Engine/Transmission (1998.5 - 2002) FASS failing?

[Beach]

I think my pump is failing. 0psi at idle and engine breaks up and misses when driving. With the truck off and I bump the starter, I can hear the pressure build and the guage goes up to around 20psi where it used to be. Can these pumps be rebuilt, or where should I start with this? Thanks!

 

[AWeiman]

start with the easiest if you haven't already and change the fuel filter. When the gauge shows 0psi at idle is the pump not running at all? Could be an electric problem as opposed to failure of the pump.

 

[JCyrbok]

start with the easiest if you haven't already and change the fuel filter. When the gauge shows 0psi at idle is the pump not running at all? Could be an electric problem as opposed to failure of the pump.

maybe need a new relay or fuse in the FASS harness?



J-

 

[1965LONEWOLF]

Just went threw all this , thought it was the pump,took it off and took it all apart ,nothing wrong, it was the pre-filter they make you put on before the fass , small metal filter , changed that and no problems-funny thing is i had changed it about 6 weeks ago , but i chenged it and runs fine

 

[Beach]

UPDATE! I performed the "bucket test" as required by FASS to eliminate the pump as an issue. The truck ran fine with full fuel pressure, " except for me accidentally getting air in the line and having to reprime the injector lines"! That told me it was something in the tank. I pulled the bed off and pulled the sending unit out. I found the screen on the bottom of the sending unit black and full of debis. It seemed to be small black sandy/dirt particles and chunks. Cleaned it thoroughly and went to reinstall, when my buddy noticed that the "black stuff " was actually fromthe pick up arm. The black foam like float was worn on each end from 200,000 miles of rubbing around the tank. Thought I would mention this as I have never seen anyone mention this as being a problem. It was all inside the screen and bottom of the sending unit. So after cleaning that mess, I reinstalled everything and now the truck has 20 psi fuel pressure and runs great. Good luck if you're having similar issues. BTW, I had to drive to my buddy's house to use his shop, so I put a fuel hose in a 5gal fuel tank from the FASS to get there. My tank was full and I never thought about fuel returning into the tank. Basically, I left a fuel trail from my house to his from the fuel tank over filling. :-laf

 

[Sticks]

Yeah, running a truck on an IV line requires the return line going back to the IV. Surprising how much return fuel there is.

 

[AWeiman]

thanks for the update, definetly something i will have to remember.

 

[Bob Cochran]

I have heard of Heavy Duty Trucks Class 8's having the cross over lines split and dumping fuel. They got caught and had to pay environmental cleanup which I have heard cost $5000 and up depending on amount of spill. Of coarse they have in some cases 300 gallons of fuel on board. Not wanting to steal this thread but has anybody heard of the EPA doing this to trucks our size?



By the way glad you found and corrected the problem. Good deal!!!! Oo.

UPDATE! I performed the "bucket test" as required by FASS to eliminate the pump as an issue. The truck ran fine with full fuel pressure, " except for me accidentally getting air in the line and having to reprime the injector lines"! That told me it was something in the tank. I pulled the bed off and pulled the sending unit out. I found the screen on the bottom of the sending unit black and full of debis. It seemed to be small black sandy/dirt particles and chunks. Cleaned it thoroughly and went to reinstall, when my buddy noticed that the "black stuff " was actually fromthe pick up arm. The black foam like float was worn on each end from 200,000 miles of rubbing around the tank. Thought I would mention this as I have never seen anyone mention this as being a problem. It was all inside the screen and bottom of the sending unit. So after cleaning that mess, I reinstalled everything and now the truck has 20 psi fuel pressure and runs great. Good luck if you're having similar issues. BTW, I had to drive to my buddy's house to use his shop, so I put a fuel hose in a 5gal fuel tank from the FASS to get there. My tank was full and I never thought about fuel returning into the tank. Basically, I left a fuel trail from my house to his from the fuel tank over filling. :-laf

 

[Sticks]

I have heard of Heavy Duty Trucks Class 8's having the cross over lines split and dumping fuel. They got caught and had to pay environmental cleanup which I have heard cost $5000 and up depending on amount of spill. Of coarse they have in some cases 300 gallons of fuel on board. Not wanting to steal this thread but has anybody heard of the EPA doing this to trucks our size?.

At least here in CO, only truck that are considered commercial - those that have company logos and DOT numbers (work trucks) would get ported.



I have yet to hear of a privately owned vehicle getting ported unless they were blatantly unsafe (stuff falling out of the bed, towing too heavy and not an RV). Farmers in rural areas occasionally get popped by the portables but they are more interested in dipping the fuel tanks for off road diesel.

 

[Bob Cochran]

Sticks

I don't know where the trucker was at that had the fuel leak could have been in a truck stop, driving down the road pumping out fuel I suppose. The EPA was not happy and charged him for the clean up as I recall.

I am not sure even what state I read it on one of the owner operator sites quite awhile ago. I was just wondering if anyone heard of it happening to us lil guys.

 

[Sticks]

We "Lil' guys" are dealing with only 35-85 gallons. OTR are 150 - 300+. We notice a fuel problem a lot sooner.



If I had to guess, the story you read was, yes, in a truck stop, or rolling into a port. The mood of the DOT inspector and the driver can make a HUGE impact on the outcome. If either one of them is an ***, it will not end well.



I had a truck get flagged "Out of Service" due to a difference in the leaf spring/axle mounts being 2 different styles - still OEM (DOT inspector said they were broke), then he went willy nilly flagging anything even remotely questionable (low windshield washer fluid... Really?!?). Took 1/2 an hour of arguing with the guy, then making him crawl under the truck to look at the mount to see it was a threaded mount, not nut and bolt. Then another 45 minuets going over everything else he flagged against the DOT code book. By the time we were done, I got it down to 1 missing tie down strap.