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by Rex_tulips - 30/07/25 07:59 PM
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Forums34
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Aug 24th, 2023
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Joined: May 2017
Posts: 26
Just Getting Started
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OP
Just Getting Started
Joined: May 2017
Posts: 26 |
1990 +8 3.9 - car would not start, suspect fuel pump as no initial pump priming noise when you turn on the ignition? Checked the voltage at the pump, zero, so assumed it could be a fuse? Checked fuse "INJ' plus others just n case, all ok? Checked the 'cut off' if inverted thing, seems fine? Any other ideas for the knowledgable folks on here appreciated. Thanks
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Joined: Dec 2009
Posts: 35,791 Likes: 471
Tricky Dicky Member of the Inner Circle
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Tricky Dicky Member of the Inner Circle
Joined: Dec 2009
Posts: 35,791 Likes: 471 |
Fuel pump relay is a common failure, normally on the horizontal section of the firewall under the bonnet drivers side.
2009 4/4 Henrietta
1999 Indigo Blue +8
2009 4/4 Sport Green prev
1993 Connaught Green +8 prev
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Joined: Jul 2007
Posts: 26,760 Likes: 425
Member of the Inner Circle
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Member of the Inner Circle
Joined: Jul 2007
Posts: 26,760 Likes: 425 |
Yes very common the relay failure
JohnV6
2022 CX Plus Four
2025 MG ZS EV aka Trigger
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Joined: May 2017
Posts: 26
Just Getting Started
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OP
Just Getting Started
Joined: May 2017
Posts: 26 |
Thx guys - will get replacement and swop.
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Joined: Feb 2016
Posts: 7,943 Likes: 218
Talk Morgan Guru
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Talk Morgan Guru
Joined: Feb 2016
Posts: 7,943 Likes: 218 |
The fuel pump fuse is electrically after the relay with white/purple wire into it and white/blue out to pump itself via cutout switch. When required to work you should be able to measure +12 volts either side of fuse WRT chassis. Lack of voltage here would confirm likelihood of relay being faulty.
Richard
2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone
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Joined: Jul 2010
Posts: 53
Just Getting Started
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Just Getting Started
Joined: Jul 2010
Posts: 53 |
Bosch part 0986 AH0 602 - 424 Land Rover Discovery.
Nigel
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Joined: Sep 2014
Posts: 170 Likes: 2
L - Learner Plates On
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L - Learner Plates On
Joined: Sep 2014
Posts: 170 Likes: 2 |
...and you may want to buy a couple of relays, as getting a duff one straight out of the box is not uncommon.
Dave
vbalddave
Red 1993 +8 3.9
North Yorkshire
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Joined: Feb 2016
Posts: 7,943 Likes: 218
Talk Morgan Guru
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Talk Morgan Guru
Joined: Feb 2016
Posts: 7,943 Likes: 218 |
Bosch part 0986 AH0 602 - 424 Land Rover Discovery.
Nigel Thats a generic 12 volt 30 amp 5 pin diode relay available from any good auto electric outlet. I would be tempted to buy a couple of 40 amp diode protected ones then they can be swapped out for any other on a Morgan, not to mention being less stressed in fuel pump application.
Richard
2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone
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Joined: Sep 2014
Posts: 2,272 Likes: 7
Talk Morgan Expert
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Talk Morgan Expert
Joined: Sep 2014
Posts: 2,272 Likes: 7 |
While you are under the dashboard replacing the relay take a couple of minutes to label each relay with its function. This will really help you in future when experience other similar issues (don't ask how I know!)
I cannot remember the sequence and I am away from my notes at present, but no doubt others here do.
Andy G
1999 +8 , Indigo Blue.
Ex-John McKecknie/Mike Duncan 1955 +4 racer.
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Joined: Sep 2010
Posts: 2,396 Likes: 14
Talk Morgan Expert
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Talk Morgan Expert
Joined: Sep 2010
Posts: 2,396 Likes: 14 |
Jeremy, I had exactly the same problem on my 3.9, put a live from your battery to the pump, it will probably work! I replaced both of the Lucas Bosch relays, same problem.
These deteriorate on the shelf when new, the bakelite type thingy inside disintegrates. The Factory use Chinese made relays, I replaced mine with them, no further problems.
Moral of the story : not all Chinese stuff is cr*p!
1969 4/4
1995 plus 8
2002 Aero S1
2013 M3W
2014 Plus 8
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