RASP Pump Availability

[PRout]

I just called DTT and they are not selling the RASP unit anymore.

Apparently they may be working on a new version. That may be a good thing, but I am looking to buy the original because it is a "Proven" setup. Not interested in being a guinea pig for a new product, especially when it comes to our fuel systems. btdt 2 much...

Is there anyone still selling RASP kits??

Just replaced my fass pump to the new "quiet" version under a great warranty by FASS which is definitely quiet and back to pumping lots of fuel. It will become the backup as I am looking to go mechanical for the primary.

 

[PRout]

Copied from another thread:

Stefan eluded to this a couple of weeks ago, that someone there (DTT) was working on a new RASP pump system.

I got one of the orgionals, had a little weeping at the front seal after 3 years or so. DTT sent me a new seal kit, did not stop the weeping. Then they sent me a redesigned RASP pump. The redesign had a much longer bearing housing at the pulley shaft end so a more complete packing could be installed. It looked like the same external gear cut and shafts, just a longer packing box.

IF DTT does not come up with a updated system I can make copies of about a year of research of internal and external pumps volumes, pressures, viscosity capability, manufacturer. There are some external gear pumps that would make a really good replacement.

The biggest problem I was finding was a drive system. I think you could use the Boss Pump drive (which is sort of a takeoff of the first design of the RASP pump) and the component parts are available from GDP. The ratio of crankshaft to pump shaft speed is 3:1 for the RASP.

I researched a fractional hp (1/7 hp) dc motor with something like 100,000 hours MTBF. Totally field rebuildable in about an hour, brushes changable from external access, totally sealed bearings, self cooling, harsh environment rated. I was going to direct couple the motor and pump and put a PWM (made by the motor manufacturer) on it to get 1000 shaft speed which was the optimum efficient speed of the pump.

The whole thing was going to be about $300 and should be good for 3,000,000 miles. I wanted something that would easily outlast the truck, i. e. NEVER visit the lp thing ever again.

I did not put the system together. It was fairly long (~ 24"), fairly heavy (~10 #). I have an Industrial Engineer inlaw and he thought probably 200,000 hours MTBF for the motor and never change the pump as it could pump molten lead, it is that tough. Pumping diesel fuel would be no effort at all.

Finding a pump that will do 60 GPH (bypassable to match the VP44 input) at 14 psi is sort of tricky. Many pumps have much higher pressure, much higher GPH. It's acutally is a pretty small pump.

It will be interesting to see what DTT comes up with. I have always been real happy with their products and service. I think you can bet it will be a good pump system.

NOTE: I even put a dynamic balancer on my 02' with the RASP gilmer belt system. Very tight, very close tolerances, but do able. Ads say it can not be done, it can be very carefully.

Bob Weis

Yeah Bob, glad to know you are around. . Can always count on getting the details and you're usually about 3 steps ahead of me.

For me, a proven system in kit form is what I would prefer due to limited free time and honestly, think I've had enough of experimenting with fuel setups and being covered in diesel. :-laf Kind of hoping there may be a leftover RASP kit available somewhere.

 

[BSwope]

Did u ever hear of the Mitusa system or the GDP Fuel Boss system? They are both mechanical and very similar to the Rasp!

 

[AHire]

Welcome to Intelligent Engineering, Inc - Manufacturer of the strongest high performance diesel parts in the world!



This is a link to the MITUSA pump system. From what i understand the original maker of the RASP pump. I have a buddy that got one and it seems to have a heavier pump and pulley system. I had a RASP on my truck for two or three years until it had issues. So I went with a Raptor electric pump. Now that i have seen the MITUSA kit im gonna get one to run as my primary, since it seems to be a better design than the one i took off.

 

[rweis]

DTT is working on a newer version of the RASP. Might want to check that out. If you wanted to, you could get the engineering data for the external gear pumps I found and see if they will fit the RASP mounting pattern.



The 3 pumps I had narrowed it down to:



Clark Solutions Model 1S

Oberdorfer Pumps N2000

Haight Pumps DIU-3U-3



Remember you are going to run the pump at the speed that gives you what you want because of the PWM, not at 1800 rpm. The motor is the RAE M4400 With the RLVS PWM. RAE is the only fractional hp dc motor manufacturer with their own PWM so you know the two are compatiable.



I reviewed my notes and the cost is closer to $515 not $300 as I recalled earlier.



Should be interesting,



Bob Weis

 

[Turbo Terry]

I must say i am always interest in the AMAZING fuel systems of one of the finest diesel engines built. My 99 has a Rasp and a stock LP. If you are leaking fuel at the shaft you are running or have run the belt to tight. Mine is very loose and alto its scary at times it is a cog belt and needs very little tension. Just my nickles worth.

 

[PRout]

Did u ever hear of the Mitusa system or the GDP Fuel Boss system? They are both mechanical and very similar to the Rasp!

Had heard, but havent checked them out. Will do, so far they are looking interesting. .

AHire:
Welcome to Intelligent Engineering, Inc - Manufacturer of the strongest high performance diesel parts in the world!

This is a link to the MITUSA pump system. From what i understand the original maker of the RASP pump. I have a buddy that got one and it seems to have a heavier pump and pulley system. I had a RASP on my truck for two or three years until it had issues. So I went with a Raptor electric pump. Now that i have seen the MITUSA kit im gonna get one to run as my primary, since it seems to be a better design than the one i took off.

Checking this out, looks like there are still options available. .