['63GENIII]

Update. Ive been messing with it all day, driving it after each change. First ride felt like it was running out of gas. Back in the driveway, take the car and a gas can to remedy this (gas gauge isn't working yet). Got 10 gallons in it and took it for a ride. Still died at stops, idle is still hunting around but not as bad as before.

I tested TPS ground, input and output voltage. All good there.

I then pulled the IAC, cleaned it with throttle body cleaner. Re installed and ran it. No change there. Still feels as though its running out of fuel.

I then read the voltage going to the fuel pump while running. I had it connected to a Batt terminal in the fuse box - 12.5v. I figured that might be something so I connected the fuel relay directly to the battery (fused of course) and read 13.6. I figured that must be it right? Well the test drive proved that wrong as well. I drove it down to Oreillys to borrow their fuel pressure gauge again. They've been pretty cool about helping me out. I think they want to see this thing run as much as I do! Well, the results of the FP test yielded 52# with key on engine off. Barely 48# with engine running. When I shut it off, the pump comes on again, get 52# and stays there for eternity. I keep reading that these engines need anywhere from 55 - 60 or so # all the time. Can anyone confirm this? Im really thinking that this may be the root of the issues Im noticing.

Im really wondering if I got a bunk fuel pump? I got the EP381 from Summit and swapped it into my Blazer tank sending unit. When I pinched the return line, it hit 90#. Does this sound right? I don't see any leaks anywhere.

Ive also changed the IAC and fuel filter. No change in the way it runs with either.

The idle is a little rough, acts like its running out of fuel leaving a stop (have to feather the throttle) but goes great once it gets rolling. Under 1000 rpm is where Im having issues.


Kind of at a loss right now. Any suggestions would help.

Thanks,
Chris