intank fuel pump

[atco]

good result today i managed to get the 740 going today.i put a 12v battery connected by two wires on to the fuel pump and presto the car started up but some what idling very badly and a very strong smell of bad fuel so do i put the meths in the tank or shall i drain the tank.also the car won,t start without being connected to the 12v battery. the fuel pump wont work on the key although the pump is working.so i think there is a couple of things going on with this car bad fuel that stinks really bad which is causing the idle problem.if i can stable the engine by way of a feeder tank with fresh fuel then cure the problem then find out why the cars not starting on the key.when i crank the engine on the key the pump dont work

[Clan]

Originally Posted by atco

good result today i managed to get the 740 going today.i put a 12v battery connected by two wires on to the fuel pump and presto the car started up but some what idling very badly and a very strong smell of bad fuel so do i put the meths in the tank or shall i drain the tank.also the car won,t start without being connected to the 12v battery. the fuel pump wont work on the key although the pump is working.so i think there is a couple of things going on with this car bad fuel that stinks really bad which is causing the idle problem.if i can stable the engine by way of a feeder tank with fresh fuel then cure the problem then find out why the cars not starting on the key.when i crank the engine on the key the pump dont work

The only reason for that is either the fuel pump relay is faulty or the ignition system is not providing sparks , The coil pulses which produce the spark also keep the fuel pump relay closed . As you had a few back fires before it stopped i suspect the sparks department .

[Laird Scooby]

Add the meths to the tank, if the fuel is contaminated with water as i suspect it is, it will combine with the water and fuel to form an emuslion which the engine can burn - at the moment it keeps getting a slug of water every so often.

You're obviously geting a spark because otherwise it wouldn't have run, it's possible the engine is running too slowly to keep the fuel pump relay energised. You could also try swapping the good battery you used to feed the pump with the battery on the car. It's not unknown for a battery to go duff yet still spin the engine over happily while not providing enough power for the igniton as well.

[atco]

just to say it was only a small motorbike battery to feed the fuel from the pump to the engine but worked great .im still waiting for delivery on the meths but as soon as i get it ill put it in the tank as you suggested.ive just put a new relay on the car but dont think its that you also might be right about the relay as it dont click on the turning the ignition.ive also checked the fuse number one and pump relay and there ok.and i will change the battery over tomorow and put a different one on so im slowly getting it together.so if i feed fresh fuel directly into the engine i wont no if the relay is being energised and also makes sense about the moisture in the fuel coursing the engine to idle badly also backfired again today on starting up while it was trying to start.

[mocambique-amazone]

Originally Posted by atco

good result today i managed to get the 740 going today.i put a 12v battery connected by two wires on to the fuel pump and presto the car started up but some what idling very badly and a very strong smell of bad fuel so do i put the meths in the tank or shall i drain the tank.also the car won,t start without being connected to the 12v battery. the fuel pump wont work on the key although the pump is working.so i think there is a couple of things going on with this car bad fuel that stinks really bad which is causing the idle problem.if i can stable the engine by way of a feeder tank with fresh fuel then cure the problem then find out why the cars not starting on the key.when i crank the engine on the key the pump dont work

First time you did listen and did follow some (of my) instructions
Clapp Clapp

Next step : drain the fuel and don't try to use it. The k-jetronic is very sensitive to bad fuel and will be irreparable destroyed.

Don't even try to feed the engine direcalypso with fuel for this reason.
You will destroy the fuel distributor with your talent.

Next step: post the colour and number of the relay you did swap.

And: the the tacho jump at idle?

Don't try anything else till you got more instructions.

Tomorrow I will be on the road full day. I'm curious what will be destroyed tomorrow because you won't follow again.

Good night, Kay

[Laird Scooby]

It'll do all that if it's on gash fuel. Get a decent, fully charged battery under the bonnet, should be an 027 designation but an 096 or 100 is the upgrade.

Also check all the earths on the battery to engine, battery to bodyshell etc.

[atco]

hi dave do i still continue to put the meths in or as kay is sugesting to drain the swomp and do it that way .also what is a tacho jump

[aardvarkash10]

I'd do both. K-jet are HIGHLY susceptible to problems with water in fuel as well as poor quality fuel. Belts and braces.

Tacho jump refers to the needle on the rev counter if it is fitted. Not sure if yours has one. Sudden movements of the needle that don't directly relate to engine speed indicate an ignition fault.

[Laird Scooby]

Drain as much of the suspect fuel as you can - won't be easy without removing the tank though.
If you can't get the tank and/or the dodgy fuel out, add the 4L of meths in one go.

If you can get the dodgy fuel out, put a maximum of 4 gallons (18L) of fresh fuel in from a clean can and a known good filling station and add 2L of meths. This will give a total contents of 20L, out of which, 2L will be meths. Simple maths shows :

2/20 = 10% which is the ideal concentration of meths to petrol for effective dewaterising.

Chances are the fixing bolts for the tank will be rusted so you may not be able to get the tank and therefore the fuel out of it.

[Laird Scooby]

Originally Posted by aardvarkash10

I'd do both. K-jet are HIGHLY susceptible to problems with water in fuel as well as poor quality fuel. Belts and braces.

Tacho jump refers to the needle on the rev counter if it is fitted. Not sure if yours has one. Sudden movements of the needle that don't directly relate to engine speed indicate an ignition fault.

As far as i know Ash, all UK 7xx had tachos.

Have to say thogh, i always thought "taco jump" was a tasty south American snack made with Mexican Jumping Beans!