I recently put on a "spare set" of injectors that I sent to Rich at http://www.cruizinperformance.com onto my v6 MPFI. Yeah, I know, it's not quite TPI, but they're close enough! I made sure the rail was depressurized before I started, and as I expected, fuel poured out when I removed the first injector. I replaced the injectors by the book, and wondered about the "empty" rail.

The car ran really bad when I first started it up... it would run for a 1/2 second, then stall. It did that a few times, until I played with the throttle to keep it running- then it was fine.

I thought it might have something to do with air in the fuel rail. The car's running fine now, but is there some provision inside the rail to expel air? I figure even if the rail filled with fluid, air bubbles would still rise to the top.

Anyone have an idea?


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-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards

 

The fuel rail has a feed and a return. Fuel coming in the feed line will push the air out the return line till it empties in the gas tank. Next time you start the engine after swapping the fuel rail, turn the key on for a few seconds a couple times to let the fuel rail pressurize.

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1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

Sweet, thanks Kevin! I went through a brake bleeding nightmare a few months ago; "air trapped in the system" is still in my mind.