OT's Redneck Repair Guide vol. 1: Repair you leaky vaccum petcock for under $10.00 : V-Twin Forum: Harley Davidson Forums
» Sponsors

Go Back   V-Twin Forum : Harley-Davidson Motorcycle Forums > General Motorcycle Related NON-TECHNICAL Discussion > General Harley Talk
New User? Register Forgot Password

Reply
 
LinkBack Thread Tools Display Modes
Old 06-12-2003, 05:50 PM   #1 (permalink)
IronButt
 
Join Date: Apr 2003
Location: Arizona
Posts: 259
OscarTango wants to know Dino or Syn?
Lightbulb OT's Redneck Repair Guide vol. 1: Repair your leaky vaccum petcock for under $10.00

If you've lived in a dry climate (say, Arizona) or you've had your Harley for a while, chances are your petcock has leaked fuel at one time or another. Now if you're like me and own a late model Harley, you've probably got a vaccum actuated petcock on your bike. These can be fairly expensive to replace. Even a gravity petcock can run you $30.00 or more by the time you figure in new fuel line. However, just because your vaccum petcock has a rotten diapharm and leaks doesn't mean that you have to spend a bunch of money. Now unfortunately HD doesn't sell a rebuild kit for these because they'd rather charge $92.00 for a new one. So what can you do? Fabricate your own rebuild kit.

Vaccum Petcocks 101: (Feel free to skip this if you want to)
As you disassemble your vaccum petcock you'll notice there are two independant cavities seperated by a rubber diaphram. One of these cavites contains a spring attached to the diaphram and the chamber is connected to the bike's vaccum hose. The other cavity is where the fuel flows through the petcock. There is a plunger attached to the diaphram on this side. This way when the engine is not running, the spring on the opposite side of the diaphram presses the plunger into the fuel cavity and shuts off the gas. That said, it is typically this diaphram that gets dry rotted in hot arid climates and begins leaking fuel. Though a vaccum actuated petcock is a nice idea. It's extra bullshit. You don't need it. For years bikes only came with gravity fed petcocks.

What does this mean? We're going to convert your fancy schmancy vaccum petcock into a proven old school gravity feed. Here's how.

Tools you will need: Phillips screwdriver, pair of pliers, 3/4" hose clamps (2), any type of rubber material that will make a good seal and can withstand gas and some heat, and a pocket knife.

Step One: Remove the fuel and vaccum lines from the petcock and drain the gas tank. Once this is done, remove the petcock from the tank.

Step Two: On the back side of the petcock there are four screws. Remove them and the two back plates, then remove the actuator spring in the vaccum chamber

Step Three: Lay the petcock, backside down, on your chosen piece of gasket material and trace the outline of the petcock with your pocket knife. You now have a new form fit gasket for your petcock.

Step Four: Prep the gasket for reassembally by punching four pilot holes to allow for the screws you removed earlier.

Step Five: Place gasket in front of the diaphram plunger (or directly over the fuel cavity), replace the two back plates, diaphram and all, but leave out the actuator spring. Replace the screws and tighten the living hell out of it!

Step Six: Re-attach petcock and reconnect hoses (since you destroyed the factory hose clamps, now would be a good time to use a new one).

Final Step: Re-fuel bike and run it for a while. Kill the engine and check for leaks. If there are none, congratulations, you're done. Just don't forget that now you'll have to shut the fuel off manually using the petcock valve.

"I've watched way too many episodes of junkyard wars!"

Enjoy!

OscarTango
__________________
Americans play to win at all times. I wouldn't give a hoot and hell for a man who lost and laughed. That's why Americans have never lost nor ever lose a war. -- Gen George S. Patton

Last edited by OscarTango; 06-13-2003 at 09:36 AM.
OscarTango is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 06-12-2003, 05:58 PM   #2 (permalink)
IronButt
 
Join Date: Nov 2001
Location: Gone with the wind.
Posts: 9,186
JimmyK wants to know Dino or Syn?
And then he went home.






Amen
JimmyK is offline   Reply With Quote Quick reply to this message
Old 06-12-2003, 06:03 PM   #3 (permalink)
IronButt
 
Join Date: Apr 2003
Location: Arizona
Posts: 259
OscarTango wants to know Dino or Syn?
BWAHhaha! Where did you find that picture? I've got a few friends I'm going to send that too!
__________________
Americans play to win at all times. I wouldn't give a hoot and hell for a man who lost and laughed. That's why Americans have never lost nor ever lose a war. -- Gen George S. Patton
OscarTango is offline   Reply With Quote Quick reply to this message
 
Old 06-12-2003, 06:28 PM   #4 (permalink)
IronButt
 
Join Date: Jul 2002
Location: Surf City Huntington Beach
Posts: 565
jefro wants to know Dino or Syn?
OT, great tip. I'll probably need this info in the future sometime, but then I'll have forgotten most of it.
Idea: I'll print it out then put it in my office file "Harley papers".
jefro is offline   Reply With Quote Quick reply to this message
Old 06-12-2003, 10:01 PM   #5 (permalink)
IronButt
 
Join Date: Jul 2002
Location: So. Cal
Posts: 3,619
medicinewoman wants to know Dino or Syn?
Re: OT's Redneck Repair Guide vol. 1: Repair your leaky vaccum petcock for under $10.00

Quote:
Originally posted by OscarTango
[BHowever, just because your vaccum petcock has a rotten diapharm and leaks doesn't mean that you have to spend a bunch of money.

