83 vt750c temporary fuel pump bypass - Honda Shadow Forums : Shadow Motorcycle Forum
Reply
 
LinkBack Thread Tools
post #1 of 18 (permalink) Old 07-22-2008, 05:47 PM Thread Starter
Member
 
Join Date: Jun 2008
Location: Indiana
Posts: 339
83 vt750c temporary fuel pump bypass

I'm going to start my new project for the first time this weekend. My starter is getting rebuilt and will be ready Friday. My fuel pump is bad but I'm pinching pennies until I hear it run. I've cleaned the gas tanks & carbs and will be changing fuel filter and all the lines. Anyway, I should be able to route a temporary line from the main tank to my carb inlet to get it running right? I'm assuming so, just checking for any possible issues or reasons why it wouldn't work. Thanks again.

83_Shadow_750 is offline  
Sponsored Links
Advertisement
 
post #2 of 18 (permalink) Old 07-23-2008, 01:44 AM
Senior Member
 
Join Date: May 2007
Location: LEAVENWORTH WASHINGTON
Posts: 5,286
The only reason for the fuel pump is that if you tip over the tip over switch will shut off the pump, it a safety issue, it will work just fine.


Ted
SHADOW 1100T is offline  
post #3 of 18 (permalink) Old 07-23-2008, 01:46 AM
Member
 
Join Date: Jun 2008
Location: MA/RI
Posts: 116
is that tip over switch in the relay or in the pump?


1988 Honda Shadow VLX
lane is offline  
 
post #4 of 18 (permalink) Old 07-23-2008, 01:53 AM
Senior Member
 
Join Date: May 2007
Location: LEAVENWORTH WASHINGTON
Posts: 5,286
Neither, it's somewhere else and I don't know where on your bike it might be but if you have a manual it will tell you, if you by pass why worry about it, it will only shut off the pump.

Ted
SHADOW 1100T is offline  
post #5 of 18 (permalink) Old 07-23-2008, 08:16 AM
Senior Member
 
tubes_rock's Avatar
 
Join Date: Jun 2006
Location: Northern NH
Posts: 5,234
I've never run across a tip-over switch, but I could be wrong about it not existing. The fuel pump stops when the engine stops. Usually the engine stops when the bike tips over.

--Justin

Currently Running Stable:
2010 Honda NT700V
1986 Shadow 700
1986 Honda Trail 110 (Postie Bike)
1987 Honda Rebel 450
1973 Honda Mini Trail 50
tubes_rock is offline  
post #6 of 18 (permalink) Old 07-23-2008, 12:38 PM
Senior Member
 
Join Date: Apr 2007
Location: Kansas
Posts: 1,308
The fuel pump is needed on your 83 Shadow because most of the fuel in the tank is lower than the carbs. It should gravity feed as long as the tank is full or almost full. You would not want to ride the bike with the pump bypassed but it should work long enough to get the bike running.

Something else you could try is to get a large syringe from a horse doctor and fill the carbs with gas via the fuel line. It should start and run about a minute with the gas that is in the float bowels. I used to do that on the KLR so I could start it with the valve cover off. I was checking to see if there was sufficient oil flow to the cams.
callmeal is offline  
post #7 of 18 (permalink) Old 07-23-2008, 12:59 PM
Member
 
Join Date: Oct 2007
Location: Atlanta, GA
Posts: 119
fuel pump

I don't think that there's a tip-over switch. Pump's there because of the tank heights vs. the carbs. Syringe idea may be better because the huge line on the main tank will have to be stepped down to a decent size to fill the carbs. Took me a while to figure out why that output line was so large...

Shadow- the sensible way to handle a midlife crisis
fadingshadow is offline  
post #8 of 18 (permalink) Old 07-23-2008, 01:23 PM
Member
 
bondo's Avatar
 
Join Date: Dec 2004
Location: Bradenton, FL
Posts: 219
fuel cut-off relay

There is a tip over switch, called the fuel cut-off relay, under the right side cover. I bypassed it on my son's '84 VT700 3 years ago and it's still working just fine.

2005 750 Aero
1997 Spirit 1100

Just remember that wherever you go..... there you are!
bondo is offline  
post #9 of 18 (permalink) Old 07-23-2008, 02:35 PM
Senior Member
 
Join Date: Apr 2007
Location: Kansas
Posts: 1,308
On the older Shadows, the fuel cut-off relay gets a signal from the ignition system. If the engine is running after tipping over, the fuel pump will still run. If the engine stops, the fuel pump will stop even when the key is still on. With the relay bypassed, the pump will run until the key is turned off.

Many newer bikes have a tip over switch in one form or another. Harley has a “Bank Angle Sensor” that shuts off the ignition if the bike leans more than 45 degrees to either side. On fuel injected models, it shuts off the fuel pump also. It’s tied into the Turn Signal Security Module.
I watched a guy tip over a large touring bike, Kawasaki maybe. It would not restart until someone told him to turn off the key for five seconds. That’s the same way the Harleys must be reset.
callmeal is offline  
post #10 of 18 (permalink) Old 07-23-2008, 05:37 PM Thread Starter
Member
 
Join Date: Jun 2008
Location: Indiana
Posts: 339
Hey thanks for the replies. Yah, that dang fuel line coming off of the main tank is big. I was going to use my aux tank to do the temporary bypass. It's currently off the bike.And no, I won't be riding it that way. I just haven't heard this bike run yet and I want to spend as little as possible until I hear her purr. .............BUT that syringe idea sounds great. I may go that way. Hope she purrs so another Shadow can come back to life.

83_Shadow_750 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Honda Shadow Forums : Shadow Motorcycle Forum 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.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Way to test fuel pump and fuel pump relay? TorchRed77Vette Technical Discussion 11 06-23-2013 04:37 PM
Fuel pump bypass? Ricky9688 Technical Discussion 7 02-03-2011 11:38 AM
'83 VT750C water pump and fuel lines louie Technical Discussion 7 09-19-2010 07:55 PM
83 vt750c fuel pump contactor diagram lostinthespin Technical Discussion 8 11-04-2009 02:33 PM
Rigging a temporary ignition switch on 83 VT750 electricd7 Technical Discussion 7 04-10-2009 02:52 PM

Posting Rules  
You may not post new threads
You may not 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 On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome