Engine/Transmission (1998.5 - 2002) RASP as the primary - Fass as the backup?

[rweis]

Thinking it may be time for a RASP system. Just wondering if you need special tools for adding the new pulley for the belt drive. . And did I understand correctly, that you can push fuel though the RASP if the belt goes away? Will the VP pull through it? Is a regulator mandatory at the VP44? Would go with the Jet cans soon, but just looking at getting a system up and running for now and looking at options. Thanks.

Pulley tools are a socket to do the bolts that hold the dampener on (and the new pulley shaft) and a hex key wrench for the pulley,



The pump is an external gear pump (You can not push fuel through an external gear pump (RASP) OR an internal gear pump (Walbro)),



The regulator (You get a byapss valve regulator with the system) is mandatory because the pump pumps more fuel than the VP can swallow. You basically set the input VP44 pressure with the bypass valve,



You get a Hobbs switch to turn on your backup electrical system if anything ever goes wrong with the RASP (belt breaks),



I use JetCans because there are more spring and shim choices withthe JetCan bypass valve than with the RASP bypass valve.



I have run mine since 03 (91k miles), and expect it to run several hundred thousand more miles. Truely the last lp you will ever buy.



Bob Weis

 

[PRout]

Bob, Thanks for the info. Dan at FASS contacted me and is offering very good customer service on the motor problem, so yes, I think this will make for a nice system and after re-thinking and re-reading, I agree that overkill on our fuel supply situation is in reality, only just adequate. So, it does look like it will be a FASS/RASP system in the near future as if either one fails, the other is of the quality that a person could be confident they will make it home without running the VP dry, plus it retains the 2 extra FASS filters.

I looked up the jet cans, so will probaby will go that route as well.

Will report back as to how it all works out, might be a little while, but it's going to happen.

Tnx

 

[Turbo Terry]

Always interested in whats new for the fuel system for my 99 as it has been a problem over the years. The RASP has pretty much solved this problem using the stock lp as a primer and backup although that being said it would be nice to lose the stock lp altogether has it can still fail on you. Also what is a Kinsler JetCan bypass valve I did a search and did not really get anything of substance. And where can I purchase a new regulator and hobbs switch for my RASP as a spare?

 

[Graphic man]

i have run the RASP for over 4 years now with no problems..... and i run the stock L/P for a back up and when i first hit the key



Scott

 

[rweis]

You can get a hobbs switch at a real auto parts store (NAPA etc) I think they are like $50.



The JetCan is a bypass spring loaded regulator like you got with the RASP system, but has a whole series of different spring tensions and shims so you can really fine tune the PSI. They are called Kinsler JetCans. Kinsler is a major racing setup company (Indy cars etc).



I find that I can start the CTD just fine without the electric lp. When the engine first starts to rotate you get about 6 psi and by 1 or 2 rotations you have 10+ psi and the first cylinder is just starting to light off you have 12 psi and by the time you release the key you have your preset psi.



I put my electric lp on a on / off switch in the cab and only use it to purge air from the fuel lines anymore.



Bob Weis

 

[PRout]

Sure liking these reports, thanks.

The fass unit pumps a LOT of fuel (probably with less entrained air than most others since it has the bypass bleeder back to the tank built in) and is a great pump. Just starting to see that the constant duty cycle an electric pump has to endure to keep our VPs well fed takes its toll on brushes, etc. Not sure any electric pump has much of a chance for longevity (this is debatable, but not from what Ive seen so far on this rig). Also, even though they are considered sealed units, being mounted down low exposed to the elements like that cant help their situation either - except for good cooling.

A good mechanical pump combined with an electric type as a backup is looking better all the time. If you already have a heavy duty type electric unit like a fass, airdog, or even walbro, that would make for a pretty tough combo. The built-in bypass of the fass is a convenient bonus. My truck just endured a trip with no operating lift pump, just half inch fuel lines and didnt miss a beat pulling fuel through the fass bypass. That was pressing my luck, but it did work (hopefully without long term stress affects).

 

[rweis]

Exactely why I went with a mechanical pump, brushes are going to wear regardless, comutators are going to wear regardless, bearings are going to wear regardless.



I even researched industrial mechanical pumps as a replacement to the RASP. The RASP is built pretty tough. IF (and I do mean IF) the RASP ever fails there are oil field gear pumps that would fit that are designed to pump continuously for minimum of 100,000 hours (about 11 years) and then are totally rebuildable and have been in service since 1980. They can even pump molten lead if you want that. Mechanical external gear pumps (like the RASP) are tough.



Then put a good heavy duty electric pump like a fass, airdog, or even walbro as a backup and you have a pretty unbeatable combination.



Bob Weis

 

[PRout]

Exactly why I went with a mechanical pump. . . . there are oil field gear pumps that would fit that are designed to pump continuously for minimum of 100,000 hours (about 11 years) and then are totally rebuildable and have been in service since 1980. They can even pump molten lead if you want that. . . . Then put a good heavy duty electric pump like a fass, airdog, or even walbro as a backup and you have a pretty unbeatable combination.

Wow! gimme gimme (where's that little jumpin' thingie) Oo. :-laf

Added: Actually, just the basic Rasp pump kit with fittings for half inch lines and a one-way bypass path around it in case of its failure would do the job. Would like to use the hobbs switch to activate an audible/visual alert in the cab so you can manually throw the switch to turn on the electronic pump and push fuel around the rasp. Then with the jet can regulator at the VP, a person would probably be in biz. (just keep an extra belt in the survival kit).

Come'on RASP vendors, PM me with some numbers before I get busted spending money again! (hehe)