Rebuilt Disco wont start

[muddydigger]

I finished my work on the heads, as per previous post. Every thing is back in. Went to start after finishing work onit. Fuel pupmp pumped for a second then stopped. car turned over normal but no start

Checked fuel tank dry as a bone . Put 20 liters in and still no start.

Plugs are sparting well . checked fuel pump fuse and was ok , but the pump wasnt getting power with the ignition on.

Im yhinking maybe a relay, if so where is the fuel pump relay?

does the fuel system need bleeding on a 97 disco v8 3.9?

Any other ideas to check befoe I burn it

[nottie]

You havent burnt out the fuel pump have you?

[muddydigger]

You havent burnt out the fuel pump have you?

I cant tell, there is power at the fuse under the bonet, but none at the pump conection its self.

[chimpboy]

Does it fire at all? Because the 10 second or so running of the fuel pump should provide enough fuel for it to stutter a bit, but not run.

Either way I would try hotwiring the fuel pump so that it is permanently running, and see if it starts that way. This is harmless for testing purposes but it will at least eliminate fuel pump power as the cause of the problem.

I have had this problem with mine.

[chimpboy]

Plugs are sparting well . checked fuel pump fuse and was ok , but the pump wasnt getting power with the ignition on.

On yours I think the fuel pump should only be getting power during when you first turn the key, during cranking, and when the engine is actually running. Just leaving the ignition with the engine not running is not a condition where the fuel pump normally gets power. A safety feature.

However you can safely run it continously for testing.

[Utemad]

I just went through this with a dead fuel pump.

When you turn the ignition on the pump should run for a few seconds. I think the book says 15secs but I don't think it is this long.
The pump will run continuously with the engine running while bleeding excess pressure with the vacuum operated fuel pressure regulator on the back of the plenum chamber.

If the pump doesn't run at all first check the fuse.

If fuse is okay press the inertia fuel cut off button. This is behind the washer bottle on the fire wall.

If it still won't start check the pump relay. This is behind the driver's kick trim. This relay has a blue base.

If the relay is not triggering then remove it and short the appropriate terminals to see if the pump will run (with ignition on).

If it still doesn't run then pull the carpet up in the cargo area and remove your fuel pump.

None of this takes long to do.

If it is the fuel pump then do a search on AULRO as I just replaced mine with a generic Bosch pump for about $106.

[Utemad]

Just another note.

When my pump died it first looked like a relay fault as when I pulled the relay and shorted the terminals the pump ran. This got me home and worked for a couple of days. Then when at work this trick stopped working and I discovered the pump was dead.

I'm thinking that it was just coincidence that what I did 'fixed' it to begin with. Perhaps the wire transmitted more current than an old relay.

What killed the pump was worn out brushes. One was completely gone!

Also just to correct myself above.
If you short the relay terminals out, the pump will run continuously without the key. So you need to remove the short when you park your car.

[muddydigger]

problum found the fuel pumps buggered
I pulled it out and ran wires direct to terminals and no good , Fark more stuff to buy.

[RangingRover]

problum found the fuel pumps buggered cussing
I pulled it out and ran wires direct to terminals and no good , Fark more stuff to buy.

Of course you would have had it immersed in fuel while doing this..... Don't ever run a fuel pump in open air, they can explode and send shrapnel everywhere. If they are an external type, make sure they have at least a fuel supply to the inlet.

[muddydigger]

problum found the fuel pumps buggered cussing
I pulled it out and ran wires direct to terminals and no good , Fark more stuff to buy.

Of course you would have had it immersed in fuel while doing this..... Don't ever run a fuel pump in open air, they can explode and send shrapnel everywhere. If they are an external type, make sure they have at least a fuel supply to the inlet.

Yep i know to run it in fuel and yes it was, but its still farked, need to buy a new one.

[Utemad]

Yep i know to run it in fuel and yes it was, but its still farked, need to buy a new one.

If you need to get it going cheap then apparently you can pull the top of the pump off and file down some new brushes to suit.
However I couldn't get the top off mine without breaking it.

A Bosch F000TE1772 will fit inside your carrier.

[cloughy]

problum found the fuel pumps buggered cussing
I pulled it out and ran wires direct to terminals and no good , Fark more stuff to buy.

Of course you would have had it immersed in fuel while doing this..... Don't ever run a fuel pump in open air, they can explode and send shrapnel everywhere. If they are an external type, make sure they have at least a fuel supply to the inlet.

So all those fuel pumps I've tested over the last 7 years could have blown up and sent shrapnel into my face

[RangingRover]

So all those fuel pumps I've tested over the last 7 years could have blown up and sent shrapnel into my face

Fairly sombering thought, isn't it.... As you've proved, the actual chances are pretty slim, but I still much prefer caution to exploding metal objects at close proximity.

I think its something to do with if the armature sparks - ie. if its immersed in fuel, it can't actually ignite, as there is no oxygen, but if the pump is dry the remaining vapour can ignite.