Start date Start date
here's the new petcock, with the old one for comparison:

DSC05236.jpg


DSC05235.jpg
 
perhaps one of the more technically savvy members could comment on this. The petcock is essentially a valve through which the fuel flows from tank to carbs, but it only flows when there is vacuum, right? That's what the other line on the petcock is for, to connect to a vacuum line on the carb.
 
davidduarte said:
perhaps one of the more technically savvy members could comment on this. The petcock is essentially a valve through which the fuel flows from tank to carbs, but it only flows when there is vacuum, right? That's what the other line on the petcock is for, to connect to a vacuum line on the carb.
Click to expand...

Hi,

Yes, that's correct. I think you get your vacuum from the left carb, that nipple there on the outside. The other two nipples above the idle adjuster are for vent hoses.

Great thread, nice work!

EDIT: I just noticed your last post was a week ago. Did you move to a new section? Lemme check. ;)


Thank you for your indulgence,

BassCliff
 
Nope, I'm still here in this section :) I got my tank back yesterday, I'll post some pics tonight. If I can, I'll go ahead and put it back on the bike tonight, but I have to wait for the liner to cure before I put gas in it.
 
The dumb things I do when I'm tired. I went to put the tank on last night, and tried to hook the line from the carbs to the vacuum port on the petcock, and from the vacuum port on the left carb to the gas line on the petcock :oops: So I'll have to stop somewhere to get a new vacuum line, as the gas line is too big.
 
Here's the before shot of the inside of the tank:

DSC05144.jpg


here's what the inside of the tank looks like now:

DSC05346.jpg


DSC05345.jpg


As I was told by one local shop I called to inquire about tank de-rusting/sealing, it looks like the tank has been coated with raspberry jam. I picked up some vacuum hose yesterday, just have to put that in and connect the gas line, and wait for the liner to cure. So close...
 
Last edited:
It figures, I get the bike back together, and the battery doesn't have enough juice to turn the starter. I'll check it again in the morning, but I think I need a new battery.
 
Got new battery at Sears today, put in battery acid, let it charge all day. It was charged even before I left for work at 3:30, and when I got home tonight at 10:30, I put said battery in bike, hooked everything up. Filled up the tank, hit the starter button and...nothing. Tried it with the choke, without the choke, throttle wide open, midway, and completely let go of it, but still nothing. Also tried with the petcock both on reserve and on, and still nothing. I wonder if there's no gas getting through to the cylinders? Help!
 
this morning, I took another crack at it. Still wouldn't start, but then I checked the gas line, and there was a kink in it. So, I trimmed it back until the kink was gone, and after a few tries, got the bike started. I changed the oil, checked the pressure in the tires, and took it out for a ride. :D Much rejoicing!
 
83 gs750es

83 gs750es

i have a 83 gs750es that boggs at about 1/4 throttle its got a 4into 1 and air filter pods
 
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