What does a oil pump on a gmc jimmy 2001 vortec gmc engine look like

The engine will match up but the sensor plugs may not so you may have to swap the sensors between the engines.

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1997 GMC Jimmy 4.3 L Vortec - Discussion on Topix

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Aug 17, 2009 - I have a 1994 S10 Blazer with 4.3 Vortec. ... Sometimes runs fine, or it barely moves and won't get out of it's own way all the .... Can rev up, dies. 1994 Silverado 5.7L TBI Engine Missing/Surging/Sputtering ...
Sep 27, 2013
2001 Jimmy transmission not shifting
Jul 5, 2009
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it being plastic it might float and block an oil line id drop the oil pan and get it out its a pain staking process

Bad fuel pressure regulator under the intake manifold
& possibly a fuel pump loosing pressure also

On the vortec engines they require 56 pounds of fuel pressure to start a few pounds shy of that you have a dead vortec you will need a fuel pressure guage to verify

IS THEIR WATER IN THE OIL? CHECK THE PLUGS TO SEE IF THEIR WET.YOU MIGHT PUT SOME PLUGS IN IT IF WET TO SEE IF IT WILL RUN.THEN PUT SOME HEADGASKETS ON IT.BUT IN REALITY NEW MOTOR WOULD BE BEST.

25-30 psi at idle after engine is warm. 45-60 psi going down the road after engine is warm.

just to the right of the base of the distributor. right being facing the engine.

The "spider" injector is the problem. You're right that one of the injectors is stuck open, unfortunately it has to be replaced as an assembly. This a common problem on the Vortec V-6's. When you were checking the fuel pressure, the fuel was passing through the open injector, giving you a low reading. After replacing the injector assembly, be sure to change your oil before you start the engine. I'd be willing to be you have a pint or two of gasoline that has gotten into the crankcase. That injector unit will cost you around $350. It's not too hard to put in, just be careful.

This could be either your fuel injection system or lifter noise. Make sure you use 5W30 or 5W20 oil in the winter. It will get to the top of your engine faster which is the most common cause of wear.

You might try about a half cup of Lucas Oil suppliment. It's great stuff and a little goes a long way to internal protection.