21 replies to this topic

[fikus01]

mini sprocket im so glad you wrote all that!! saved me doing, it, hehe

[Major Burkenshaw]

The SPi uses a submersed, electric tank pump for the reason that the injection system needs a constant supply of high pressure fuel.

So surely if i use the mechanically driven pump on the spi engine, it will give a pulsed fuel pressure? As you said..... Spi requires constant high pressure

Would fitting a pressure regulator resolve the issue of no constant pressure from the mechanical pump

I'm confussed

[Sprocket]

Dopey me

You will need to use the electric pump if you are using the fuel injection.

Im confused. I thought he was using a carb.

The SPi uses a submersed, electric tank pump for the reason that the injection system needs a constant supply of high pressure fuel.

So surely if i use the mechanically driven pump on the spi engine, it will give a pulsed fuel pressure? As you said..... Spi requires constant high pressure

Would fitting a pressure regulator resolve the issue of no constant pressure from the mechanical pump

I'm confussed

Just checked, and indeed the auther of this topic is using a carb.

Do not confuse matters further with your project. You are using fuel injection and need the electric pump with a return line and pressure of 15psi.

If you are using a carb on an injection engine in a carb car with a suction feed tank and mechanical pump you cannot use the injection.

If you are fitting a carb to an injection engine in an injection car, you need to fit a pressure regulator where the injection manifold would normaly be to lower the pressure to 4 psi.

If you are fitting an injection engine into a carb car and using the injection system, you need to fit an injection high pressure pump at the tank, install a return line to the tank and all the wiring to go with the ECU.

Did i miss anything

Edited by Mini Sprocket, 21 October 2006 - 08:46 PM.

[Major Burkenshaw]

If you are fitting an injection engine into a carb car and using the injection system, you need to fit an injection high pressure pump at the tank, install a return line to the tank and all the wiring to go with the ECU.

I had decided to use an electric fuel pump fitted to the bulkhead and T-piece the return into the suction side of the pump. I was going to fit rigid fuel lines on the tank end to stop the pump suction pressure collapising the feed pipes. Do you think this will work?

I did have a thought of geting the pump from the Spi tank and mounting it into my Clubman estate fuel tank, although i wasn't sure if this would work as the Spi tank is pressurised and the C.E tank has a to atmosphere vent.

Sorry for the thread hijack

[Sprocket]

Its not pressurised, its sealed. The vent then passes through the charcoal canister. This is an emissions control device.

why should using the electric pump in a vented tank be any different. Mounting the pump on the bulkhead may cause vapour lock in the pump and, if its a rotary vane it will be knackered in minuts. Best place for these pumps are by the tank it self, preferebly lower than or at least the lowest point.

I did say where to fit a pump either way in you topic.

Have you got it running yet?

[Major Burkenshaw]

Nah, the engine is all built up and on the subframe, but i found a couple of dodgy connections and burnt pins on the ecu that i had to repair. Have been busy trying to keep the other mini on the road lately, so no time to do much more. Am hopping to have it in by new years though, lol!

[Woody]

OR you could have an electric SU type pump to fill a swerl pot and the injection pump fed from there with the return feeding back into the swerl pot , this is how we are doing my injected mini van (well this is the plan so far )