97 Blazer 4.3 fuel leak at injector connector

88IROC_Z

MEMBER
1997 CHEVROLET TRAILBLAZER

I have a fuel leak on my 97 blazer 4.3 (W) motor. The 12 wire connector that plugs into the top of the injector housing is leaking fuel all over the top of my plenum. The boots on each of the wires are wasted and fuel just leaks right up through the connector. The truck runs fine, but I have noticed a decline in gas mileage. I hav'nt pulled the upper plenum off yet but was wondering if anyone knows what exactly would cause this problem. Could it be Injector seals, fuel pressure regulator, the connector itself, or a combo of them. I also have two bad O2 sensors that need to be replaced will this cause any fuel presure or metering probs?

Monday, March 12th, 2007 AT 9:27 AM

3 Replies

CHEVY22

MECHANIC
1,375 POSTS

The o2 sensor will cause a fule degradation issue, but the injector body leaking really needs to be looked at, the fuel line connector may have a bad seal or like you said anything until you pull it off, the regulator is in the back lower portion on the metering body and would not leak fule as you have indicated, I would pull the connector those bolts dont sound good
Jim

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Monday, March 12th, 2007 AT 11:32 AM

88IROC_Z

MEMBER
2 POSTS

I have pulled the connector itself off of the metering body and cleaned up all the gas that was sitting on top of the metereing body. The gas is not coming from the lines going into the metering body but coming right through the metering body where the top of the injectors are and right up through the connector itself. After cleaning and drying the area I put it back together and ran it for about 10 min. The area where the lines go into the body was dry but gas had filled the connector part of the body and came up through the connector. My local gm parts dealer says that the metering body itself is bad and I have to replace the entire "poppit" style assy with the new "spider" style. Does this sound correct? Spider assy is $300 not counting the $32 bracket and $38 gasket and seal kit. Sounds like alot to fix a leak when the truck is running just fine.?

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Monday, March 12th, 2007 AT 3:28 PM

CHEVY22