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Offgrid · Apr 25th, 2024, 08:55

Here are the images of the two failed relays -

For a larger image, then please click -> failed 740 fuel pump relays

The image on the left is the one that pumps when the ignition is off, and doesn't when the ignition is on.This may follow the guidelines of our current government, but it isn't quite what is needed in a Volvo fuel system. You can see the disconnected wire in the right hand image - it is the thick black one on pin 30. The equivalent is braided copper in the left image. It should be a simple task to resolder the connection, and I'll post the results when I get round to it.

The more interesting project is the repair of the older relay. My guess is that the component with the copper coil has failed, and I wonder if I can purchase a new "black box" as used on the later unit, and just solder that onto the board. The circuit board and other components look the same as the newer one.

I found this on Google - https://www.aliexpress.com/item/4001341897537.html
Has anybody used Ali Express?

Apr 25th, 2024, 08:55	#16
Offgrid Offgrid camper Last Online: Yesterday 16:09 Join Date: Apr 2022 Location: Havant	Here are the images of the two failed relays - For a larger image, then please click -> failed 740 fuel pump relays The image on the left is the one that pumps when the ignition is off, and doesn't when the ignition is on.This may follow the guidelines of our current government, but it isn't quite what is needed in a Volvo fuel system. You can see the disconnected wire in the right hand image - it is the thick black one on pin 30. The equivalent is braided copper in the left image. It should be a simple task to resolder the connection, and I'll post the results when I get round to it. The more interesting project is the repair of the older relay. My guess is that the component with the copper coil has failed, and I wonder if I can purchase a new "black box" as used on the later unit, and just solder that onto the board. The circuit board and other components look the same as the newer one. I found this on Google - https://www.aliexpress.com/item/4001341897537.html Has anybody used Ali Express? __________________ Cinderella ( Cinders ) - 1988 Volvo 740 saloon with B230E engine The Hoe - 1990 Volvo 740 estate with B200E engine The House - 2005 LDV Convoy hightop with Ford Transit turbo engine. Save Old Cars Last edited by Offgrid; Apr 25th, 2024 at 09:16.