Classic cars forum & vehicle restoration.
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ukdave2002
Joined: 23 Nov 2007
Posts: 4353
Location: South Cheshire
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 Posted: Thu Jul 09, 2026 11:38 am Post subject: |
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If its a Ray described; CPU operates a relay directly, it would be easy to add or try a remote pump, if its on a CAN it may be more tricky as there may be some acknowledgement required from the pump module.
Given the age of the car its probably the former. |
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Ray White
Joined: 02 Dec 2014
Posts: 7550
Location: Derby
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| Posted: Thu Jul 09, 2026 12:18 pm Post subject: |
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| ukdave2002 wrote: | If its a Ray described; CPU operates a relay directly, it would be easy to add or try a remote pump, if its on a CAN it may be more tricky as there may be some acknowledgement required from the pump module.
Given the age of the car its probably the former. |
These cars do have a CAN but at this point in time the fuel pump had not yet been integrated.
I have been mulling this over and in my clumsy way what I am trying to say is that the ECU doesn't know one pump from another... so if the wires that go to the old pump are sent to the new 'in line' one it should be O.K.
(Famous last words of course)
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alastairq
Joined: 14 Oct 2016
Posts: 2211
Location: East Yorkshire
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| Posted: Thu Jul 09, 2026 3:59 pm Post subject: |
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One could always disconnect, if reachable, the wires from the in tank pump connections, plug them into a suitable clacky electric high pressure pump, and see if it clacks with ignition turned on?
_________________
Dellow Mk2, 1951 built, reg 1952.
Fiat 126 BIS
Cannon special [1996 registered. Built in 1950's]
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Ford Pop chassis, Ashley 1172 bodyshell, in pieces. |
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Ray White
Joined: 02 Dec 2014
Posts: 7550
Location: Derby
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| Posted: Thu Jul 09, 2026 4:36 pm Post subject: |
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| alastairq wrote: | | One could always disconnect, if reachable, the wires from the in tank pump connections, plug them into a suitable clacky electric high pressure pump, and see if it clacks with ignition turned on? |
I am sure you are right. I don't see why it would not work. One might even regard it as an improvement!
I should have done that when my Range Rover petrol pump failed but it would have involved spoiling the fitted interior. In the end I just let a Land Rover specialist replace the pump from underneath. It needed a lift to raise the car high enough off the ground to allow the tank to drop down so the pump could be extracted from it. |
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ukdave2002
Joined: 23 Nov 2007
Posts: 4353
Location: South Cheshire
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| Posted: Thu Jul 09, 2026 5:01 pm Post subject: |
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| I'd first check the relay, including is there a demand on it (which I'm sure Rick will have already done), if its working, pop it out, quirt 12v down the relay output and see if its drawing any current, if yes and there is no fuel pressure then it looks as if the pump has a mechanical fault, if no current draw then we either have a faulty connection or electrical fault with the pump. Narrowing it down is how to solve electrical faults. |
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Rick
Site Admin
Joined: 27 Apr 2005
Posts: 22932
Location: UK
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