OscarTango [/B]
OT

I read in my Biker Barbie Manual and it say's DO NOT use a diapharm that it is unreliable. To use only "birth control pills". Hope this help's the women members of the forum.

Cheri aka Medicine Woman
medicinewoman is offline   Reply With Quote Quick reply to this message
Old 06-12-2003, 11:51 PM   #6 (permalink)
IronButt
 
Join Date: Oct 2002
Location: SF Bay Area Ca.
Posts: 106
Stroker Dave wants to know Dino or Syn?
Jimmy K; man the thing you find on the puter are amazing,do you have a job or do you spend all your time surfing the web and riding your scoot? LOL
OscarTango Here is where I first saw that picOld Camper
Stroker Dave is offline   Reply With Quote Quick reply to this message
Old 06-13-2003, 09:42 AM   #7 (permalink)
IronButt
 
Join Date: Apr 2003
Location: Arizona
Posts: 259
OscarTango wants to know Dino or Syn?
Quote:
I read in my Biker Barbie Manual and it say's DO NOT use a diapharm that it is unreliable.
Yeah, rotten diaphrams when dealing with your PET COCK can lead to unwanted -ahem- leakage. This can be very dangerous and often result in unwanted "complications"

On a serious note though, I had to so this to my bike and so far I've had no problems. Nothing like a "cheap fix"!
__________________
Americans play to win at all times. I wouldn't give a hoot and hell for a man who lost and laughed. That's why Americans have never lost nor ever lose a war. -- Gen George S. Patton
OscarTango is offline   Reply With Quote Quick reply to this message
Old 08-24-2003, 11:31 PM   #8 (permalink)
Banned
 
Join Date: May 2003
Location: Orange, CA
Posts: 112
Penrod wants to know Dino or Syn?
OscarTango thank you! Had the problem you mentioned, so I used your fix and it worked fine. What pissed me off was I went to three dealers here in sunny (hot and dry) California for a new diaphram, as initially I wanted to keep it stock. All three of them 1) did not have the part and 2) their 'puter shows they've never had one in stock. They tried to sell me a $100 aftermarket fuel valve (Pingle) that replaces the factory one that often fails (but for which they've never had a replacement part). One even had a whole new factory assembly for a low low price of $88. With your fix, I ended up using some black shrink tubing made from polyolefin, final cost to me was $0. .

Last edited by Penrod; 08-24-2003 at 11:34 PM.
Penrod is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the V-Twin Forum : Harley-Davidson Motorcycle Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself. WE WILL SEND A CONFIRMATION EMAIL TO THE ADDRESS YOU PROVIDE. If the email address is NOT VALID, you will not be given access to the system!
Email Address:
Motorcycle Year/Make
Location
Where you live
Security Question
*Required, this field is not shown to others: While balancing on a piece of wood, two inches by four inches known as a 2x4, john and his friend sally both spotted a dalmatian inside a truck with sirens, headed to put out a fire. State what kind of animal is mentioned in the sentence above.

Log-in


Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Carberator squirting gas everwhere/leaky Petcock TheCiscoKid Harley-Davidson FXR 7 03-01-2012 09:31 PM
Am I lucky, or what? Vol 2 luvstoride Off Topic Discussion 5 10-12-2008 12:23 PM
Leaky Petcock whatsit Japanese/European Cruisers 3 05-13-2006 05:57 PM
Primary seeping up stator leads to vol reg plug? fxdx99 Twin-Cam Engine 7 09-08-2003 09:50 PM
How does the vaccum Petcock work? Curtis629 Twin-Cam Engine 8 06-06-2003 06:51 AM

Powered by vBadvanced CMPS v3.2.2

All times are GMT -5. The time now is 07:44 AM.


Powered by vBulletin® Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO 3.6.0
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
(C)2001-2012 V-twinForum.com All Rights Reserved (C)2001- V-twinForum.com All Rights Reserved
Motorcycle News, Videos and Reviews
Honda Grom Forum strong>Kawasaki Z125 Forum Harley Davidson Forum Honda 600RR Forum Kawasaki Forum Yamaha R6 Forum Yamaha FZ-09 Forum
1199 Panigale Forum Honda Africa Twin Forum Roadglide Forum Honda CBR1000 Forum Vulcan Forum Yamaha R1 Forum Yamaha R3 Forum
Ducati Monster Forum Harley Forums Honda CBR250R Forum ZX10R Forum Star Raider Forum Yamaha Viking Forum
Suzuki GSXR Forum V-Rod Forums Honda Shadow Forum Kawasaki Motorcycle Forum Star Warrior Forum KTM Duke 390 Forum
SV650 Forum BMW S1000RR Forum Honda Fury Forum Kawasaki Versys Forum Drag Racing Forum Ducati 899 Panigale Forum Ducati 959 Panigale Forum
Suzuki V-Strom BMW K1600 Triumph Forum Victory Forums Sportbikes BMW NineT Forum
Volusia Forum BMW F800 Forum Triumph 675 Forum MV Agusta Forum HD Street Forum Suzuki GW250 Forum
Yamaha Motorcycles Victory Gunner Forum Victory Charger Forum Honda Vultus Forum HD LiveWire Forum Ninja H2 Forum
BMW Scrambler Forum Ducati Scrambler Forum Kawasaki Ninja 250SL Forum