FASS & the 5 gallon bucket test - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 3 (permalink) Old 03-11-2008, 04:23 AM Thread Starter
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Lightbulb FASS & the 5 gallon bucket test

I've read much about folks having problems with their lift pumps and some dissatisfaction with FASS pumps.
I had problems and installed a FASS, but the damage was already done to the VP44. Installed a new IP, but my fuel pressure would still go down under WOT. DieselPerformanceParts.com has, in their instructions on how to do a diagnosis for lift pump problems.
It's the 5 gal bucket test. Basically you take the suction and return line off of the tank. Put them both in a bucket that has diesel. Start the motor and check pressure and flow. My problem was the in-tank filter, at the end of the draw straw, was clogged, thereby reducing flow under demand. The instructions should come with the installation instructions and might be available on their web site. If you are having other problems with the FASS, call Dan @ 1-866-769-3747. He was very easy to work with.
Hope this helps, it would have saved me a couple thousand, had I known.
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post #2 of 3 (permalink) Old 03-12-2008, 08:30 AM
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Hello- I am putting on a FASS right now - the pictures kinda suck and it don't really explain what all the parts are. The pictures are way too close and you have to study a long time to figure out where on the truck you are looking at. Btw - they say don't take off the box - don't listen - it is so much easier if you do (only six bolts and the tailight and bumper wires!) and the top of fuel tank is WAY easier to get to! Also you can then get that power robbing sock off the end of your suction tube. Good luck! JIM
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post #3 of 3 (permalink) Old 03-13-2008, 02:25 AM Thread Starter
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I didn't remove the bed. I just lowered the tank and removed the drive shaft to have room to work. That was my mistake. Had I removed the whole sending unit and pick up straw, I would have found that pesky in-tank sock/filter and removed it. After the FASS and a new VP44, I learned to check everything from start to finish.
Dodge should sell just the in-tank filter, but no, they want to sell you the whole darn thing ($400)
BTW, the pictures I got for installation showed a different truck than mine and I did let Diesel Performance Parts know that they should show pictures that apply to the truck that the FASS is being bought for. Thankfully I had some technical assistance (over the phone) from a mechanic friend that has installed the FASS on other trucks.
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