Fuel Pressure Gauge Install Question - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 12 (permalink) Old 02-09-2009, 05:00 AM Thread Starter
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Fuel Pressure Gauge Install Question

My Brother and I were installing a fuel pressure Gauge in my 01 earlier today, and are having a problem getting it to register fuel pressure on the gauge. It is a Mechanical Gauge. When we first started the engine up after the gauge was set up, the gauge showed a fuel pressure of apprx 5-10. when we took the truck out for a quick test drive, the gauge stopped working. We've bled both the line running from the isolator valve to the banjo bolt on the bottom of the fuel filter, and the line running from the isolator valve to the gauge in the cab. We When the engine is running we were getting a tiny trickle of Antifreeze (which is what we used in the line from the valve to the gauge) out of the end of the line.
Just looking for some ideas on what possible causes might be, Or if there are any how too guides on installing the mechanical gauge.

~Daniel
01 Dodge 3500 5.9 Sport Dually, smarty, LUK clutch, NV4500, bilstein shocks, 285 toyo ATs, 5" straight pipe exhaust, Silencer ring...missing
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post #2 of 12 (permalink) Old 02-09-2009, 02:07 PM
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First off, I"m not so sure it's a good idea to be running your fuel pressure gauge off of the bottom of the fuel filter. The Ideal place to hook up your pressure gauge is off of the Injection pump With a special banjo bolt. Here is the one that Diesel Manor sells:
http://dieselmanor.com/dm_products/DM-DBBLT.asp

If you don't want to buy that, I'd at least put it on the top of the filter housing in the test port on the injection pump side. Putting it on the bottom could get it clogged with dirt.
Just my $.02

2004 Silverado 2500 LLY Duramax
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post #3 of 12 (permalink) Old 02-09-2009, 03:03 PM Thread Starter
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Quote:
Originally Posted by cowboytw13 View Post
First off, I"m not so sure it's a good idea to be running your fuel pressure gauge off of the bottom of the fuel filter. The Ideal place to hook up your pressure gauge is off of the Injection pump With a special banjo bolt. Here is the one that Diesel Manor sells:
http://dieselmanor.com/dm_products/DM-DBBLT.asp

If you don't want to buy that, I'd at least put it on the top of the filter housing in the test port on the injection pump side. Putting it on the bottom could get it clogged with dirt.
Just my $.02
The install directions we used were from the diesel manor and showed the banjo bolt getting plugged into the bottom of fuel filter. It was for an electrical gauge so im wondering if its different with a mechanical gauge.

~Daniel
01 Dodge 3500 5.9 Sport Dually, smarty, LUK clutch, NV4500, bilstein shocks, 285 toyo ATs, 5" straight pipe exhaust, Silencer ring...missing
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post #4 of 12 (permalink) Old 02-09-2009, 04:50 PM
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I'm assuming that your running the Autometer gauges, just a guess. When I installed mine (ISSPRO), they told me to hook into the injection pump, but I installed an Airdog 100 Fuel pump, and just hooked into the new line that I ran. I would try either hooking into the injection pump, or the test ports on the top of the fuel filter. If it still doesn't work, your sending unit might be shot. Also, where is the sending unit mounted? Sometimes engine vibration can hurt them.

2004 Silverado 2500 LLY Duramax
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post #5 of 12 (permalink) Old 02-09-2009, 05:18 PM Thread Starter
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Quote:
Originally Posted by cowboytw13 View Post
I'm assuming that your running the Autometer gauges, just a guess. When I installed mine (ISSPRO), they told me to hook into the injection pump, but I installed an Airdog 100 Fuel pump, and just hooked into the new line that I ran. I would try either hooking into the injection pump, or the test ports on the top of the fuel filter. If it still doesn't work, your sending unit might be shot. Also, where is the sending unit mounted? Sometimes engine vibration can hurt them.
I have the Dipricol Optix gauges. We installed the isolator on the driver's side of the truck. I attached a pic of where we put it.
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~Daniel
01 Dodge 3500 5.9 Sport Dually, smarty, LUK clutch, NV4500, bilstein shocks, 285 toyo ATs, 5" straight pipe exhaust, Silencer ring...missing
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post #6 of 12 (permalink) Old 02-09-2009, 08:23 PM
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The most common issue I see is that the isolator piston has bottommed out. Try removing the antifreeze-filled tube (gauge side) from the isolator, then use a small (and NOT sharp) rod to push the diaphragm/piston fully to the other end of travel, then fill that side of the isolator with as much antifreeze as you can get in there, then reassemble the tube. Up at the gauge, remove the tube and fill the remaining tube volume with antifreeze (it helps to have a syringe for this part), then reinstall.

Regards,
Michael Pliska

ISSPRO Engineering Manager

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post #7 of 12 (permalink) Old 02-09-2009, 11:21 PM
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I also installed the isolator on my truck. I am constantly having to redo the isolator like mentioned above. Undo gauge side and push the piston back down and refill the isolator. it usually last about 2 weeks and then have to redo. Live Oak another poster here mentioned once that he thought it had to do with the outdoor temp ranges. Mine here range from 70 one day to 20 the next. I am hooked into the schraeder valve on the IJ pump. I am going to change mine over soon to directly into fuel line and get rid of isolator like mopar does.
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post #8 of 12 (permalink) Old 02-09-2009, 11:32 PM
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Personally I skipped the isolator and used a needle valve. But thats' just me...

Michael Nelson - 2002 Dodge Cummins & 1996 Dodge Ram 5.9L Gasser
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post #9 of 12 (permalink) Old 02-10-2009, 12:35 AM
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If you saw a trickle of antifreeze, then you have a leaky joint. I had all kinds of problems with the tubing/fittings leaking on mine. I changed the fittings and tubing multiple times. I finally used grease gun hose on mine and it is holding pretty well.

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post #10 of 12 (permalink) Old 02-14-2009, 07:18 PM
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Quote:
Originally Posted by Badoes View Post
I have the Dipricol Optix gauges. We installed the isolator on the driver's side of the truck. I attached a pic of where we put it.
I see air bubbles in the top line.

Russ
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