Replaced the fuel pump (not the entire assembly) this weekend. The vehicle is hard to start, sometimes having to turn the key on to position 2 a couple times to ensure fuel is primed for ignition. Tested the pressure in the fuel lines after a 15 minute drive, nothing....not even a light hiss. Could my fuel pressure regulator be crap? What else should I check. I've got my voltmeter at the ready!

 

How's your fuel filter? Your injectors could be leaking down, too.

 

Fuel filter was replaced not even 3,000 miles ago. I don't think my injectors are leaking, I can check. There is not a strong fuel smell coming from the engine bay.

 

Fuel pressure test gauge attached to fuel rail test port (passenger side) would be a way to see what is happening. Also be sure that "giant" six inch rubber vac hose is in good shape on the fuel pressure regulator (driver side rear of fuel rails).

 

When I replaced my fuel pump the little hose that is inside the tank that goes from the pump to the outlet blew off and was just spewing fule back into the tank. Needless to say I had no fuel pressure. Yanked it out and replaced with high pressure hose and fuel injection clamps. No problem since. Just a thought, as I did the same thing and just replaced the pump itself. Pretty cheap fix really.

 

Great point!
Toyfare, can you explain what you did with/to the two flexible straw tubes when you replaced the pump? Did you replace them with fuel injection line? And if so did you run the line straight or did you put a loop in it?

 

I just used the original straw tube and use the radiator type clamps to fasten it to the pump. I did test it again after I drove home with the engine running and it shot fuel all over the place. Should the rails still be under pressure after the car has sat over night?

 

Do a leak down test. Buy a gauge to screw onto the Schrader.

 

Ordered a new fuel pressure regulator (on sale $40 from Atlantic British). Thought this would be cheaper than buying a regulator AND a pressure test kit. Will post to see if this fixes my issue.

 

Does the disco have advanced evap?