I'm plumbing in an electric fuel pump into Mrs Swifty's Spit 6, and need a bit of advice...
I want to use a relay. I can do the basic wiring into the system but want it to incorporate the oil pressure switch (for obvious safety reasons) Can any of you knowledgeable folk who have done this already provide me with an idiots guide and/or a wiring diagram (including the numbers of the relay terminals and where they go ) Many thanks in anticipation
I wouldn't use an oil pressure switch, but rather one that cuts out after an impact. EBay search inertia switch, I have one from a landrover. Then again my car won't fire unless there is pressure in the fuel system, so would be catch22. No fuel no run, no oil pressure back to the beginning.
Reading again it does not work, an too swifty answer. This way the pump only pumps when engine not running. It can be done with an extra relay and i can send you a diagram but an impact switch is the easiest way.
Or even better a fuel pump relay that works with induction. A few gpb's and ready to fit.
I cannot find one on your ebay but will give some hella numbers this week. It's connected as a normal relay but also on the coil -. When the ignition is on the pump does not run. Only when cranking and running because of the ignition signal. When the engine stalls but ignition is still on the pump will stop because of non running. Almost every injection car of the '90 has an hella or bosch relay of this type. In Holland it's also compulsory on LPG vehicles. Ignition on, engine off, lpg electro valves closed.
Okay, I understand the impact switch circuit and could wire that in no problems...
As for the fuel pump relay - how would that be wired in, and which relay would I use? (I got over 1000 replies on ebay and all the relays seemed different to each other... )
I could also not identify the right one. The std ones are wired the same as a normal relay but have also a pin that's connected to coil -. It's like a normal relay but only switches on when the engine runs. When ignition is on but engine not running the pump stay's off. In case of an accident the engine stalls but ignition stay's on the pump is off.
Sorry but that isn't what you want on a carb system unless I misunderstand you....
You want the pump to prime the carbs when the ignition is switched on, not necessarily running.
An inertia switch will cut you off...if things go wrong. Stags and PI's have them....
With EFI its different....you dont want it pumping away at high pressure unless the engine is running...
Jag XJ has the right relay setup....bosch pump in the boot etc...so it starts but immediately cuts out with relay deactivated....
Jonners
Note from Admin: sadly Jon passed away in February 2018 but his humour and wealth of knowledge will be fondly remembered by all. RIP Jonners.
My spit is efi, but efi won't run unless the pump is running.
Modern cars have the furl pump fire up when the ignition is switched on, to get pressure in the system, but will cut out after a few seconds. Irritating when you are draining a mondeo fuel tank of several gallons of fuel, had to keep flicking the ignition on and off. Still, saved the £50 fuel from the trade in chaps, and the car only got a pittance.
You might need a regulator if the pressure's too high because the carbs will overflow. Steve W. had one fitted to one of his 1850s because of this.
Toledo Man
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cliftyhanger wrote:I wouldn't use an oil pressure switch, but rather one that cuts out after an impact. EBay search inertia switch, I have one from a landrover. Then again my car won't fire unless there is pressure in the fuel system, so would be catch22. No fuel no run, no oil pressure back to the beginning.
If you do fit an inertia switch be careful where you fit it as potholes and driving onto kerbs could activate it.
Bulkhead is probably the best location.
Some people are like Slinky's, they serve no real purpose in life but bring a smile to your face when you push them down the stairs.
Thanks everyone - some good advice here. I have accumulated all the necessary bits (including a regulator, thanks Toledo Man ) and will be wiring it up at the weekend. Fingers crossed [-o<
Having successfully wired in the fuel pump, I am now onto a Kenlowe fan. I want to include an override switch, and there seem to be numerous variations in wiring one in, so I thought I'd get a bit of extra advice before plumpling for one of the wiring set-ups . With that in mind, can any of you knowledgeable folk advise me which of these two systems is the best/has the least set-backs (if any) or are they just equal ways of doing the same job differently...
) Many thanks in anticipation
)
) and will be wiring it up at the weekend. Fingers crossed [-o<
