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  #21  
Old 07-31-2013, 02:40 PM
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N2GN2 N2GN2 is offline
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With all this talk about the pre screen I checked mine. I'm glad I did because it was so dirty I don't know how it had been moving oil past the screen. I checked the screen at 550 miles and it was clean, so this has happened in the last 4000+ miles. I cleaned the screen and cap with WD-40 and dried everything with the air compressor. I put anti seize on the threads because the cap was a chore to get off. I wondered why my first CF batch only gave me 800 miles on the filter
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  #22  
Old 07-31-2013, 02:51 PM
AzDave AzDave is offline
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Attach voltmeter or test light to the positive DIESEL fuel pump stud on the fuel pump.

Turn ignition key on.

DO NOT START ENGINE.

The diesel pump should be getting voltage for about 20 seconds with key on engine off. If you can not get under truck in 20 seconds just cycle key again. (turn off then on again to start 20 seconds of fuel pump again.)If no voltage 1st thing to check is the connection at the pressure switch. Install the jumper plug to bypass the switch. If you do not have one you need one. Like this http://www.veggiegarage.com/products...ypass_Plug.php

These used to be included in kits but not the last few years. I put them in kits I sell.

If getting voltage and no pump noise ...flow or pressure then you have a bad pump. Call me I have em in stock.

Also as others said you may have leaking check or purge valves. But usually you will just have low diesel pressure ...not NO diesel pressure if these components are faulty.

Call if you need more help After following these instructions.

Dave and The Veggiegarage Team.
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  #23  
Old 07-31-2013, 04:08 PM
Clay Clay is offline
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I am having a strange pressure issue as well that I can not figure out. Its real sporadic. It operates all across the spectrum. It might be 75 one minute and 65 the next and when I step on the skinny pedal hard it might drop to 55 - but not always. I checked my PV and CV last night and they were not leaking. I cant imagine a clogged screen or filter since its not steadily dropping and staying low. My diesel pressure does the same...

Last edited by Clay; 07-31-2013 at 06:15 PM.
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  #24  
Old 07-31-2013, 05:04 PM
AzDave AzDave is offline
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Try using a mechanical gauge to eliminate the electric gauge as a possible source of your problems. I know you know that most stock pumps will drop pressure some when you step on that skinny pedal. More load means more fuel used. If you do not have a mechanical gauge I can make you one up with an 8 foot hose to reach from the V3 or 4 manifold to the inside of the truck for testing only. Dave
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  #25  
Old 07-31-2013, 06:12 PM
Clay Clay is offline
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No, I dont have one, how much are yours?
I know more peddal means a "slight" drop in pressure. Mine is dropping 25 psi...Thats not normal.
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  #26  
Old 09-19-2013, 04:11 AM
bschm50693 bschm50693 is offline
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I don't know if you've solved your diesel fuel pressure problem or not yet, but I've had the exact same problem with sporadic fuel pressure at various speeds and engine loads. After suspecting that the fuel pump was beginning to fail, I went ahead and replaced it. The problem continued right away. I determined that there was some problem inside the tank, so I drained it and lowered the tank expecting to find 100,000 miles worth of crud inside. It was actually very clean, but the fuel sender and pickup assembly was a different story. Inside the fuel sender is a set of small sock filters. It took me a few minutes to figure out how to take it apart, but once I did, I found those sock filters packed nearly solid with sand, dirt, hair, insect parts, etc... 20 minutes with a good solvent, soap and water, and compressed air, they were good as new, truck ran great and no problem since. A quick way to diagnose this without draining and lowering tank is to remove fuel line from input side of fuel pump and feed some compressed air back into the tank. You may want to remove fuel cap from filler neck so that pressure isn't built into tank and fuel belches back out of fuel line back out you. If after doing this, truck runs normally for a while, then you have your answer and it is at least a cheap fix, just a lot of work.
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  #27  
Old 09-19-2013, 03:05 PM
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N2GN2 N2GN2 is offline
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Is the Donaldson filter life effected by only being used one weekend a month? I have yet to get over 1500 miles on the vegiram filter. Maybe I should try purging the system longer to clear the filter?
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Last edited by N2GN2; 09-19-2013 at 03:11 PM.
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