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Fuel Delivery?

  • Thread starter Thread starter c0okiez
  • Start date Start date
C

c0okiez

Guest
So, back again with more issues with the GS550e. I believe the reason its not running right and idling for more than 10 seconds has to do with the fuel delivery to the carbs. Issue: with the float bowl drain plug removed, and petcock set to "prime" the fuel flows straight through the carb(s) and into a container. However, when set to On/Reserve (with the plug still out) not a single drop even lands in the "catch" container. Possibly a vacuum issue? Possibly a petcock issue?

The lines appear to be hooked up correctly, the carb with the fuel line has the vacuum line attached to the petcock and it appears to be creating vacuum, when i unhook and place my hand on the line.
 
Hi,

Have you tested the petcock?

Disconnect the vacuum line from the carb, leave it connected to the petcock. Take the fuel line from the petcock and direct the output to an external container. Set the petcock to 'ON' and apply your own vacuum (suck on it). Does fuel flow from the petcock into your external container?


Thank you for your indulgence,

BassCliff
 
i tested it. at first i sucked as hard as possible, and nothing. then when i tried a second time it started flowing. Possible clog? I had to suck extremely hard, and i doubt the vacuum line provides as much pressure as i did to get it going. any suggestions?
 
Its easy to take apart the petcock and see how it works, thats what I would do.
 
Hi,

From your "mega-welcome":

Top 10:
7. Petcock (install a NEW one)

Top 15:
13) Install new petcock, since I'm going to head to the roof with a rifle if I have to read about yet another #2 plug fouling and failed hillbilly attempts to rebuild the petcock and/or deny there's a problem.

Now it's your bike, you do what you want. But if you replace the petcock you won't have to worry about it for another 25 years or so.



Thank you for your indulgence,

BassCliff
 
c0okiez said:
i tested it. at first i sucked as hard as possible, and nothing. then when i tried a second time it started flowing. Possible clog? I had to suck extremely hard, and i doubt the vacuum line provides as much pressure as i did to get it going. any suggestions?
Click to expand...
Yes, take Basscliff's advice and eliminate the petcock as a problem.
 
c0okiez said:
The lines appear to be hooked up correctly, the carb with the fuel line has the vacuum line attached to the petcock and it appears to be creating vacuum, when i unhook and place my hand on the line.
Click to expand...

Just to be clear

The fuel line goes to the T between carbs 2-3

The vacuum line goes on the top front of carb #2

Have you tried starting it with the petcock set on Prime? Does it still stop after 10 seconds?
 
i dont have the 4-carb set up. its the two-barrel. but now it doesnt even want to crank over or stay running for 1 second with it set to prime or on/res. its either not getting fuel, or just not getting a spark.
 
Hi,

If you have a spare plug, take a plug cap off and plug it in. Then lay it on the head (to ground it). Crank the motor. See if you get spark.


Thank you for your indulgence,

BassCliff
 
c0okiez said:
i dont have the 4-carb set up. its the two-barrel. but now it doesnt even want to crank over or stay running for 1 second with it set to prime or on/res. its either not getting fuel, or just not getting a spark.
Click to expand...

I forgot about that

I'd be checking the plugs for spark . Pull 1 and 4, plug them into the caps and lay on the head. Turn off the lights and hit the starter button. Red? Yellow? Blue? White?
 
Hi,

That aftermarket petcock looks like it has the fuel and vacuum nipples on the opposite side of the OEM part.

Partshark.com lists a new OEM petcock for $77.87, part# 44300-43461. GSSuzuki.com lists it for $72.56. Cyclepartsnation.com lists it for $75.69.

According to a cross-reference, the '83-'86 GS550E(ES, EF, etc) all use the same petcock.

That Ebay petcock might work OK if there is room to route the hoses without getting pinched. Another option would be to see if there is a Pingel petcock that fits properly (perhaps with an adapter). Note that the Pingel units are not vacuum operated petcocks and you would have to remember to TURN IT OFF every time you got off the bike. If you go that routhe, give Z1Enterprises.com a call and see if they can help you.


Thank you for your indulgence,

BassCliff
 
i can always count on you cliff =) thanks. I guess while i'm going ahead and ordering everything, i kind of want to replace the spark plug wires and caps just to rule some more stuff out. Any special site i need to order them from?
 
You can open the petcock you have and check it out.
It is worthwhile doing especially if you have decided to buy a new one.

Four screws on the backside will reveal the diaphraghm.
There is some screws so be careful.

It could be as simple as a light cleaning.
Prett easy thing to at least check and clean.
Yhing may just be gummed up after all.
 
yeah, that's what i planned on doing. never hurts just to check. but i will be buying a new one just to be on the safe side. what about places to purchase new plug wires? have any idea?
 
JEEPRUSTY said:
You can open the petcock you have and check it out.
It is worthwhile doing especially if you have decided to buy a new one.

Four screws on the backside will reveal the diaphraghm.
There is some screws so be careful.

It could be as simple as a light cleaning.
Prett easy thing to at least check and clean.
Yhing may just be gummed up after all.
Click to expand...

I think you meant "springs", but absolutely, I'm a big fan of trying to fix it before replacing it.
 
Adler said:
I think you meant "springs", but absolutely, I'm a big fan of trying to fix it before replacing it.
Click to expand...


yah I meant springs.

There is a plastic cone that turns in the petcock body.
You can remove it but under no circum,stances remove the spring steel doo dad underneath it.
You will cry in despair of getting it reinserted and ou can twist it out of shape thus ruining the whoe works.
 
hah alright, ill avoid that little guy. what about new wires for the plugs?
 
Oh and while I am thinking about this.
Do you guys know that a petcocks prime position flows less than it on position?

Its true the hole in the petcock for the Prime position is signifigantly smaller than the ON.

I assume at high RPM running this would affect fuel delivey by being a possible source of starvation.
 
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