Overland Journal: Discovery I, 5-speed

[MuddyOval]

We see bad connectors at the pump constantly at my shop, followed closely by the fuel pump relay. Ignition switch can also cause a problem.

Buy the guy who suggested inertia switch a beer too, as those can be REALLY flakey. You can bypass it for testing, but it's a good idea to reconnect afterwards if it is not the source of the problem.

Was it a good quality pump or something from China or home-brew new motor in old housing? We've removed several "new" pumps that were "home built."

 

[Scott Brady]

Land rover genuine pump and now a new fuel filter

Is the relay a special unit, or something that is available from Autozone, etc.?

 

[Hltoppr]

Bummer, sir...wish I could help with ideas, but I know nada about D1 electrics.

I'll send you some buen suerte....

-H-

 

[MuddyOval]

I don't know of any cross-references to other manufacturers, but the Rover # is AFU2913L and they tend to run about $22.95
There are several of these same relays on other circuits, so you could probably swap some around to see if the problem migrates.

 

[cruiseroutfit]

I honestly have about zero experience on Rovers, so take my advice as such

What about oil pressure switch too? Some vehicles have an oil pressure switch that triggers the fuel pump relay, thus without oil pressure you won't get fuel. Most often different than the regular oil pressure sender, rather than a quantitative sender these are just a yes/no switch. I'm sure some Rover aficionados and chime in and clue us in if that exists on this vehicle or not.

 

[R_Lefebvre]

Ok, I'd say the first thing to do if you're thinking about the myriad of circuits that could be "flaky"... Grab a length of wire and jumper it out. Just hard wire the pump and see what happens. If that solves your problem, then start looking for the culprit circuit.

 

[Scott Brady]

Ok, just returned with a fuel pressure gauge, and no pressure from the pump, or at least no pressure between the pump and the rail port. I do not suspect a fuel filter, as I just changed it. The fuel pump is a brand new LR Genuine unit, so this is moving me in the direction of electrical supply to the pump. I will remove the drawer system later today and check for power at the harness/connector.

I will order a relay as a preventative measure. It will be good to have a spare...

 

[R_Lefebvre]

Check to see if/where your inertial sensor is and try resetting it. Just something quick and easy to do.

 

[Antichrist]

The fuel pump is a brand new LR Genuine unit

While unlikely I wouldn't rule out the pump completely, keep it in the back of your mind. Years ago I spent way too much time thinking I'd screwed something up on my '62 when I was doing a tuneup and distributor overhaul. Turned out 3 of the 4 brand new Champion plugs were defective.
When I had problems with my fuel pump I ran a jumper from the lighter to the pump to eliminate everything else in the circuit. So Rob is on the right track there.

Won't you breathe a sigh of relief once you get your diesel in?

 

[MuddyOval]

As mentioned before- inertial switch will turn off the pump too. There is no oil pressure switch interface on that Rover- they let you run it without oil pressure. Heck, the warning lamp doesn't come on till it's down to 7psi.
:Wow1:

Older Discos are cake to work on once you learn to think funny. Don't forget to check the fuse- right Tom? Tom? Fuses, right? :wavey:

 

[RoverMack]

Land rover genuine pump and now a new fuel filter

Is the relay a special unit, or something that is available from Autozone, etc.?

While trouble shooting your LR fuel pump be careful not to let the pump run "dry " (removed from the tank) for any length of time (shortens the life of your new pump).

 

[Geo14cux]

you can test power at the dr side rear wheel well.....
my bet is connector @ the pump
oh ya what year is it

 

[Scott Brady]

1995.

I will rip into everything tomorrow afternoon and advise the progress

 

[Geo14cux]

ah--------------------------- connection at the pump. betcha

 

[Hltoppr]

Loose connection would make sense....vibrates loose and no mas petrol....