90q20v won't start

[Huw Powell]

>  > The pump hums but I don't get anything but a slow drip even
>  > when I hot wire the pump right from the battery to terminal 52.
>  > I loosened the supply line to the pump and fuel gushed out.
> 
> "to" the pump?  Isn't the pump internal?

no, it is external like the 4k is... looks like this:

http://www.humanspeakers.com/audi/fueltray-90.htm

and

> 80/90 cars are gravity fed pumps, no prepumps like in the Mk2 Vw world.

 From what you have done so far, it sure sounds like your pump is not a 
pump anymore.

One last thing, which it sounds like you have pretty much tried by 
cracking the filter connections, is to open a line right after the pump 
(carefully!  as all this work should be done - outside, etc.) and see if 
fuel comes out when powering the pump.

If you absolutely must do this indoors, do it with all doors open and 
some positive ventilation.  Fuel fumes are heavier than air and will 
accumulate near the floor - to the point where a spark could get you 
some of that ignition you've been missing out on, but in the wrong place.

-- 
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/