Question about 1985 Honda VT 500 C Shadow

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If you dont use the original style you will flood the carbs every time. the vac style on this bike has metered flow for these carbs

Posted on Sep 06, 2010

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Have suzuki ls650 will run on reserve but will quit if i put the petcock in normal position

Hi best thing to do is to remove the tank first drain all the gas out into a safe gas can then remove the petcock and clean it making sure the tube and or internal filter are free of sedement the tube and passage ways are unblocked thats why no fuel is flowing in the on position.

Oct 27, 2012 | Suzuki LS 650 Savage Motorcycles

1 Answer

Gas not getting to carb. 1995 softail stock

Hi Anonymous, and the usual suspects are:
1. No fuel in gas tank.
2. Fuel valve not switched to on or reserve.
3. Fuel cap not venting properly.
4. Fuel filter clogged.
5. Vacuum line broken, cracked or not connected to petcock or intake manifold.
6. Fuel valve diaphram faulty.
7. Fuel line to carburator blocked or kinked.
8. Float valve needle stuck to seat.
Good luck.

Sep 27, 2012 | Harley Davidson Motorcycles

1 Answer

No fuel getting to carbs

If you have a vacuum operated fuel petcock, it should also have a "prime" position. That should let the fuel flow without vacuum from the engine. If this solves your fuel starvation problem, I would double-check to see whether the the replacement petcock gasket(s) may have shifted just enough to block some little pinhole that's required for vacuum equalization. That has happened to me--the replacement gaskets aren't exactly the same as what was originally in there.
You can also test the vacuum release of the fuel petcock without taking anything apart. Put a mity-vac (a hand-pumped vacuum pump) on the vac line to the fuel petcock and see whether you can get the fuel to flow. Harbor Freight sells a cheap mity-vac type pump for under $20 when it goes on sale (which it does regularly).
Good luck!

Dec 06, 2011 | 1982 Suzuki Gs 550 L

1 Answer

My cpi gtr 50 won't take in fuel i've cleaned the carb n the fuel but nott'n happens line

Hi, Kaleovidinha always check the fuel flow first to isolate the problem area otherwise the usual suspects are:
1. Fuel tank empty.
2. Fuel cap or fuel tank not venting properly.
3. Fuel filter clogged with rust or dirt.
4. Fuel valve/petcock not in the on or reserve position.
5. Vacuum line to fuel valve cracked, broken, pinched, or missing
6. Fuel valve/petcock clogged or diaphragm cracked, cut or torn
7. Fuel line from the fuel valve to the carburetor or fuel pump clogged, cracked, pinched, bent, broken, or missing.
8. Fuel pump not working
9. Fuel line touching cylinder or head causing fuel to boil and vapor lock, repair by rerouting and wrapping line with convoluted tubing.
10. Carburetor inlet clogged.
11. Carburetor float or needle and seat stuck.
12. Carburetor not venting properly overflow line or bowl fitting clogged, pinched, or bent.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
Fuel and Vac Line Tutorial
scooter not getting gas
CPI GTR 50 Service Manual
CPI Scooter Parts Racing Planet USA
CPI GTR 50 2009

Aug 27, 2011 | 2009 Cpi GTR 50

1 Answer

Seems to be a fuel problem, fuel not getting thru to cylinders but runs on easy-start (did this to eliminate poss. electrics problem) fuel tank full and switched on !!!

Don't use too much of the starter fluid. This stuff is bad on an engine as it can crack cylinder heads and pistons. Check the fuel petcock on your fuel tank. In 1996, Harley went to a vacuum controlled fuel petcock and they do give troubles. To check it, pul the fuel line off at either the petcock or the carburetor fuel inlet. Turn the switch on and spin the engine. You should see a good stream of fuel come out of the hose or the petcock. If not, check to make sure the vacuum line is hooked up to the backside of the petcock. If it is, you may have a hole in the diaphragm in the petcock. You must loosen the petcock and allow the fuel to drain out of the tank. Catch it with a large funnel and an empty fuel can. Take the petcock out of the tank and take the plate off the backside of the petcock. There's a needle and diaphragm under the plate. Notice how it comes out so you can put it all back together. Hold the diaphragm up to the light and gently stretch it while looking for a hole. You can get a replacement diahpragm from your local dealer. I'd much prefer to simply replace the petcock with a high quality manually operated petcock and plug the vacuum line. Of course, then you'll have to turn your gas on and off manually, old school style.

Good Luck

Jul 30, 2011 | 2000 Harley Davidson XL 1200 C Sportster...

1 Answer

Changed the ignition on 1996 sportster xl1200c now it dies out when i start of in first and in second like its not getting any gas

Well, pull the fuel line loose from the carb, put it in a catch can, and spin the engine. The '96 and later Harley's have a vacuum operated petcock if it is still stock. It gets vacuum from the intake maniold or backside of the carb through a small vacuum line. The hose plugs onto the backside of the petcock. If you're not getting any vacuum or the diaphgram in the petcock is damaged, you won't get any fuel to the carb.

Also, try loosening your fuel cap. Don't take it completely off just good and loose. If the fuel tank vent in the cap is plugged, a vacuum will build up in the fuel tank quickly and stop the flow of fuel.

Are you sure you have your ignition system timed and wired correctly?


Mar 27, 2011 | 2000 Harley Davidson XL 1200 S Sportster...

1 Answer

I just picked up a peacock from dudley perkins Harley. assembled the thing and screwed it into the gas tank. I hooked up the fuel line but there isnt any gas did I do something wrong?

If your petcock is a standard replacement part, you must connect the vacuum line to the backside of the petcock. There should have been a vacuum line on your old petcock unless a previous owner has changed the petcock to a manually operated one. The vacuum line comes off the backside of the carburetor and supplies vacuum to the VOES switch and the petcock.

Still even with the vacuum line connected, you won't get fuel until you turn the engine with the starter. The engine must turn to generate the vacuum to open the petcock. If you have a hand operated vacuum pump, you can use this to check the fuel flow from your petcock.

Good Luck

Feb 04, 2011 | 2000 Harley Davidson FXDL Dyna Low Rider

2 Answers

I can not get gas to the carbs how many vacuum hoses feed into the petcock??

petcock should only have [1] vac to inlet manifold & [1] fueling carbs & would be different diameters so you cant confuse them
Cheers Rob.

Jul 30, 2009 | 1985 Suzuki GS 700 ES

1 Answer

My gs500 wont start.

I am not familiar with tha GS500. If it has carbs and not fuel injection then try the following.

Get new stock plugs from the dealer. Shut off the gas and drain the carb. Now remove the water trap from the bottom of the petcock. Any water there? Dump the contents of the water trap and briefly turn the gas on . Hold a cup to the petcock to catch the flow. Turn off the gas and look at the bottom of the glass. Any water at the bottom? Any water in the tank should be gone now. Put the petcock bowl and fuel line back on. Turn on the gas and wait for the carb to fill with fuel. Give it a try now. Choke on?

Mar 20, 2009 | 1995 Suzuki GS 500 E

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