93 S-10 Blazer only starts with manual fuel prime

  • 1993 CHEVROLET S-10
  • 6 CYL
  • 4WD
  • 160,000 MILES
I have a 93' S10 Blazer, it's got the Vortec 4.3L CPI (Center Port Injection). The vehicle started running rough, problem was resolved by replacing the plastic fuel lines inside the intake manifold that feed the "spider". They were cracked and leaking excess fuel into the intake. After that, the truck ran great for about a week. Then we discovered one day, it simply wouldn't start. The fuel pump does it's start cycle, but the engine isn't getting it's initial prime of fuel to start. If we spray carb cleaner or any other combustible liquid into the intake, the truck will fire up and run like a charm. So basically, it's not automatically priming itself to initially start. After manual prime, starts no problems everytime, hot or cold. Could the fuel pump not be pushing it's correct psi, and need to be replaced, or could the "spider" be faulty? I'd like to narrow it down to just one of those problems because I don't have the money to replace both. Some feedback would be awesome, thank you!
Do you
have the same problem?
Sunday, February 24th, 2008 AT 12:47 AM

1 Reply

Some of those trucks had a "pulse dampener" on the fuel pump between the pump and the tank unit, when they start going bad they can cause a long list of different fuel related problems like you describe. The A/C Delco replacement pump comes with a piece of fuel injection hose and 2 clamps to eliminate the dampener.
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Sunday, February 24th, 2008 AT 8:07 AM

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