Question about GMC Sierra 1500
Posted by Anonymous on
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Posted on Jan 02, 2017
The high pressure and low pressure hoses are different sizes at the gear box. And the low pressure /return hose is usually rubber with a clamp at the back off the pump.
Posted on Mar 03, 2009
neto 190D: You are asking about a vacuum diaphragm?
I'm going to take a WAG.. Your engine won't shut
down with the key?
If so, he is the way you find out:
In your injection pump, the vacuum diaphragm which kills the engine is the one which has the fitting pointing parallel to the ground.
The vacuum line which serves it is a brown/blue
To check the system, first check for vacuum in the line. Run the engine for a minute or so. Cap off the brown/blue line.
Turn the ignition switch off and then with hose in hand, uncap it and you should hear a hissing sound. If you have a vacuum guage, obviously, use it for the test, you need a minimum of 10 inches to kill it.
To test the pump diaphragm, you can rig a vacuum line to a known vacuum source close to the main "T". Run the engine and with the line connected to the diaphragm, connect it to the good vacuum source, if it kill the engine, the diaphragm is good. If you have a hand vacuum pump it would be more ideal, because you could check the diaphragm for small leaks.
If the diaphragm is bad, it is easy to replace on the pump.
The shutoff diaphragm lists for $86.00
Is my shot in the dark correct?
Even though I am a Nissan Master tech, I also specialize in Mercedes-Benz and specifically Diesels, so if you need help, I'm here. I went through a few Mercedes Schools and have been swinging Iron in Mercedes since the 70's
I might be a little more informative than the public library.
Posted on Apr 24, 2009
SOURCE: Need vacuum diagram
I can't send you a diagram but I can tell you the basics that should get you mobile. Take a vacuum line from the lower front of your carb and hook it to your distributer vacuum advance. Take another from the front of your carb and run it to your EGR valve. It should be beside the carb on the intake manifold. At the rear of your carburator there is a large line coming out. It should be steel. It provides vacuum boost to your power brakes. Hook it up. Make sure all other vacuum outlets on the carb and intake are blocked off and you should be able to get mobile.
Posted on Jun 06, 2009
It is 1-8-4-3-6-5-7-2 with 1-3-5-7 on the drivers side front to back, 2-4-6-8 on the pass side and the dist turns clockwise.
I wish I still had my Chilton's manual, I would scan a picture for you.
If this helps, please rate me.
Posted on Sep 14, 2009
Testimonial: "Just the info I needed, THANKS VERY MUCH."
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