99 Burb start great then pukes in Minutes

[pflyman]

Got It Stickman, Thanks for getting back. I'll do the pinch off and see if I get the system to hold pressure. I didn't think the pressure should bleed down that fast, unless it was designed to relieve through the return line. If I pinch it there should certainly be a change. I think that will be my last test before I do the open heart surgery, and I'll just change the Distributor cap wires and rotor, and probably the fuel reg. Fuel pump will be done last if the pressure doesn't go to the excepted norms. The old girl is ready for some new parts anyway. Thanks again for the Info. I really love this old truck (tractor) it has done everything from pulling stumps to hauling my fire wood to plowing tons and tons of snow. I might even give her a good bath when this is over. Have a good year.
Dan and Theresa On the mighty Manistee river

[pflyman]

Stickman, This is pretty cool stuff right here. I did the pinch off thing on the return line and instead of my fuel pressure reading 48lbs and bleeding off in 2 seconds, it read the same 48lbs, but took 40 sec. to bleed down. HUM, what the heck does that tell me ( I thought while scratchin" my ass) . OK, I thought about that all night. Next day I decided to crawl over my engine like a ferret in a rat hole and eyeball every thing I could see, and feel with my fingers anything I couldn't see. When I felt the vacuum line running down the fire wall, I felt something funny. When I dug into it, turn out a small chunk of a very brittle vacuum line had a piece broken out of it. Even looked OK on the top of the line but this chunk was about the size of a match head on the bottom. I trimmed it back and used a 3 inch piece of the tube that was on my fuel pressure gauge bleed down. Who'd a thunk it? Idle went back to a normal 600-700 r's and smoothed out. Fuel pressure test running a constant 52lbs. I drove it to town and put 1/2 tank of gas in it and plowed the road and 2 track for 4 hrs never shutting it off. I still have the code o2 sensor # 2-2 low voltage, which I'm replacing today, but other than that, NO other codes like before I repaired the vac line. I'm guessing that that line went to fuel pressure Reg. Doing a full tune up this week. Dis. cap, rotor, wires and call it good. Hope someone can use this down the road. I have a feeling that alot of repair shops are replacing fuel pumps more out of despairation than good diagnostics. Thanks For Hangin in there on AF. I'm sure lots of folks can use your valuable input. You sure helped save my butt alot of money and time. Thanks Again. Have a Good Year!
Dan and Theresa on the mighty "Manistee" river. Livin the dream!