Went to lunch few minutes ago, and while in the drive thru, I notice I have 0 psi on FP gauge. soon as I get out onto road, it starts surging, won't go over 1200 rpm. So I pull over to shoulder, and start to get out to take a look, and FP comes back to normal, and truck is agian running fine. No Check Engine light. So... I am thinking I gotta elec. short or bad connection, which is easy enough to diag. However, since it appears my truck will not run w/out pressurized fuel supply to VP, I am going to get either FASS or RASP . I have read up on the RASP, and feel comfortable w/it, but I don't know anything about the FASS(how it works). Does the FASS use the stock fuel system as a backup?

 

Can't believe nobody has an opinion or personal experience.

Neway, I checked voltage at Holley connection, 11.75 volts constant, 12psi @ idle w/electric and mech FP gauge hooked in same prefilter location. Disconnected Holley, and cleaned contacts w/contac cleaner, hooked it back up, and retested voltage. Same voltage(exatly 11.75 volts), but 13psi @ idle.

So, It's time for a new lift pump. I am leaning toward a stock Carter from Cummins, and a RASP.

Thanks

 

I just got an Air Dog which is manufactored by preporator. Here is a link to their website: http://www.ekstamworldwide.com/lighttruck.htm
Its just another option for you to consider.

Doug

 

I think the 0psi issue is due to shutting off engine, but not turning key all the way off, then starting truck again. I did this at the drive thru, and at home after posting last nights update. I have not seen this issue when turning key all the way off. Not sure why this would happen, but it corrects itself after a minute or so.
Neway, the Holley is slowly dying, I have noticed that average psi has gone down about 1-2psi since June, and I know it will not last as long as mech. pump

Jetpilot
Does the Air Dog use an electric fuel pump? If so, isn't it subject to the same failures of any electric fuel pump? Did not find any info on the website stateing whether it's electric or mech.

Thanks

 

gamiller31, The RASP is the only mechanical fuel pump that I've heard of. The FASS is an electrical pump which is mounted on the frame next to the driver's side rear tire, and replaces the entire stock fuel system (tank outlet to the VP44). It has it's own water separator and filter. At the time I bought my FASS, I felt it was the best option -- no, I'm not trying to start another heated debate.

Right now my FP guage will read 0 psi when I first start the truck, but will come up to 13 psi after it runs for a few seconds -- I have a problem with the pick-up tube allowing air to get into the fuel line when the fuel level is below 3/4 tank. When I have a full tank, I don't get the air in the line and the FP guage works like it should. There have been other members commenting about similar problems -- may be worth monitoring how the FP reads in relation to the amount of fuel in the tank.

FWIW -- Franklin

 

On my truck, fp readings are the same regardless of amount of fuel in tank. Truck is daily driver(120 miles per day), so I fill up atelast once a week, and see no immediate difference going from less than 1/4 to full.

Is the FASS fuel pump something that can be replaced easily and w/an over the counter pump if it were to go out a long way from home?

 

If you are looking for an over-the-counter replaceable pump, the recommended solution is the Holley Blue (based on all the threads I've read on this site). It should bolt in and replace the factory lift pump (I've never tried this so I don't have first-hand knowledge).

The FASS pump is not an over-the-counter unit, but is one that can be rebuilt if needed (replaceable bushings) -- I can't find the exact numbers, but based on what I've read, the FASS pump should last several decades for me (I drive about 25k miles per year). The fuel filter and water separator are available through several suppliers (comes with a cross reference table). It’s been around long enough that I’m not worried about it breaking down on me or the company going out of business. As with all products, there have been failures reported (it has a 2-year warranty). I've read more positive reports than negative. If you do a search on FASS you will find more info than most of us can read in one sitting...
Franklin

 

I never knew dodge actually acknowledged the problem... just heard all the complaints on here...


http://dodgeram.info/tsb/recalls/Notice878.htm


Tony

 

I currently use the Airdog, and it is an electrical motor. You can use your current setup as a backup but only after some modifications (changing the plumbing at the tank and the VP44 as well as reconnecting the electrical harness). Although it is another electrical pump, it seems very well built and I don't think I'll have any problems anytime soon.
Mishkaya

 

Hi Mishakaya,

Are you useing your original fuel system as a backup or are where you just making a general statement?

gamiller31,
When it comes to fuel supply and reliability mechanical is the only way to go. IMHO Whether you go with the RASP or the old Cummins cam driven pump conversion they both will outlast any electric pump.

 

Opie:
I left all the original plumbing in place in order to be able to use the lift pump as a backup in case of failure. I have the banjo fitting and gasket necessary for the hookup in the glove compartment. In case of failure I figure it woul take me about 1/2 hr or less to return to the original setup.
Mishkaya
PS
The rasp sounds good and I might still go that route at some point once I am confident about the functionality of the system.

 

Right on, having another way to supply fuel incase of any problems is a smart way to go.

 

I like my FASS. 15 psi idle, 15 psi WOT.

 

I agree that the mech FP is the best FP for reliablilty. I am wondering though, if the electric fuel pump the FASS and Air Dog are using is so good, why can't I(we) purchase this pump, and use it just like the stock or Holleys?

 

My feelings are that you need to do more than just replace your pump. FASS, Airdog, and Rasp, are all capable of moving more fuel that the stock tank module is capable of delivering. Problems can occur. I have the FASS and a custom built tank module. Picture is of unfinished unit as I am still waiting for sender and was not finished plumbing in this pic. Also keep in mind that the stock module is a bucket in which hot return fuel is ddumped. This is a no no in the diesel world. Why would DC do this. Compare the DC module to any other Diesel setup you have ever seen. I am convinced this is the main source of our trouble.
Off Soapbox for now.
Custom module uses Capacitance type probe to measure fuel level (no moving parts)