Transit EFI ????

[rover]

The problem with using a different pump is that it will run at different pressure to the one designed for the Pinto EFI, the injectors are preset to open at a certain pressure.

Rover.

[madvanman]

The problem with using a different pump is that it will run at different pressure to the one designed for the Pinto EFI, the injectors are preset to open at a certain pressure.

Rover.

i thought that was on the non Efi systems, Electronic Fuel Injection as the name implies are controlled electronically although fuel pressure will affect the amount of fuel that passes through the injector when its open.

[rover]

I thought that was a simple way to explain it....Perhaps I should have been more precise

On EFI systems the injectors will 'pulse' whenever the engine is cranked(assuming the electronics are working properly) but fuel will not flow unless the fuel pressure regulator is getting the correct pressure from the pump, too little and it wont open at all, too much and it will just open the bypass valve and let the fuel go back to the tank.

Many of todays non-starters are caused by such problems, mainly on European cars but some of the 'brits' (I hesitate to use that word nowadays!) also suffer the same, thats why diagnostics are soooo important.....at one time you could say "well the pumps running" and discount it as a cause of trouble, but not since everything else went electronic too

Rover.

[Luke]

I thought that was a simple way to explain it....Perhaps I should have been more precise

On EFI systems the injectors will 'pulse' whenever the engine is cranked(assuming the electronics are working properly) but fuel will not flow unless the fuel pressure regulator is getting the correct pressure from the pump, too little and it wont open at all, too much and it will just open the bypass valve and let the fuel go back to the tank.

Many of todays non-starters are caused by such problems, mainly on European cars but some of the 'brits' (I hesitate to use that word nowadays!) also suffer the same, thats why diagnostics are soooo important.....at one time you could say "well the pumps running" and discount it as a cause of trouble, but not since everything else went electronic too

Rover.

we had this problem on me dads sierra - wound run at all then next minute ran ok for 100yds - turned out to be the pump not making enough pressure - fuel (seemed to be high pressure) at the injectors, all the rest was there spark etc. very annoying fault in the end we fitted a rover vittesse pump and it ran ok
we even tried the old pump in a bucket of petrol and it still pumped well just not well enough!!!!

[Nighthawk]

pump pressure is a major factor in sefi systems, even after all the time we've had them we are still having troble with them

mondeo ST220 is a perfect example of it, starts runs OK at low rpm, then give it the message and the revs struggle to get above 4k because of the fuel starvation