Classic cars forum & vehicle restoration.
|
Author |
Message |
ukdave2002
Joined: 23 Nov 2007 Posts: 4104 Location: South Cheshire
|
Posted: Sat Jan 18, 2014 7:37 pm Post subject: Misfire SU Fuel Pump problem |
|
|
Thought I share this as its an odd yet simple and cheap fault to fix!
In the last couple of weeks, my Z van developed a misfire, it would at worst kill the engine, a very unpredictable fault; the van could run for hours and then die or run for just a few mins and then stop.
The symptoms were that the van would be running fine and then suddenly die, it would sometimes restart and run fine, or refuse to start at all….. It had to be electrical; the wiring on the van is shocking; it’s completely wired in black pvc !, to be honest I suspected the Lucas PLC switch; I have seen a few of these recently breaking down. So I wired the coil and fuel pump directly to the battery….same problem swapped the coil…same problem. When the engine failed I whipped the cover of the float chamber and fuel was allways at the correct level.
So I attached a voltmeter to the common coil (SW) and fuel pump connection, as the engine died I noticed the voltage dropped, given that this is now wired directly to the battery and the coil had been changed I took closer look at the fuel pump, after removing the points the fault became clear; the insulation on the cables that go to the fuel pump coil had broken down, randomly earthing the live pump feed and of course coil.
To fix this fault, the pump coil needs to be removed from the casing, this requires the coil to be pressed or tapped out from the top; the 60 year old insulation can then be replaced
Van now runs fine
Dave
Last edited by ukdave2002 on Sun Jan 19, 2014 12:46 pm; edited 1 time in total |
|
Back to top |
|
|
buzzy bee
Joined: 23 Nov 2007 Posts: 3382 Location: South Cheshire
|
Posted: Sat Jan 18, 2014 8:01 pm Post subject: |
|
|
Nice when you find a fault like that! |
|
Back to top |
|
|
kevin2306
Joined: 01 Jul 2013 Posts: 1359 Location: nr Llangollen, north wales
|
Posted: Sat Jan 18, 2014 9:15 pm Post subject: |
|
|
great fix, faults like that can be quite untraceable!
Kev |
|
Back to top |
|
|
Rick Site Admin
Joined: 27 Apr 2005 Posts: 22446 Location: UK
|
|
Back to top |
|
|
ukdave2002
Joined: 23 Nov 2007 Posts: 4104 Location: South Cheshire
|
Posted: Sun Jan 19, 2014 12:55 pm Post subject: |
|
|
Rick wrote: | Good stuff do you drive the van around much?
RJ |
It gets used as a van I have permits from the council for it so we can take rubbish to the tip, and we were doing some building work recently, so it was used to pick up supplies.
Dave |
|
Back to top |
|
|
|
|
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum
|
php BB powered © php BB Grp.
|