Engine/Transmission (1998.5 - 2002) Cannot bleed fuel system

[dcochran]

RASP System

Horsepuller



I am deciding between the two and have no preferences. And what is a RASP system?



__________________



See the following link re: the RASP system. What a gem.



http://www.dieseltrans.com/phpBB/viewtopic.php?t=524

 

[RustyJC]

If you think the lift pump has just lost its prime, you can also reprime it by pressurizing the fuel tank. An air hose and a tennis ball with a hole cut through it work well.



Rusty

 

[Rman]

The RASP is what I've been looking into lately. I found a little out by calling around. It's a mechanical pump driven by the crank pulley. It varies by engine speed and can deliver as much fuel as the engine needs from what it sounds, yet it is dynamic and doesn't over pump at lower rpm levels.



The only reason I'm not terribly thrilled is it's cost. It's a little costly and does not come with a plumbing kit. A part list is provided and for about 200 bucks it can be plumbed with quality parts from Jegs or Summit racing.



From speaking with everyone, it seems as if it's quite a job to install, probably a whole afternoon for someone like me. Right now that's all I know, as more and more folks use this pump I'm thinking it will become "the answer".



KO Engineering makes it, DTT is a distributor, more too come on this I'm sure. Pricing is roughly 640 plus plumbing. So if you're paying someone to do this for you, I'd say around 1k would be a good ball park.



That's a big chunk of change for fuel delivery, but look at how much everything else is, ust another piece of the pie.

 

[lsenus]

Has anyone tried one of the pumps from AeroMotive?

http://216.242.145.16/products/product.phtml?p=44

 

[Steve St.Laurent]

Yes, AeroMotive pumps have been tried by a number of people. Click on search at the top of the screen and type in aeromotive and you will get 77 threads back.

 

[willyslover]

Leo. . look up Chris Sutton name and posts about the Aeromotive,

he has had one on for well over 2 years without any problems. . [he did have a plugged filter on it once, but cleaned and good to go

 

[CEkstam]

The statement was made that the fass and the AirDog were the same. I would like to point out that the fass is a copy of the earlier Fuel Preporator with the primary gas exit port removed. This limits the air removal to certain operating conditions and can have very detrimental effects to the injector pump and injector nozzles when used over a long period of time. The AirDog is a very advanced design of the Fuel Preporator product line designed especially for diesel pickups. It is manufactured under ISO-9001 quality control and approved for sale and use in California by CARB. The AirDog Fuel Preporator is protected under three United States patents issued and PCT filings covering 117 countries. (The makers of the fass are answering to the Federal Court System for patent infringement. )



The AirDog is just now being shipped and has not been on the market long. As more of the AirDogs are shipped and consumer feed back hits the TDR threads, I think that all will see very quickly the difference between real engineering and a quality product vs. things that end up in federal patent infringement court and state court for theft of trade secrets & misrepresentation.



Now for a little technical!!!



As I become more familar with the high performance diesel pickups, a number of fuel system problems that you high performance enthusiasts must face become apparent. The current lift pumps are just that, lift pumps. High fuel flows to the engine with high return flows to the fuel tank create a very agitated and high volume of entrained air/vapor in the fuel. In a standard fuel system with an ordinary lift pump, the entrained air/vapor is then carried with the fuel back into the engine. This results, (because air/vapor is compressible) in retarded injection timing and lost power, etc. Additionally, over time this can cause damage to the injector pump, nozzles and tips. The attempt to obtain maximum performance from the high performance diesel requires high fuel flows which creates these conditions. The AirDog Fuel Preprorator is more that just a fancy lift pump. The AirDog can supply the correct pressure flows to your high performance engine with virtually all of the entrained air/vapor removed and with a low pressure warning/indicator light.

The AirDog filters to 6 microns we will soon, in about a month, have 2 micron StrataPore filters available).

For complete information call toll free 1-877-463-4373 or log on to www.ekstamworldwide.com



Thanks,



Charlie

 

[jebia]

It might not be broken.

It might not be broken.



I once had a stock lift pump that seemed to loose it's prime (had opened the fule system during a fuel pressure gauge swap).



I didn't have much gas in tank when I started the work.



I could hear the lift pump run but wasn't outputting any flow (at fuel filter canister).



I ran down to the station and and bought another five gallons of fuel and added it to the tank (same idea as pressuring the tank), and left the fuel door open while running the pump. The pump immediately regained prime.

 

[Kellydown]

Thanks to all who posted to this thread and didn't give up on my lift pump, but it is dead and buried. I tried to pressurize the tank, with no luck, the FASS showed up this afternoon and the install was easier than I thought. Truck started right up and has been purring ever since. I would have looked at the AirDog, but honestly had never heard of it untill this morning. The RASP doesn't look to be too friendly of an install. I cannot tell a difference with the FASS, but I have not had the chance for a real test drive.



Thanks Again

 

[rweis]

Would you ship me the dead lp? I would like to take it apart to see what the problem was and report back so we all can learn the what and why.



Bob Weis