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fuel supply for injection conversion

Paul (Notts) - 21/9/09 at 06:24 PM

In the process of converting to Megasuirt and EFI.

I currently have a low pressure pump supplying the engine bay at 6psi and a good flow rate.

instead of removing all the low pressure system and fitting a high pressure pump and return via the tunnel could I have some sort of tank / swirl pot fitted at the front and run a high pressure pump from that.

if so what sort of container do I need.

+ the injectors run from two fuel rails as in the diagram. can I get a regulator that will work as in the diagram

Paul
Rescued attachment fuel.JPG

clairetoo - 21/9/09 at 06:27 PM

The high pressure pump should feed into one end of the rail , then to the other rail , with the pressure regulator on the other end (the return to the swirl pot)
And maybe a return from the top of the swirl tank ?

[Edited on 21/9/09 by clairetoo]

Paul (Notts) - 21/9/09 at 06:30 PM

The injection system is a rover v8 thor manifold and the injectors have one feed in only as in the diagram.

Paul

flak monkey - 21/9/09 at 06:31 PM

What claire said.

Feed from low pressure pump goes into one side of the sirl pot

Return from rail goes via regulator to the other side entry.

Top connection goes back to tank

Bottom conntection gravity feeds high pressure pump.

David

MikeRJ - 21/9/09 at 06:32 PM

quote:
Originally posted by Paul (Notts)
instead of removing all the low pressure system and fitting a high pressure pump and return via the tunnel could I have some sort of tank / swirl pot fitted at the front and run a high pressure pump from that.

The trouble is with no return to the tank from the swirl pot, there is no way for any air to get out of the swirl pot apart from the injectors.

clairetoo - 21/9/09 at 06:35 PM

quote:
Originally posted by MikeRJ

The trouble is with no return to the tank from the swirl pot, there is no way for any air to get out of the swirl pot apart from the injectors.

Also with no through flow on the fuel rails , all the air has to go out through the injectors from the high pressure system , thats why its normal to have the return from the opposite end of the rail .

Paul (Notts) - 21/9/09 at 06:49 PM

The fuel rail does have a bleed valve to remove initial air pockets.

The main question seems to be answered, I can use a swirl pot and run a high pressure pump at the front.

May well have new fuel rails made up to form a loop system vial a reg to the return

Any ideas of the cost for two fuel rails for a RV8 flak monkey?

Paul

flak monkey - 21/9/09 at 06:53 PM

quote:
Originally posted by Paul (Notts)
The fuel rail does have a bleed valve to remove initial air pockets.

The main question seems to be answered, I can use a swirl pot and run a high pressure pump at the front.

May well have new fuel rails made up to form a loop system vial a reg to the return

Any ideas of the cost for two fuel rails for a RV8 flak monkey?

Paul

I have literally just ordered some fuel rail blank from the US - too late to add some more to the order now sadly.

I will do another order in the future if there is interest.

You will need a 4' length to do a RV8 i should think (though I made 2 off 4 pot rails from a 3' length)....

If so you would be looking at around the Ł100 mark for a pair, drilled to suit injectors and with 8mm hose connections supplied. You would need to fit brackets

David

Paul (Notts) - 21/9/09 at 06:54 PM

will keep this in mind.

Thanks

Paul

clairetoo - 21/9/09 at 06:58 PM

Whatever you do , dont buy it from this shark

flak monkey - 21/9/09 at 07:00 PM

quote:
Originally posted by clairetoo
Whatever you do , dont buy it from this shark

I must be too cheap

That really is taking the pi55!!

Werner Van Loock - 21/9/09 at 07:04 PM

This is what I'd do and plan to do for the 4age (but with only 1 fuel rail off course)

injection

[Edited on 21/9/09 by Werner Van Loock]

Dusty - 21/9/09 at 08:28 PM

I think you can get away with a single feed to the rail although it's not ideal. Not going to be a problem when running but you will have vapour and air problems at start-up which can only escape the rail through the injectors. Much better to have the regulator under the bonnet immediately after the rail.
Rescued attachment 2injection.jpg