Samurai 1.6 fuel pump wiring
Samurai 1.6 fuel pump wiring
Hi all,
I've had to fit an electric fuel pump as my 1.6 8v has no mechanical pump.
I've stolen an ignition live that I think was spare after removing the old aisin carb. Runs great as it is...
However, it's not ideal that the pump stays going in the event of a crash where the engine might cut out but the ignition could be left on.
Is there a simple way to get an live that is only live when the engine is running? From the coil or the oil pressure switch maybe?
What have others done?
Thanks
I've had to fit an electric fuel pump as my 1.6 8v has no mechanical pump.
I've stolen an ignition live that I think was spare after removing the old aisin carb. Runs great as it is...
However, it's not ideal that the pump stays going in the event of a crash where the engine might cut out but the ignition could be left on.
Is there a simple way to get an live that is only live when the engine is running? From the coil or the oil pressure switch maybe?
What have others done?
Thanks
Re: Samurai 1.6 fuel pump wiring
So having done some more reading, I think taking a "T" off the 12v feed from the instrument cluster to the oil pressure switch might work. I'll use this to trigger a relay to power the fuel pump.
I'll then either
A) package a non return valve on the fuel line
B) add a push button primer
or
C) fit a timer relay to prime the pump thats triggered by ignition live. Similar to glow plugs on a diesel.
Any better ideas, please let me know!
I'll then either
A) package a non return valve on the fuel line
B) add a push button primer
or
C) fit a timer relay to prime the pump thats triggered by ignition live. Similar to glow plugs on a diesel.
Any better ideas, please let me know!
- Jordi
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Re: Samurai 1.6 fuel pump wiring
If its a self priming pump shouldn’t need a priming switch.
When the engine turns over to start and the oil pressure builds the pump should kick in.
When the engine turns over to start and the oil pressure builds the pump should kick in.
1988 Samurai - Truck Cab & Tray Back - 1.6 8v & HIF44 - Snorkel - Stack Exhaust - PAS, YJs & 33s - Trussed, Gusseted & Pumpkin Capped Axles - 4.3 R&Ps - 4.16 T/Box - Rear Air Locker - Full Float Back Axle & Discs - RCV Front Shafts - X-Eng Handbrake - Custom Fuel Tank
Re: Samurai 1.6 fuel pump wiring
Thanks Jordi, that's a fair point, I'm not sure exactly hoe the pump works but judging by the in line filter between the pump and the carb it doesn't appear to drain back, so I should just try without first and see how I get on
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Re: Samurai 1.6 fuel pump wiring
Thinking about it, your solution would have the added benefit of saving your engine if you crack your oil pan or kill your oil pump. It's a pretty good idea.
1985 SJ413VX (SJ50V) with SPOA, rear disc brakes, 31x10.5R15 Kaiman Malatesta tyres, an MOT and a lot left to do!
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- Jordi
- Bow down before me
- Posts: 7535
- Joined: Sun Nov 29, 2009 2:35 pm
- Location: Darlington, Co. Durham
Re: Samurai 1.6 fuel pump wiring
The instructions for most electric pumps have them wired via the oil pressure switch for safety.
1988 Samurai - Truck Cab & Tray Back - 1.6 8v & HIF44 - Snorkel - Stack Exhaust - PAS, YJs & 33s - Trussed, Gusseted & Pumpkin Capped Axles - 4.3 R&Ps - 4.16 T/Box - Rear Air Locker - Full Float Back Axle & Discs - RCV Front Shafts - X-Eng Handbrake - Custom Fuel Tank
Re: Samurai 1.6 fuel pump wiring
Anton, I thought so too! A nice safety net
Jordi, that's interesting, mine didn't come with instructions but it makes sense.
Jordi, that's interesting, mine didn't come with instructions but it makes sense.
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- I spend far too much time on here
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- Joined: Tue Jan 12, 2010 12:12 pm
- Location: London
Re: Samurai 1.6 fuel pump wiring
I don't remember my pump having instructions either. It was a facet pump, so maybe it did and I just did the typical bloke thing and ignored everything in the box but the pump...
1985 SJ413VX (SJ50V) with SPOA, rear disc brakes, 31x10.5R15 Kaiman Malatesta tyres, an MOT and a lot left to do!
My: Build thread ● To-do list ● Pay and Play map
My: Build thread ● To-do list ● Pay and Play map
Re: Samurai 1.6 fuel pump wiring
Just an update on this..
So I did try to wire it via the existing oil pressure sensor but it's only a single pin sensor. By the looks of it you need a 2 or 3 pin sensor so that one pin can illuminate the low pressure warning light when the ignition is on or when there is genuinely low pressure whilst running. And the other pin needs to power the fuel pump relay when there is oil pressure. So for now it's still wired via the spare 12v feed from the old carb. I just need to find the correct sensor as they can be either normally open or closed depending on how the vehicles circuit is wired.
So I did try to wire it via the existing oil pressure sensor but it's only a single pin sensor. By the looks of it you need a 2 or 3 pin sensor so that one pin can illuminate the low pressure warning light when the ignition is on or when there is genuinely low pressure whilst running. And the other pin needs to power the fuel pump relay when there is oil pressure. So for now it's still wired via the spare 12v feed from the old carb. I just need to find the correct sensor as they can be either normally open or closed depending on how the vehicles circuit is wired.
Re: Samurai 1.6 fuel pump wiring
Mine's was wired up to an ignition live for years, I chose to just not crash my Sj