Question about 2003 Harley Davidson FXD Dyna Super Glide

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Changed out the original petcock with a non vacuum one still sounds like it is not getting fuel do I need to get one with vacuum?

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  • Sean Barry
    Sean Barry Mar 29, 2015

    yes fuel cut off

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Hi Sean, why did you change the petcock? And did you plug the vacuum line that was going to it for the non vacuum one?

Posted on Mar 29, 2015

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  • Master
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What do you mean by petcock? You mean fuel shutoff?

Posted on Mar 29, 2015

  • Doug Adams
    Doug Adams Mar 29, 2015

    Did you check and see if fuel will flow out of petcock before attaching the fuel line. If it is not flowing there you need to see what is going on in the tank. Possibly varnished over in the tank?

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1 Answer

Won t start


Try switching to RESERVE, as it should be mechanically operated, rather than vacuum operated.

If that works, test the vacuum operation on the petcock.
You can try sucking your brains out on the vacuum line going to the petcock, or apply a vacuum with something like this:

http://www.harborfreight.com/brake-bleeder-and-vacuum-pump-kit-69328.html#.UywkhPldVAA

When you do this, have a line going from the petcock to a catch can (gas can), and see if fuel flows under vacuum.

If that works, with bike running (petcock on RESERVE), pull vacuum line at petcock, put a finger over hose opening, and feel that it is drawing a vacuum.

Mar 20, 2014 | 2004 Harley Davidson XL 883 Sportster

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

Harley turns over but does not fire i checked fuses they are good i drained the fuel tank to make sure there was not any thing in the filter but i dont know if it is getting gas gas does not come out of...


You didn't say what year or model your bike was so I'll just take a guess here. In 1996 and later, Harley started putting vacuum operated petcocks on their bikes that are equipped with a carburetor. It should have a small vacuum line running to the backside of it unless someone has changed the petcock to a manual operated one. The vacuum line comes off the backside of the carburetor and supplies vacuum to the VOES switch and the petcock.

If it is a vacuum operated petcock, it will have a square plate on the backside with four small screws holding it on. Take the screws out and carefully remove the plate. Notice how the stuff in there comes out. There is a spring, a needle, and a diaphragm in the petcock. Hold the diaphragm up to the light and gently stretch it while looking for a hole. If you find one, put a new diaphragm in the petcock. Upon reassembly, connect the vacuum hose and turn the petcock to the normal run position. Leave the fuel hose off and spin the engine. Fuel should flow from the petcock. If you have a hand operated vacuum pump, you can connect it to the petcock and apply vacuum to get the fuel to flow.

Personally, I suggest changing the petcock to a high quality manually operated petcock and turn your fuel on and off manually. Old School style. Pingel makes a very high quality petcock. They aren't cheap but you'll never have another petcock problem.

Good Luck
Steve

May 16, 2011 | Harley Davidson FLSTF Fat boy Motorcycles

1 Answer

I have an 883 1998 sporty it runs but dies after 15 minutes but 2 to 3 minutes will pass and it turns on,wats the problem?cause i can tap on the ignition modgule and the bike will stay running?


Loosen, but don't take off, the fuel cap. I've seen the vent valve in the cap mess up and do this. If that doesn't help, you may have a problem with the fuel petcock. In 1996, Harley went to a vacuum operated fuel shutoff valve and they give lots of problems. I always recommend to change the vacuum operated petcock out with a high quality manually operated petcock, old school design that you manually turn the fuel off and on. A Pingle petcock won't give you any problems. But you can repair the original petcock by replacing the diaphragm in the backside of it.

Good Luck
Steve

May 02, 2011 | 1993 Harley Davidson XLH Sportster 883

1 Answer

2003 harley davidson sportster 1200 custom. runs fine shortly then dies with spurts of fire. the light stays on and if i pull the clutch when its still running, it goes back to normal idle and responds to...


It sounds like a fuel starvation problem since it's spitting back out of the carb. Check you fuel cap to see if the vent is working. Loosen the cap and ride and see if that makes any difference.

Also, if your bike is equipped with the original vacuum equipped petcock, there could be problem with this as well. I've seen them get holes in the diaphragm and I've seen cause a vacuum leak. Check the vacuum hose and diaphragm. You'll have to remove the petcock from the tank. Personally, I'd recommend that you change the petcock to a high quality manually operated petcock like a Pingel.

Good Luck
Steve

Oct 09, 2010 | 2003 Harley Davidson XL 1200 C Sportster...

1 Answer

Bike runs for a mile then stops


You didn't tell me what year Sportster we're dealing with. So, I'll cover a few general things to check.

