Geoff Lovegrove Posted April 24, 2021 Report Share Posted April 24, 2021 A bit of advice please. I have a 1972 CP TR6 which has been going very well, I went to start yesterday and immediately knew I was in trouble - no noise from the fuel pump and no waring lights. The engine turned as well as usual and the warning lights appeared but of course did not start. So far I have checked fuses - all OK and the inertia switch which although in position was actually not connected, I have discovered this has already been bypassed - the wires have been joined and sit underneath the switch. Where to start - any advice much appreciated. Geoff Quote Link to post Share on other sites
cp25616 Posted April 24, 2021 Report Share Posted April 24, 2021 Geoff 1st thing is to establish you have power at the fuel pump, I presume its a standard Lucas pump? This is easily done using a simple light bulb, like the type fitted to the rear lights. If you have power to the pump then that rules out any fuse issue so basically it must be the pump itself. However I for one can'r remember a Lucas pump just giving up like that, cavitation yes but not a total seizure, let us know please? Regards Alan G Quote Link to post Share on other sites
aardvark Posted April 24, 2021 Report Share Posted April 24, 2021 Geoff. Have you checked for current at the pump? Have you got the pump wired via a fused relay and if so have you checked those too? Cheers Dave Quote Link to post Share on other sites
BlueTR3A-5EKT Posted April 24, 2021 Report Share Posted April 24, 2021 Have you got a grey plastic thing attached to the bulkhead under the bonnet that looks like this? If so pull the small diameter top bit upwards till it clicks then push it back down again. This is the inertia cut out switch which is a direct electrical connection from electrical power to the fuel pump and they do go high resistive. Quote Link to post Share on other sites
rwest Posted April 24, 2021 Report Share Posted April 24, 2021 10 hours ago, BlueTR3A-5EKT said: Have you got a grey plastic thing attached to the bulkhead under the bonnet that looks like this? If so pull the small diameter top bit upwards till it clicks then push it back down again. This is the inertia cut out switch which is a direct electrical connection from electrical power to the fuel pump and they do go high resistive. Geoff mentioned that the inertia switch being bypassed in the original post. Geoff - I would suggest replacing and re-instating the inertia switch anyway, you really don't want a 125psi jet of petrol going into your engine bay if you have an accident. Quote Link to post Share on other sites
Yellowperil Posted April 24, 2021 Report Share Posted April 24, 2021 I had a similar thing recently, turned out to be a failed relay Quote Link to post Share on other sites
Mk2 Chopper Posted April 24, 2021 Report Share Posted April 24, 2021 Sounds like you have a few electrical issues, with the warning lights not coming on, perhaps the ignition switch is failing. As the others have said, check you have power to the fuel pump first, if you do the problem is the pump, if you don't check you have power from the ignition switch to pump. Gareth Quote Link to post Share on other sites
astontr6 Posted April 25, 2021 Report Share Posted April 25, 2021 16 hours ago, Mk2 Chopper said: Sounds like you have a few electrical issues, with the warning lights not coming on, perhaps the ignition switch is failing. As the others have said, check you have power to the fuel pump first, if you do the problem is the pump, if you don't check you have power from the ignition switch to pump. Gareth In situations like this you really need a Multi-meter to find out where the voltage stops. Good points are raised in the thread above. Years ago I did have a Lucas pump give up outside a Lucas dealership where it was easy to sort. So they can die without notice. Lastly you say that the inertia s/w has been bypassed. How good is the cable jointing as this may be the cause of the problem? Bruce. Quote Link to post Share on other sites
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