Engine/Transmission (1998.5 - 2002) fass problem!!!!!!please read!!!!!!!!

[Sick Boy]

heres the problem, i have a 34 gal tank an today i ran out of fuel, but when i filled up it only took 30 gal so i still had 4 gal left. the low fuel light never came on . is their something w/ the fass that does not allow it to utilize all 34 gals?this has happened 3 or 4 times now. before the fass i could get 32 0r 33 gal in her when the feul light came on. things are diff. now why??????????has one onehad this happen ?please advise

 

[steved]

Could be that the tank doesn't hold that much.



It also might be the FASS could be foaming the fuel to the point it won't pump??



Mine will pump right down to nothing...



steved

 

[Rattlin_Ram]

34 gal tank?? MOST I've ever put in mine has been 28 gal. And that was down past E on the gauge... .

 

[Sick Boy]

i thought the 01 quad cab shortbed had a 34 gal. tank. i have put in 30 31 gal quite a few times.

 

[johncameron]

All shorthead models have 129 litres. All longbed models have 134 litres. 2nd gen that is.



JC

 

[Sick Boy]

129 l comes out to 34 gal. those of you w/ the fass how much feul have you had to put in?also have much fuel is sup. to be left in the tank when the fuel light first comes on?

 

[johncameron]

My fuel light comes on with about 35L, 9 gallons left in the tank!!!!! I've neve put more than 105L, 27 gallons in my tank.



John

 

[Sick Boy]

something is not right here ,i only had 4 gal in the tank an light never came but truck shut off. who has run out before an how many gallons did it take to fill up?

 

[johncameron]

It's been like this since day one. I have driven over 1 hour on the highway before tanking up after the light came on. I thought it was strange but it is normal on my truck.

 

[Demons_Ram]

Maybe when the tank is at a very low level the FASS will cavitate or whirpool at the pickup or suck whats available out of the internal tank baffle?



https://www.turbodieselregister.com/forums/showthread.php?t=148908

 

[Sick Boy]

can you tell me about this internal tank baffle?

 

[ecpeters]

Its not a tank baffel but the fuel module in the tank for fuel level and pickup line are metal on the older trucks. There has been a upgraded part that is plastic and will not rust causing the suction line to rust or crack leaving you with less useable fuel. My truck ran dry while ion the 1/8 line I put in 5 gallons and was able to reprime and start the truck I will be changing the tank pickup metering module in the near future. I was warned about 3 or 4 months back by the owner of Extream Diesel here in Jersey when they repaired a bad o ring on my FASS system.

 

[RickL]

If I fill up as soon as the light comes on, it takes about 27 galons. I have driven it way down in to the red ( not a good idea, I'm sure) and never put more than 31 gallons in.



________________________________________________________________________2000 QC SB 2500 4X4

 

[Nate]

I usually fill my truck at 1/4 tank and it's right around 25 gallons.

 

[Camelracer]

Check for an air leak on the inlet side of the Fass. A leak here may not allow it to pull fuel from a low tank.

 

[CGlickert]

MY truck does the same thing since I installed my FASS. I think the FASS is recirculating so much fuel that I cant pump it.



C Glickert

 

[Hahn007]

If I run until I am on empty on the fuel gauge and fill up I can only put in about 27 gallons even though the truck has a 34 gallon tank. I always assumed this was reserve fuel to provide cooling and lubrication for the vp-44 as well as prevent starving it due to running the truck out of fuel. I have never substantiated this it is just an assumption.



Chris

 

[ctdodgeram]

I noticed my 98. 5 would fluctuate the Fuel Pressure guage while at around 1/4 tank and parked (front up) on a steep hill.



My wife had a hard start, (actually didn't start). I allowed it to roll down onto a flat surface, started right up.



Never did know why.