My 89 won't run

my 89 Ramcharger (with T.B.I.) starts, runs for a few seconds then stops. I have replaced the the; the TPS, MAP sensor, Fuel pressure regulator and checked for vacum leaks at the TBI. full throttle will keep it running for about a minute then fuel stops. I am LOST

Check your fuel pressure when it stops (leaving the ignition ON after it stops) and see if it's still what it should be. You may have something in the filter or tank that's clogging up.

As a second thought, how old is your exhaust? The catalytic converter(s) could be clogging and causing the problem; there have been several posts about that problem in here and it's pretty common. 2k

The Cat is new, 4 months, and fuel pressur is at least 12 and stays there, my gauge only goes to 12 psi

Hmm...odd. Well, is the engine in a good state of tune? Plugs/cap/rotor/wires? I figure it is but had to ask.

Also, how many miles, what engine and has the timing chain ever been replaced?

Is the throttle body injecting/atomizing the fuel?

Engine miles, not sure. it was an old CDF truck form mountian area and the fuel is atomizing

I have to say I'm stumped also. You've got fuel, air and spark since it runs. And it just quits after a minute.

When it runs, does it run rough or smoothly?

It runs rich

It may be a long shot, but I have had a few cars that the oil pressure sending unit got cracked, and it would shut fuel down as soon as you let off of the ignition. Most Cars have this as a safty? Does your Truck leak oil?

Yeah it started badly not to long ago I'll try that and get back to you

Not the oil sensor, Thank for the idea

try disconnecting your fuel return line and le return fuel go into a container want to eliminate return line
going back to tank if it's plugged your fuel pressure will go too high then injectors cannot open just something to try and cost nothing also before starting disconnect pcm for about 15 minutes

After elimenating everything else, I tried this yesterday and The truck ran. It cost about four bucks worth of parts and the tank is still on the ground this morning after blowing out the lines with a compressor yester day. But the f*#!?^%$@ thing is running Better than before. Clogged return line. After $ 250 at least worth of parts and the running back and forth to Autozone, and MANY days and nights reading and working on the truck. It's running. Thanks everyone for your help

sweet

Cool; good solution 1thunder.