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Post by p5coupepaul on Feb 26, 2018 19:40:56 GMT
hi all
I fitted a electric fuel pump on my 1970 p5b sept time last year.
When starting I turn the key then upon hearing a ticking noise approx 15/20 secs I proceed to start but still takes a while for the fuel to get up and the engine to fire up.
The pump is situated in front of the coil in the engine bay on inner side of the wing.
Firstly is it in the right position ??
Or does it have to be nearer the back ie tank underneath ??.
so it gives it better pulling power .
cheers
paul
here are the details of my pump
Facet style 12v electric fuel pump
6-8psi
flowrate upto 150 ltr/hr
8mm inlet/outlet.
is this ok for the car
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Post by johnwp5bcoupe on Feb 26, 2018 21:21:33 GMT
Paul there is loads of info if you do a search this has been covered so many times, a low position is best on a x member this is where mine is fitted you get a bit of syphon effect!  |
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Post by lagain on Feb 26, 2018 21:29:11 GMT
Mine is also on a crossmember under the car, in front of the reserve switch.
When the ignition is on I can hear the petrol running back into the tank and she still takes some churning before she starts and always has done. It must be a characteristic of P5bs, but not a bad thing as it gets the oil moving.
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Post by petervdvelde on Feb 26, 2018 21:58:48 GMT
As John says a lower position is better and it also depends on what kind of pump/brand you have. There are pumps that can only push and not pull (suck) the fuel and others can do both
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Post by p5coupepaul on Feb 27, 2018 8:33:36 GMT
ive just added the pump details to my message if that helps
cheers
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Post by davewright on Feb 27, 2018 9:00:00 GMT
My electric pump is in the boot under the fuel tank. I believe this is the best place as it means the fuel is being pushed rather than sucked so avoids the vapour lock problem that occurs with most Rovers. It does mean that I don't have a reserve system but I don't find that to be a problem.
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Post by p5coupepaul on Feb 27, 2018 9:18:07 GMT
hi dave
thanks for getting back
don't suppose you have any pics to hand ?
also where did you get the power feed from ?
mine is currently off one side of the coil
cheers
paul
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Post by petervdvelde on Feb 27, 2018 9:22:38 GMT
Facet advises to fit their pumps as close as possible to the fuel tank but a lot of people fit it in the engine compartment and functions well. Do you have problems?
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Post by p5coupepaul on Feb 27, 2018 9:33:22 GMT
yes still taking quite a while for the engine to fire up.
ive contacted the supplier they say its got to be near the tank for bottom operation.
cheers
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Post by davewright on Feb 27, 2018 9:48:28 GMT
I will get a picture at lunch time. The feed is taken from the fuse box - the feed that comes on with the ignition (top one I think).
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Post by p5coupepaul on Feb 27, 2018 9:51:59 GMT
Thanks dave
Your a gent
cheers
paul
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Post by davewright on Feb 27, 2018 14:31:45 GMT
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Post by p5coupepaul on Feb 27, 2018 15:20:57 GMT
Thanks for your time on this dave.
Ill sort this out over the weekend
Thanks again
Paul
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Post by davewright on Feb 27, 2018 16:28:53 GMT
I did not fit the pump. The car came with it like this. I do find it works well and have not had any problem in hot weather. I also get a decent warning of the fuel running out as I hear the pump when the tank is empty but the pipe to the engine is still full.
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Post by petervdvelde on Feb 27, 2018 17:14:10 GMT
Paul,
You could consider to fit an inertia switch which switches off the fuel pump in case on an collision.
Peter
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Post by Sam Bee on Feb 27, 2018 18:20:41 GMT
An inertia switch I regard as a 'must'. Have one on my P6B and plan fitting one during renovation of my P5B. The feed from the ignition is routed forward to the intertia switch in the engine bay (needs to be as far forward as practical), then back to a relay near the pump to switch a good power source on/off (this needs a fuse, usually incorporated in the relay). Relays and inertia switches are found on ebay at under £10 each.
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Post by Sam Bee on Feb 27, 2018 18:25:51 GMT
If you have SU carbs they usually do not like more that 5psi and would recommend fitting a fuel pressure regulator.
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Post by enigmas on Feb 28, 2018 5:42:45 GMT
If you've fitted a small Facet pump as shown in Peter's post (fitted to the transmission extension) you won't require a fuel pressure regulator. Just fit the pump lower than the tank.
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Post by richardlamsdale on Feb 28, 2018 16:33:44 GMT
I agree that an inertia switch is important if you have an electric fuel pump - if you have an accident you really don't want extra fuel spilling over the engine. I wired the inertia switch to 2 relays - one for power to the fuel pump and one for power to the coil. Probably a bit over the top but I thought I might as well whilst I was fiddling. I used the inertia switch fitted to modern Rovers and Range Rovers. It's a changeover contact, so you can also wire a warning light to show the inertia switch has been 'triggered'.
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Post by enigmas on Feb 28, 2018 22:19:59 GMT
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Post by Warwick on Mar 9, 2018 22:28:43 GMT
A really old technique was to power the fuel pump via a relay wired to the oil pressure sensor.
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Post by petervdvelde on Mar 9, 2018 22:51:55 GMT
A really old technique was to power the fuel pump via a relay wired to the oil pressure sensor. I have an RV8 oil pressure sender with a third contact for the fuel pump. I think it comes from an SD1. For the best function of this set up, there is an additional wire which runs from the starter motor solenoid connection (the same connection which is used to bypass the ignition ballast resistor) to the fuel pump. This gives the fuel pump power when the engine is started so the fuel pump gets power before there is oil pressure. Peter |
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Post by djm16 on Mar 10, 2018 0:00:59 GMT
With all due respect Peter, I think you have that back to front.
When the engine is not running, and there is not oil pressure, the oil light will be on, and the third connection will be open circuit. When the engine is running and there is oil pressure, the line to the oil light will be open circuit and the line to the petrol pump will close, enabling the petrol pump to operate.
I am not saying that is how it is, but that is how it might sensibly be wired.
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Post by petervdvelde on Mar 10, 2018 10:03:00 GMT
Hi DJM, I had a look in my SD1 workshop manual and it is a SD1 set up and it functions as i described earlier. The oil pressure switch seems to have a "make" contact when oil pressure comes up for the fuel pump.[ Underneath a copy of the wiring diagram. Pos 49 is the oil pressure switch and pos 55 is the fuel tank and pump unit and pos 2 is the starter motor and solenoid  Peter |
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Post by p5coupepaul on Mar 27, 2018 17:52:00 GMT
been mentioned on this post that I should fit an inertia switch .
Firstly where would it be situated on the car and where is the best place to buy one.
Been looking but getting any good advice.
cheers
paul
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