revoxy
Rover Rookie
Posts: 30
Location: Linz, Austria
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Post by revoxy on May 20, 2019 10:03:57 GMT
I’m currently installing a Facet electric fuel pump and need to wire it up to a relay. I've never fitted a relay before and would appreciate someone telling me how to wire it up for this installation. Many thanks!
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Post by Warwick on May 20, 2019 11:57:03 GMT
Most relays, if not all, have the connection diagram printed on the side.
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revoxy
Rover Rookie
Posts: 30
Location: Linz, Austria
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Post by revoxy on May 20, 2019 12:56:30 GMT
Most relays, if not all, have the connection diagram printed on the side. Thanks for replying but I was hoping for a little more detail as the relay I have does not have a diagram printed on it.
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Post by Phil Nottingham on May 20, 2019 13:09:18 GMT
You need to tell us what the terminal markings are. It is not usual to need to install a relay for an electric pump. What is the current draw?
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revoxy
Rover Rookie
Posts: 30
Location: Linz, Austria
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Post by revoxy on May 20, 2019 13:38:48 GMT
You need to tell us what the terminal markings are. It is not usual to need to install a relay for an electric pump. What is the current draw? The relay's terminals are marked: 85, 86, 87 & 30.
It's a solid-state Facet 40105 pump which I believe draws .75 to 1 amp.
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Post by johnwp5bcoupe on May 20, 2019 14:22:17 GMT
There is no need for a relay!! however the coil is 86 and 85, normally open contacts 87 and 30.
Curiosity why do you think you need a relay?
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revoxy
Rover Rookie
Posts: 30
Location: Linz, Austria
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Post by revoxy on May 20, 2019 14:53:45 GMT
There is no need for a relay!! however the coil is 86 and 85, normally open contacts 87 and 30. Curiosity why do you think you need a relay? Thanks, John. Much appreciated.
Whilst researching the installation of this pump, and electric fuel pumps in general, I noticed some websites installation instructions included adding a relay. However, I'm happy to know that it's not necessary here.
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Post by johnwp5bcoupe on May 20, 2019 18:41:11 GMT
No problem Andrew it will save you some grief not using a relay! to be correct wire it from the ignition terminal if not on the fused side fit an in line fuse, there is a spare terminal! you should use a fuel cut off valve in case of an accident Fit the pump low down if you can?
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Post by Sam Bee on May 20, 2019 19:12:21 GMT
Just to add a little. The older type of pump did require a relay as the load is quite high. The fuel cutout John refers to is an Inertia Switch, which is connected into the wire supplying the pump - one wire from the inline fuse and another to the pump; they are readily available at modest cost on ebay (I use Land Rover ones); mount vertically in the engine bay in an accessible spot.
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Post by richardlamsdale on May 22, 2019 9:24:47 GMT
I also fitted an inertia cut-off switch (from a Range Rover) for the electric fuel pump when I re-wired my car. I mounted it vertically on the bulkhead next to the fuse box. You can also wire the inertia switch to cut the supply to the ignition coil so the engine stops immediately the inertia switch is actuated, but then you really do need a relay.
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