Question about 1994 GMC Sierra
Possible ruptured diaphragm in fuel pressure regulator on 1994 GMC Sierra.
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Posted on Jan 02, 2017
had this problem on my neighbors 98 chevy truck with the same engine !!
it turnd out too be the fuel pressure regulator,you have too pull the upper intake too replace it!!
Posted on Jun 06, 2009
I have the same problem and have trouble codes 35 and 36. I found out that there is a computer module that needs replaced as it sits low in a valley and gets hot and seperates. I am reseaching about the a/m fix that installs the new module away from heat.
Posted on Mar 12, 2009
It's on your fuel injection rail BELOW the upper intake manifold. The upper intake manifold MUST come off first.
Posted on Aug 01, 2008
SOURCE: Fuel filter location Sierra
I have been told by a mechanic that the fuel filter is inside the fuel tank. Have to either drop the tank or remove the pickup bed. Access is on the top of the tank. This is poor engineering.
Posted on Mar 13, 2009
SOURCE: rough idle,runs fine on highway
It is possible that the regulator is leaking into the intake plenum, or one of the injector lines has a bad O-ring and is doing the same thing. This was actually a big problem with this system on the 4.3L engines, but it is a little different on the 5.7. Before tearing into this this though, I think it would be a good idea to get a professional diagnosis. I would start with a compression test. The miss could be caused by low compression in one or more cylinders. The injector assembly has the regulator mounted right on the side of it and the whole assembly resides inside the intake plenum. It is not that difficult a job, requires some patience and skill, the worst part is the cost of the parts.
I've attached a picture of the injector assembly with the reg attached and highlighted
Posted on Mar 19, 2009
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