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MG MGB GT V8 Factory Originals Technical - Rover FI ful rail connections

For reasons not worth discussing, I need to know what goes where for the 3 hose connections on the Rover fuel injection fuel rail. This is a hot wire system, 1990 vintage. I do know about the sensor connections, just not the hose ends.

Connection #1 is the bare end of the fuel rail

Connection #2 is the side of the fuel pressure regulator pointing inward relative to the shape of the rail.

Connection #3 is the outer side of the regulator.

I don't think there is a connection #4 - please confirm.
Jim Stuart

Jim,

Connection #1 is the supply to the fuel rail

Connection #2 is the vacuum from the plenum to the fuel pressure regulator.

Connection #3 is the fuel return.

There isn’t a Connection #4

Geoff
Geoff King

Hi Jim,
I am trying to source the correct adaptor to allow you to attach the hose to the screw on part of #1. The Rover part is something like $80 !!

I believe it is a 12mm x 1.0 mm thread. I will be visiting our local speed shop today as there is a 12mmx1mm to 4AN adaptor available that might fit.

More news to follow

Regards
Tony
Tony Bates

Jim, I hope I'm reading this right. The connection on the LH rail is fuel input. the front one on the RH side is the cold start inj. & rear one is to the reg.Barrie E
Barrie Egerton

Geoff-

Where on the plenum is the vacuum connection?

Thank you for your original reply.


Jim
Jim Stuart

Jim,

It passes through the air valve housing on the rear face of the plenum.

Barrie,

The rear connection to the fuel rail is the supply, in front of that, on the end of the rail, is the fuel pressure regulator and the return. On the plenum side of the regulator is the vacuum. There isn't a cold start injector on a hot wire system.

Geoff
Geoff King

I guess I didn't read it right ! Barrie E
Barrie Egerton

Geoff-

Thanks again for the help.

Jim
Jim Stuart

This is interesting. Just to add color to the thread, I used a Rover fuel rail on my supercharger intake, but it doesn't sound like what Jim described. Maybe it is a later rail. It has an open tube with a tab above and one below for screws to hold the regulator which slips into the open tube, and then the other end has a 5/16 OD tube bent at a right angle out from the rail. Naturally my use of it was upside down and backwards so to speak as I used the regulator connection for the inlet, the inlet to connect to a ford regulator, and put the connections at the front of the engine rather than the rear. To connect to the regulator fitting I turned a plug with an o-ring groove and a hose barb and fit the barb through a piece of 1/8" stainless strap which had holes for the bolts. The fitting on the other end of the rail was smooth so to prevent the hose connection from slipping off I used a short piece of hose connecting it to a 5/16" tube bent at 90* to go back to the regulator, and then made a piece to hold the tube against the end of the rail so that the hose clamps would only need to seal and not retain the parts. It works really well but is a bit of a pain to install because of the angle of the injectors. The type of rail I made for my truck is really a better choice because each side is a separate piece and they are connected with a short piece of fuel line. That makes it exponentially easier to fit. It turns out to be really pretty easy to make a fuel rail too (after making the 3rd set), using 3/8" hydraulic tubing, 3/4" round stock, a few drill bits of the correct sizes, a tubing bender, flaring tool and some silver solder. It could be done without the bender too in the case of the BOP/R engine. A lathe and mill are a great help as well but it could be done using just a drill press and perhaps even quicker too. If anyone has a need to make one up I can pass on some more useful tips.

Jim
Jim Blackwood

This thread was discussed between 21/03/2006 and 23/03/2006

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