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Fuel pump question


Freshman Member
i just converted my 66 bj8 to negative earth and purchased a new su negative ground fuel pump. I checked the power coming in to the pump and I’m getting 12 v ,the ground wire is properly attached to the mount bracket bolt and when I turn the ignition on I only hear a click, the pump is not cycling like it should .could this be that the pump is not properly grounded or is it something else? I retained the su pump box and it is marked negative ground. Thanks in advance for any advice you can offer.
Country flag
What kind of pump, points or electronic (points pumps can be polarity-sensitive depending on what they use to shunt the back current from the coil)? If it's a points pump, the points can oxidize sitting on the shelf and may need to be cleaned to function properly, if it's a solid state pump it could be defective. Also, the ground wire is usually attached to a spade lug on the screws on the coil body; the pump head is effectively isolated by the diaphragm. If you've attached the ground wire to a mounting stud, that may be the problem. Can you post a photo of your installation?


Freshman Member
Good morning Thanks for the prompt reply! This pump is a brand new solid state genuine su - ground. I will play around with the ground wire. I completely replaced this wire as it was buggered. I’ll also contact Moss this morning to see if they have had problems with these pumps in the past, have a great weekend! -jeff
Country flag

Start at the beginning:

If the pump is not yet installed bring known-to-be-good power and ground to it (e.g. from a battery or benchtop 110VAC--->12VDC power supply) and see if it runs.
If it is installed bring NEW wires, again direct from the battery, to it.
Report back....
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