If your bike is running for about a mile and then stopping and it does this repeatedly, It sounds like a fuel problem. Most likely it's either the petcock or the fuel tank vent system.

First, If your bike is made after 1996, it probably has the OEM vacuum operated petcock. These petcocks are designed to open when the engine is running and close when it stops. There is a small vacuum line that plugs into the backside of the petcock. When the engine is running, this line supplies the vacuum. Check the line and make sure that it hasn't come loose or cracked. It originates behind the carb and goes upwards underneath the tank to the VOES switch and it has a "Y" in the line that reduces the size and then runs to the backside of your petcock.

If it is intact, you'll need a hand vacuum pump to test the petcock for proper operation. Connect the vacuum pump to the rear of the petcock. Remove the fuel line from the petcock. Now, apply vacuum to the petcock with the pump. Fuel should flow from the petcock. If not, the petcock is either bad or the strainer in the tank is stopped up.

Remove the petcock from the tank. Place a large funnel under the petcock and direct the funnel into an empty gasoline can large enough to hold all the fuel in the tank. Loosen the petcock enough so that the fuel runs out at a rate that you can control. When empty, finish removing the petcock from the tank. Inspect and clean the screen. Now, on the back side of the petcock is a square plate held on by four screws. Remove the screws and remove the plate. Underneath the plate you'll find a diaphragm. Hold the diaphragm up to the a light and gently stretch it and look for holes. If you find a hole, you'll have to replace the diaphragm.

Look inside the petcock where the needle is for trash. At this point you should be able to blow back up through the petcock to check for obstructions. Reassemble petcock and reinstall in the tank.

I've seen these petcocks give a lot of trouble exactly like you're experiencing. I recommend that you replace the petcock with a manually operated petcock. The Pingle petcocks are very high quality units but a bit pricey. If you'd rather stick to an OEM type unit, purchase a petcock from the Harley shop for a 1995 or earlier model. This will be a manually operated petcock. Plug the vacuum hose that you'll no longer need. You'll have to get into the habit of turning the gas on and off whenever you get on or off the bike like the old timers did. But, they'll never let you down.

Now, remove the fuel cap. Wipe it down real well with a clean cloth. Now, make sure your friends are NOT around for this test or you'll never hear the end of it. Put the threaded end of the fuel cap up to your lips and try to **** and blow through the vent. If you cannot, the vent is bad and you're not getting gasoline to your carb due to a buildup of vacuum in the tank.

Good Luck
Steve

Jul 15, 2010 | 2000 Harley Davidson XL 1200 C Sportster...

1 Answer

Engine turns over but won't start lots of back firing


It sounds like it's not getting fuel for one reason or the other. If the tread is correct, you '01 Sporty is equipped with the vacuum operated petcock. If the diaphragm is bad in the petcock, no fuel gets to the carb. If the vacuum line is off the rear of the petcock, the VOES switch, or the carb, it will get no fuel. These petcocks are known to be a problem area. I always advise the purchase of a Pingle petcock and replace the original. If the Pingle is too pricey, go for a stoke pre-1996 original equipment petcock.

Now, if the bike has been sitting up for a long period of time (longer than a year), you may have to remove, disassemble the carb, and clean the jets and air passages out. Regrettfully, this is not a job for most amateurs unless they are mechanically inclined.

Apr 22, 2010 | 2001 Harley Davidson XL Sportster 883...

1 Answer

I have a 2005 harley model flstf it is sputtering out acts like it wants to shut down. is there a fuel fitler


If your bike is a carburetor equipped, there are several things that might cause this. To answer your question, there is no fuel filter as such from the factory. Someone may have added on in the past if the bike was previously owned. There is a strainer in the tank. To get the strainer out, you must remove the petcock. Drain the tank first.

Other problems that could cause this are the vacuum operated petcock and the carburetor itself. The vacuum operated petcock is common source of problems with fuel flow. I suggest that the original vacuum petcock be replaced with a high qualtiy manually operated petcock and the vacuum supply tube eliminated. I've seen these petcocks not only starve the engine for fuel but also cause an air leak that causes the engine to run badly. It can be repaired by cleaning it out and replacing the vacuum diaphragm in the rear of the petcock.

As for the carburetor, it may simply be time for a good cleaning and overhaul. The accelerator diaphragm is one area that needs attention. These diaphragms will get holes in them and quit working causing a lean mixture stumble and spitting out of the carb when accelerating.

Apr 09, 2010 | 2000 Harley Davidson FLSTC Heritage...

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