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On the 4.3 vortec: to check for a leaking system, Remove plastic vortec cover, Then remove the round black thingy on the top and look in with a flashlight. It SHOULD be dry. If it is wet, you got a leak. Could be fuel pressure regulator (passenger side) or fuel line (driver side).

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Q: How do you check the fuel injection on a 94 Chevy Blazer S10?
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