XJ6 & XJ12 Series I, II & III 1968-1992

Fuel transferring tank to tank

 
  #1  
Old 02-01-2019, 09:37 PM
Junior Member
Thread Starter
Join Date: Jan 2018
Location: Armidale
Posts: 9
Likes: 0
Received 4 Likes on 1 Post
Cool Fuel transferring tank to tank

1983 XJ6 VP. I have checked to changeover switch and the fuel returns to the correct tank but the r/h tanks is overflowing and the charcoal canister is being filled with fuel from the breathers. At that point the car stalls and takes some starting. Switching tanks helps? But today it left a trail of fuel all the way home. Charcoal canister pipes were disconnected but most came from the open filler cap.
Any clues?
col
 
  #2  
Old 02-02-2019, 01:31 AM
Veteran Member
Join Date: Mar 2008
Location: Pacific Northwest USA
Posts: 20,156
Received 6,560 Likes on 4,863 Posts
Default

Since you've confirmed fuel is being returned to the correct tank I don't see how this can be anything other than a problem the changeover valve in the boot. If the RH tank is overflowing I'd say the fuel is being drawn from the left tank but being returned to the right tank. In other words, the return valves are responding correctly to the dashboard switch ...but the changeover valve isn't.

Cheers
DD
 
The following users liked this post:
Junkyardjohn (02-03-2019)
  #3  
Old 02-02-2019, 09:06 AM
Member
Join Date: Aug 2018
Location: Phoenix
Posts: 65
Likes: 0
Received 35 Likes on 21 Posts
Default

Doug said ....."but the changeover valve isn't."

I think I have the same problem, but I've never filled both tanks full enough to experience the overflow that the OP describes.

If I fuel one of the tanks, within a few hours both tanks are at the same level. It is as though there's no changeover valve at all.

i suppose the valve has some sort of electrical coil in it, and if that's shot the valve needs to be replaced, but if it is just sticking is there a possibility of cleaning it out and restoring functionality?

Any procedure for cleaning them up?

Phil
 
  #4  
Old 02-02-2019, 10:10 AM
Veteran Member
Join Date: Mar 2008
Location: Pacific Northwest USA
Posts: 20,156
Received 6,560 Likes on 4,863 Posts
Default

Yes, they've sometimes been known to simply get stuck. I suspect any aerosol solvent can be used to un-stick them. Carb cleaner, WD40, PB Blaster....whatever your favorite is. Worth a try.

If you disconnect the changeover valve in the boot you must be ready for a gush of gasoline. I use two short pieces of 1/2" wood dowel, with one end ground to a point, for easy (and very fast!) insertion into the fuel hoses that supply the valve.

Cheers
DD
 
The following users liked this post:
Junkyardjohn (02-03-2019)
  #5  
Old 02-02-2019, 11:25 AM
Senior Member
Join Date: Aug 2017
Location: Cincinnati Ohio
Posts: 414
Likes: 0
Received 226 Likes on 114 Posts
Default

My new Series III has intermittent problems like this and I plan on addressing it when I get home in the spring. I was thinking there would probably be a flood of gasoline. Doug, you tip about the plug is just what I needed.
 
  #6  
Old 02-02-2019, 11:50 AM
Veteran Member
Join Date: Jul 2012
Location: Walnut Creek, California
Posts: 5,737
Received 1,947 Likes on 1,570 Posts
Exclamation

I suspect the change over valve. My mind is imprinted as to the switch on the fascia. Right in, left out . As to tank selection.

So, if so, the valving and the almost "infamous: switch in the boot should respond accordingly.

Select "left on the fascia. The switch in the boot directs the pump. also in the boot, to draw from the left tank. And,, the excess to be returned to the left tank,

Any abberration makes a mess..

.. Carl
 
  #7  
Old 02-03-2019, 01:27 PM
Andy Paine's Avatar
Junior Member
Join Date: Jun 2018
Location: Clifton VA
Posts: 24
Received 2 Likes on 2 Posts
Default

Yep. That is exactly what I had when I first bought my car last fall. When I finally changed out the changeover valve, after I had already changed the return valves, it fixed the problem. Turns out I probably didn't need to change the return valves.
 
  #8  
Old 02-04-2019, 08:38 PM
XJDanny's Avatar
Senior Member
Join Date: Jul 2014
Location: Snohomish, Washington , USA
Posts: 916
Received 207 Likes on 119 Posts
Default

I had the same issue a few months ago. My changeover valve had something foreign from the fuel stuck in it. We cleaned the valve and it now works fine. I plan to add fuel filters on either side of the changeover valve so this doesn’t happen again.
 
  #9  
Old 02-05-2019, 05:36 PM
Fraser Mitchell's Avatar
Veteran Member
Join Date: Dec 2009
Location: Crewe, England
Posts: 7,353
Received 1,574 Likes on 1,311 Posts
Default

I had this valve stick a few of times. It was usually always when I had the trunk full of holiday stuff, so it all had to come out, plus the spare wheel so I could get to the valve and tap it with a spanner or something. That usually moved it then it was repack trunk and off we went again !
 
The following 2 users liked this post by Fraser Mitchell:
Junkyardjohn (02-08-2019), XJDanny (02-06-2019)
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Alex.S
S-Type / S type R Supercharged V8 ( X200 )
1
07-18-2017 12:55 AM
86jag
XJS ( X27 )
7
07-22-2016 09:04 PM
Reverend Sam
XK8 / XKR ( X100 )
11
11-14-2011 11:44 AM
Bamaman
XK8 / XKR ( X100 )
1
07-28-2011 12:46 AM
cbomb
S-Type / S type R Supercharged V8 ( X200 )
1
09-14-2008 12:39 AM

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 

Thread Tools
Search this Thread
Quick Reply: Fuel transferring tank to tank


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: