I just got this '96 Discovery 5-speed with 166K and I starting to work on the bugs. It's hard to start when warm, as in, I crank a few seconds, stop, crank again, stop, and crank again and usually it starts the third time. I hooked up a fuel pressure gauge and noted the pressure at idle was 30 psi. but when I shut the engine off the pressure dropped to 0 within 10 seconds. Thats the problem. What should I check as the cause? I replaced the filter and I don't think it's leaking injectors.[/align]

 

sounds like a leaky injector to me... I think if you pull the plugs and lookfor a dark one, it will show you which one is leaking. Unless there is fuel leaking out of the line somewhere....

just my thoughts.

Jason

 

could also be the check valve in the fuel pump.(supposed to stop fuel from draining back into the tank.) or a fuel pressure regulator.

 

There is no smoke on startup so it can't be leaking injectors.Can the fuel pump check valve be replaced by itself?

 

I would also say it is the fuel pressure check valve and if that is the case, you will have to replace the pump.
Mike

 

Just installed a new fuel pump. Now after turning the engine off I still have over 25psi fuel pressure 30 minutes later. Problem solved.

 

How did you check fuel pressure? Sorry having somewhat similar issue..

 

Might not get a reply from the original poster. It's a 9 year old post and the guy hasn't posted since 2014.

 

Lol yeah i saw that right after i sent reply.. ��

 

Somebody might chime in. I can't recall where to tap in to get fuel pressure.