Thread: Replacing fuel pump questions.

Inertia switch is under dash, near steering column. LH side of column IIRC. Small black box with a stick looking plunger poking out the top. Has 2 White with purple trace wires going in and out of it, reasonably heavy gauge as these are fitted AFTER the relay.

The possible cause is also a failure of 1 or more injectors. I have seen a few early LPG installations that actually switch OFF the pump and injector pulse when using gas, this causes the fuel to boil away and gum up the fuel rail and eventually ruin the injectors.

The VN intank pumps are all I use, 30 to 38 Psi is fine. Make sure if you use an external one that it is below the level of the tank, or at least level with the bottom of it to give the pump some head of pressure. The VL etc used a low pressure intank prime pump to feed the external one. Otherwise it'll scream away and have a little less delivery volume and pressure.

JC

On the early EFI disco's, the inertia switch is in behind the panel under the steering wheel, on the LHS. A rectangular black box with a button on the top much like an old door lock button.

As to wearing the pump out - does you gas system isolate the pump when you run on gas? It may be just ordinary wear if the pump is always on.

I wired my system so the gas switch also energises a cut out relay on the fuel pump circuit. The simple version is to remove the fuel pump fuse.

EDIT: I type slower than JC....

Originally Posted by langy

On the early EFI disco's, the inertia switch is in behind the panel under the steering wheel, on the LHS. A rectangular black box with a button on the top much like an old door lock button.

As to wearing the pump out - does you gas system isolate the pump when you run on gas? It may be just ordinary wear if the pump is always on.

I wired my system so the gas switch also energises a cut out relay on the fuel pump circuit. The simple version is to remove the fuel pump fuse.

EDIT: I type slower than JC....

In one of the other threads, it says that some LPG installers reccomend having the fuel pump staying on as it will keep the fuel rail cool, and stop it from gumming up.
Thanks for you help fellas, I'll go have another look.

When I fit LPG I don't isolate the petrol pump because of injector failures. A new pump is far easier to fit than a set of injectors. Pumps last 160 000km or so with or without LPG. Without LPG its a towtruck job. If you run out of petrol your pump will last a few hours at the most, then stop. Then your injectors will dry out and fail within a few weeks.
The Bosch part number sounds like the universal kit I use, I have done 3 or 4 and they haven't come back with problems. It just depends on how easy access to your pump is. If there is a LPG tank on top of your floor access you swear a bit more, but usually you can lift a tank enough without disconnecting it.

Can't find the dang inertia switch anywhere. Below the steering wheel cover, and behind the fuse box, the wires from the fuel fuse(purple/white) one just goes into the engine bay with all the other wires, the other has been wired to two black wires, that I'm fairly certain, also just run into the engine bay.
I found a car alarm though that I didn't know was there, and heaps of disconnected plugs, and cut of wires carrying on hte theme of the rest of the car.
The pump worked again the other day, and the car ran very poorly stationary, I had to blip the throttle to keep it alive, and it sounded ill. after I turned of the ignition it wouldn't work again, I fiddled with everything I think I touched before, but to no avail

Ok. If all else fails & it's a crossover model, check behind the washer bottle for a rubber topped button.