Well sort of. The 'ticky-tack' aka tachometric / double relay. I remember the ones on the 505 (or 605?) were on the column, for 'testing' you'd just go straight down the middle set of pins to bypass it ( ! )
Why are these fitted to some mechanical diesel units ?
I can see that it would be useful with a petrol or HDi unit to cut the in-tank pump off however they appear to serve no purpose with an indirect injection engine at all, unless I've missed the point ?
I can see they are going to control the ECU power (as mine does) however a single relay would suffice for that without an in-tank pump.
So for safety with a petrol engine especially they are essential, I do not question that. I do question why they are fitted to vehicles without any in tank pumping arrangement though.
I suspect its parts standardisation or suchlike as on mine I do have an unused power feed (with a reasonably heavy wire!) present at the sender plug.
This is the place for posts that don't fit into any other category.
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