My truck ran yesterday, but not today

Yes you did, sorry about the double question. You had told me that either the fuel return line was clogged or the fuel pressure regulator was bad. I used an air hose to blow through the fuel return line and heard a thud come from the fuel tank. I did it a couple of times and heard the noises coming from the tank so I think the line is clear. I also repaced the fuel pressure regulator with a OEM unit. The fuel pressure is now 40psi when I turn the key and the problem still exists. I don't know for sure if the return line is completely unblocked. Is there any way to check? Are there any other causes?

No, the psi stays at 40

For a split second

Here is my first post

Asked on October 13, 2011 1992 GMC Typhoon Engine Problem with 83000 miles

Thanks! You've donated $ 5.00 to this question!

Flag for review

DONATE

Your Donation Helps

Online Car Repair Manuals

GMC Question

Truck Ran Yesterday, But Not Today

My truck ran fine yesterday. It has a fresh tune up, good spark, fuel pressure at 36psi with vacuum hose attatched, and proper timing. I had my truck in storage for 2 years with gas stabilizer and decided to empty the tank and add fresh gas. Now it won't start.

The truck will fire intermittently while trying to start and produces black smoke. The engine is flooding at startup and the spark plugs were a wet black color. I cleaned the spark plugs with acetone and it still runs the same. I noticed that the throttle position sensor was disconnected so I reconnected it and pulled the ecm fuses to clear the code. There was no change. Unfortunately, I cannot get the truck running long enough to set any trouble codes if there is one. Please give me and idea what to check next.

Hi Saturntech, I didn't mean to unplug the TPS, I really don't know how it happened. Unfortunately, that wasn't the problem lol. I reset the computer, but now I can't get my truck to run long enough to throw any other codes. I just sent my injectorswhen out to be cleaned, but when I get them back, I will definitely check the coolant temperature sensor.

Thank you, yes I do. I have my chilton manual that describes the test.

The coolant temp sensor has been replaced, along with the MAP sensor. I should have tested them rather then purchase new ones because it costs alot of money. The problem persists and I keep getting a trouble code 33.

The engine starts but it runs terribly, and with alot of smoke before it will stall out. I have a datamaster cable installed in my truck but I do not have the program in my computer.