The 3000 Forum
Positive earth fuel pump conversion
 Woking, Surrey, UK
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Hi guys , Can anybody tell me how to convert this positive fuel pump to negative if possible . It seems a waste to not be of any use.
Many thanks
Richard
Many thanks
Richard
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Jan 25, 2026 01:07 PM
Top Contributor
 Joined 8 years ago
248 Posts
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Richard,
Go to eBay and buy a 1.5KE24CA TVS diode, usually around $7 for five of them.
Remove the existing Varistor and wire the TVS between the two posts I circled in red.
Basically across the points, point blade screw and ground screw.
You can solder the leads to the cut-off brass terminal tags of the old Varistor.
This will make the pump useable on both positive and negative ground systems.
The TVS will limit the back EMF to 24 volts instead of several hundred volts. The points will last forever.
Domenic
Edited 1 time(s). Last edit at 2026-01-25 01:10 PM by Domenic.
Go to eBay and buy a 1.5KE24CA TVS diode, usually around $7 for five of them.
Remove the existing Varistor and wire the TVS between the two posts I circled in red.
Basically across the points, point blade screw and ground screw.
You can solder the leads to the cut-off brass terminal tags of the old Varistor.
This will make the pump useable on both positive and negative ground systems.
The TVS will limit the back EMF to 24 volts instead of several hundred volts. The points will last forever.
Domenic
Edited 1 time(s). Last edit at 2026-01-25 01:10 PM by Domenic.
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Woking, Surrey, UK
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