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If you have a vortec their is only one injector. It is located inside the throttle body. Called a spider and available only through dealer. Part retail $300

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Q: How do you check a 94 Blazer S10 fuel injection system?
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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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