I have a lowered 1995 four door blazer that had bad fuel in it a couple of days ago and was sputtering and stalling, but all of the fuel was removed and it has a new fuel pump and filter put on it. It was running fine and driving fine after it got the new filter and pump on it, but it bottomed out the other night and now won't start without quick start being sprayed in the intake. It will run idle for maybe a minute then die, and also it will cut off if you try to give it gas. My dad and I checked the fuel pump and the filter again and they were good. We also checked the fuel pressure regulator to see if fuel was there, but I am not sure if it is good or bad because it sprayed fuel out when we checked it before the truck was running, but after it ran and cut off hardly anything came out. Can someone please help me?

 

As with every suspected fuel issue with these trucks, you must test the fuel pressure & leak down with a gauge. Your engine (CPI like the SCFI/MFI engines mentioned in the tech article) requires 55+psi to start & run properly and the pressure must not drop more than 5psi for 10 minutes after the pump shuts off.

You could also check for proper power & ground to the pump when the problem occurs. Did you have to splice in a new connector when you replaced the pump? What brand of pump did you use?

 

Thanks. I will check the pressure. It has an Airtex pump and it didn't have to be spliced.

 

check to see if all hoses on intake are connected had same problem carried a small amount of gas and small funnel to start it discovered some hoses on back of intake were disconnected reconnected haven 't had any problem since also never let fuel get too low hope thios helps

 

Thanks. I will check all the hoses.

 

I've heard nothing but bad about Airtex pumps... That might be your problem. I don't have first hand experience with them tho so I might be wrong.

 

Thanks chevyblazerchick. I thought those were the pumps that came from the factory with the blazer I have, but I am going to drop the tank and buy a new one today.

 

Airtex is NOT factory. AC Delco or Delphi pumps were used by GM and should be the only pumps considered for the CPI/SCFI/MFI equiped trucks.

Have you run the fuel pressure & leak down tests yet?

 

No, not yet. I will do it today.