So I have just been given an '85 S3 Sovereign (XJ6) and its a dual fuel setup, that ran out of gas and never ran again, after sitting for 3 years I have gotten it.

So i started fault finding and discovered the fuel pump was siezed, adding power to it did nothing, further inspection revealed this to be from the RHS fuel tank being full of rust scale, probably partly because the inner spring return flap was stuck open, the LHS tank still appears clean.

So i drained both tanks of fuel, RHS being terrible, and have disconnected the RHS tank from the feed line and just ran a line from the LHS only to the new fuel pump.

After checking over everything else, fluid levels, oil in spark plug holes etc etc I cranked it over and with some throttle it fired up, having a broken engine mount and a faulty air injection setup, and a gas mixer infront of the AFM, it didnt idle smoothly, and just stalled without throttle application.

However the first issue i have is that the return from the motor appears to be filling the RHS tank and thats just coming out the drain hole.

Is there an easy way to plumb the return line into the LHS tank?

I'll be continuing with searching the forum to yield more results (already been very helpful)

As for removing the air injection setup, was are the thread sizes on the head so i can directly plug them, to eliminate that whole setup of air leaks, vacuum issues.

One thing at a time.

I'm not too fussed about this car, as the rust is pretty bad, but i would like it to run and drive so i can check the condition and use the driveline for one of my MK2 Jags i plan on restoring (i have 3)

 

Just 1) plug-off the return line to the RHS tank and 2) make sure the return valve to the LHS tank is open


Cheers
DD

 

Where is the location of the retun valve?

I'm assuming its seperate to the feed valve in the spare wheel well

I'll crawl around and have a look

 

Finally found them, but access is limited, someone has sprayed more bedliner/underbody deadener in all the wheel arches, straight over all the covers/guards.

I'll dig around there tomorrow arvo and try remove the covers.

What process do i have to do to make sure the return valve is open?

 

With the engine running open the LH gas cap and look into the tank. If the left tank is selected, and the left return valve is open, you'll actually see a small stream of gasoline flowing back into the tank. If the return valve is closed then, obviously, you won't.

Cheers
DD

 

Awesome, thanks for your wealth of knowledge. Pulled covers after a lot of hassle, i'll plug the rhs return, but i think just to be safe, i'll look at bypassing the LHS valve.


Any idea of a 1/2" pre pump inline fuel filter, would save the hassle of a dead pump in the future, even though it was only $55 new

 

Sytec Motorsport Fuel Injection Pump PRE Filter Choice OF 8mm 12mm 15mm 6 8 HN | eBay

Something like this, but serviceable would be better

 

Can you get Wix brand filters down under? Google 'Wix 33299'. That's what a lot of us use but it isn't a serviceable type, obviously


Cheers
DD

 

Thats better than anything I could find, cant get them here except for intl shipping via amazon.

Thanks again