Honda HT3813 project..leaks - MyTractorForum.com - The Friendliest Tractor Forum and Best Place for Tractor Information
 
LinkBack Thread Tools Display Modes
post #1 of 7 Old 08-05-2019, 03:40 PM Thread Starter
MTF Junior Poster
 
Join Date: Aug 2019
Posts: 5
Honda HT3813 project..leaks

I recently picked up an HT3813 project that I knew was in need of a timing belt due to what the previous owner had told me. It would backfire through the carb after about 5 minutes...but he could continue to run on full choke.
After changing the belt and water pump and cleaning everything up...I went to start up. It fired right up, and ran very smoothly. However, it shortly shut down for some unknown reason. It was then I noticed it was leaking a healthy stream from the fuel catch on the frame. It appeared that the fuel pump was going to feed fuel as long as the key was on. It seemed odd...but I figured I'd need a new needle to take care of the excess fuel problem. I put in the new one, and once again, the engine fired right up very smoothly...and soon shut down again after 10 seconds. Once again, the fuel was leaking from the catch pan. There appears to be a larger connection on the fuel catch with nothing on it...does there need to be a hose connected there? The catch leaks out of the bottom it seems anyway...so I'm not sure what's happening there.
My main question is this...is there some sort of shut off of the fuel feed in some other manner than the needle? Is there a relay that senses fuel pressure? Should there be some sort of fuel return to tank rather then on the ground? I could be missing a part, however I have a service manual that is not showing me something I don't already see. I had drained the tank, and changed the fuel filter while waiting for the needle to come...so the fuel system is very clean now. I'd really like to use this thing because it's so darn cool!
dewders24 is offline  
Sponsored Links
Advertisement
 
post #2 of 7 Old 08-06-2019, 11:39 AM
Senior MTF Member
 
Craftsman_4791's Avatar
 
Join Date: Sep 2016
Location: Michigan
Posts: 133
Barn
Re: Honda HT3813 project..leaks

I had this same problem with my 4514 (same exact engine) and the problem I had was I had the fuel lines on the carb switched around the wrong way.

Soon to come JD 216 16hp Kohler K341 with attachments
1992 Honda 4514 14 hp GX360K1 twin liquid cooled engine hydrostatic (IN PICTURE)
1990 Honda 4518 18 hp GX640 2 cylinder liquid-cooled engine hydrostatic
1995 Craftsman GT6000 17hp Kohler Magnum Twin 6 speed
1978 Massey Ferguson 1655 18 hp Onan twin swap pedal drive hydro
(And a couple more that come and go)
Craftsman_4791 is offline  
post #3 of 7 Old 08-06-2019, 04:48 PM Thread Starter
MTF Junior Poster
 
Join Date: Aug 2019
Posts: 5
Re: Honda HT3813 project..leaks

I wish it was that simple..I'd gladly wear that dummy hat! The lines are correctly installed. I have two different carburetors that came with the deal...and both acted the same...hard to imagine two bad needle/seat assemblies...but you never know.
dewders24 is offline  
Sponsored Links
Advertisement
 
post #4 of 7 Old 08-06-2019, 04:52 PM
Senior MTF Member
 
Craftsman_4791's Avatar
 
Join Date: Sep 2016
Location: Michigan
Posts: 133
Barn
Re: Honda HT3813 project..leaks

Also your float in the carb(s) could be stuck, I've had that happen several times.

Soon to come JD 216 16hp Kohler K341 with attachments
1992 Honda 4514 14 hp GX360K1 twin liquid cooled engine hydrostatic (IN PICTURE)
1990 Honda 4518 18 hp GX640 2 cylinder liquid-cooled engine hydrostatic
1995 Craftsman GT6000 17hp Kohler Magnum Twin 6 speed
1978 Massey Ferguson 1655 18 hp Onan twin swap pedal drive hydro
(And a couple more that come and go)
Craftsman_4791 is offline  
post #5 of 7 Old 08-07-2019, 10:14 PM
master mechanic
 
Tom Bauer's Avatar
 
Join Date: Oct 2013
Location: maryland
Posts: 489
Re: Honda HT3813 project..leaks

fuel pump runs as long as the key is on, unless a interlock turns it off. you have a carb problem.
Tom Bauer is offline  
post #6 of 7 Old 08-08-2019, 06:23 AM Thread Starter
MTF Junior Poster
 
Join Date: Aug 2019
Posts: 5
I agree. I have exceeded my common sense limit and ordered a new carburetor. I wouldn't have guessed the two carbs I had would BOTH have the same defect, but it has to be true.
I figure the plastic seat assembly is leaking around its fit in the aluminum housing. Ethanol is the likely cause I suppose. I'll post an update when I have changed it out. Thanks for your response.
dewders24 is offline  
post #7 of 7 Old 08-16-2019, 07:43 PM Thread Starter
MTF Junior Poster
 
Join Date: Aug 2019
Posts: 5
Re: Honda HT3813 project..leaks

So I just wanted to report in on the success of replacing the carburetor with a brand new Honda replacement. It instantly ran like a top! The theory of the plastic seat assembly shrinking is accurate.
I took one of the two carbs I had that both failed in the same way... and tore apart the seat assembly. It is peened into the aluminum casting, so completely non-removable and non-repairable. The seat housing has an o-ring in place to keep the fuel from coming up beyond the seat, but being over 30 years old and exposed to ethanol fuel, it has also dried and shrunken up and no longer providing a seal. I purchased a new replacement from Bikebandit.com for $106 shipped.
dewders24 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the MyTractorForum.com - The Friendliest Tractor Forum and Best Place for Tractor Information 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











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



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