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Old 11-01-2010, 01:18 AM   #1 (permalink)
94dually
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testing lift pump on 94 6.5

i got a 94 deisel 3500 i was reading the newbie thing anyways went to check the lift pump operation, the pump on the 94 does not prerun with the glowplogs apparently, so i had the engine running i cracked open the t valve for about 3 seconds fuel poured out of it and the engine did not burp or stutter it never missed a beat..... did i have the valve open long enough? and does this mean my lift pump works?
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Old 11-01-2010, 01:40 AM   #2 (permalink)
racer55
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If you get fuel with the engine running and it does not stall right away I suspect that the LP is working.
A better test would be to hook a fuel presure gauge to the line connected to the tee-valve and check running pressure-that will tell you for certain if there is pressure at that point and how your lift pump is working.
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Last edited by racer55; 11-01-2010 at 01:40 AM.
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Old 11-01-2010, 10:58 AM   #3 (permalink)
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94-95, the lift pump will NEVER pre-run. It is like that from factory. Nothing to worry about. You can mod it such as Kennedy LP/OPS harness will pre-run with key "on".

In this same year, the OPS controls the LP during engine run. So bad OPS can cause LP not to run. This is the part of the OPS which controls the LP not the one to the gauge.
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Old 11-01-2010, 12:36 PM   #4 (permalink)
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In addition, from your description, you have a good running LP and OPS.

Unless you have other symptoms, just enjoy your truck. Worry about it when something is not right.
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Old 11-04-2010, 10:40 PM   #5 (permalink)
94dually
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just for anyone else reading this thread in time...put a gauge on it just to know and found just over 6 psi pressure right off the tee valve FYI
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Old 11-01-2013, 06:02 PM   #6 (permalink)
efren
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what is the ops
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Old 11-01-2013, 06:09 PM   #7 (permalink)
Rattler1
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Quote:
Originally Posted by efren View Post
what is the ops
Oil Pressure Switch/sending unit. It gives the reading on the dash as well as controls the flow of current to the lift pump.

Check through the FAQ's at the top of this forum for a complete list and other helpful info.
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Old 11-01-2013, 06:13 PM   #8 (permalink)
racer55
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Quote:
Originally Posted by efren View Post
what is the ops
From the FAQ:
Acronyms just what are you guys talking about
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Old 11-01-2013, 06:14 PM   #9 (permalink)
efren
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I just replace the lift pump on my 1994 6.5 turbo diesel because it wasn't running when i had the truck running so i replace the pump and still same problem. i also replace the fuel pump relay. Does anyone know what it could bo wrong whit it?
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Old 11-01-2013, 06:55 PM   #10 (permalink)
racer55
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Oil pressure switch is the power supply for the LP when the engine is running.

AC Delco ONLY for replacement OPS.
OPS relay mod is encouraged:
Again from the FAQ-theres good reason it says look here first!
http://www.dieselplace.com/forum/63-...y-install.html
Another version:
http://www.dieselplace.com/forum/63-...ml#post5291633
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