fuel Pump not running

[voucht]

Hi,
Like the thread about my fuel sender, I don't know if the best place for this one is in the Engine or Electricity section...

Here is my problem: I am installing everything necessary to start the engine. Chassis is still bare, only engine, gearbox, fuel tank and steering column (ignition switch) are fitted. I reinstalled the loom from the Sierra temporary, just to have everything connected to start the engine up. I am running a 2.0i DOHC. I kept the original in-tank EFI pump. The only things that are not connected yet are the fuel lines.

This morning, as I just finished to reconnect the loom, I tried to turn the main ignition switch (key) on. Everything was OK, starter was running, and not one fuse from the fusebox did blow.

Only problem : the fuel pump was not running. Why?

- I also reconnected the "intertia switch", which I guess is a switch which stops the pump in case the car is up side down.
- I checked my connections from the loom to to pump, and everything is OK and in contact.
- The fuel pump is not installed in the tank yet, and the tank has no fuel in it. I just wanted to check if it would run (I know it is not good to run the pump dry, but it was just for a few second to check).

So, does the pump need to be in the fuel to run? There are power and earth wires coming to the pump, but does the pump need to touch the fuel tank to be earthed (I don't think so)? What else on the system can stop the fuel pump to run?

Any suggestion advise or reply is welcome

Thank you very much in advance.

[flyerncle]

Does not need fuel to run pump and there is no method of sensing it on older fuel systems.

Pump should normally run for a few seconds with ign on to prime system and then when cranking by crank or cam sensor or maf sensor to tell system engine is running and continuos pump operation.

[twinturbo]

what year car is it from, have you reset the inertia switch and have you made any mods to the sierra loom?

TT

[voucht]

Thank you for the replies. Sorry I did come back to you earlier, but it was "mid-summer" celebrations in Sweden yesterday and... well, I woke up quiet late today if you know what I mean

Paul, if the pump is supposed to run when IGN is turned on, it is definitely not working on my car. I remember on the donor it was running that way, you are right, so there is definitely something wrong.

Question : can I test the pump by connecting it directly to the car battery to check if it is running, or is there a risk to burn it?

TT, no I haven't change anything on the original loom. It is exactly as it was on the Sierra. Model was 2.0i CLX DOHC from 1993.

Yesterday, I tested the voltage on the last connector where I can still identify the wires going to the pump before they get lost in the main loom. And when I turned the IGN on, no voltage. So I have to track the cable and see why the current doesn't arrive there.

Any ideas?

Thanks.

[voucht]

And TT, sorry I forgot: no I haven't reset the inertia switch. Must I do that? How do I do that?
Thanks.

[voucht]

Stupid me! I was missing the fuel pump fuse in the fuse box .

Yes, I did checked all the fuses, but all the fuses which were actually present! Today I was reading the electric diagrams on the Haynes Repair Manual, where it says the slot 23 is the fuel pump 30A fuse slot. This slot is separated from the other ones, so I haven't seen the fuse was missing before. I certainly lost it when I put the loom in a box for storing after having removed it from the donor.

So, the pump is running, no problem. Now I have to connect my fuel lines, and hopefully the engine is going to start soon

Thanks for the help.

I'll have other questions soon I'm sure

[twinturbo]

have you bypassed the imobaliser?

TT

[voucht]

I didn't know what the immobiliser was so I've had a look on the Net. I found this:
http://passionford.com/forum/cars-an...mobiliser.html

The problem is that it does not like like anything I have on my loom.
What is its purpose?
What is it connected to?
Where was it placed in the Sierra?

Perhaps the previous owner of the Siarra already bypassed it? Would it be possible?

Thank you.

[twinturbo]

it was on the lower dash panel next to the steering column.

TT

[voucht]

Originally Posted by twinturbo

it was on the lower dash panel next to the steering column.

TT

Now I'm sure I don't have it.
My sierra was not a 1993 but a 1992 model, I was wrong on the previous post. So perhaps it was not equipped with this device?
My other guess is as the previous owner added/removed/changed many things things on the car, like extra lights, neon in the trunk, extra gages, manometers, and even a SPY device I have no idea wit it is, perhaps he bypassed the immobiliser himself.

What is the risk? Can it stop the engine from working?

Thanks.