Just a bit curious here. With the "Air Dog" system priced out of sight there has been a lot of talk about the FASS system. It sounds like a real good set up; although I've heard it both ways. I've not heard anything about the RASP system of late. Is anyone got a relatively long term report on these? Seems like this system would be the "most reliable" of all. My stock lift pump is still OK but I want some real world reports in case anything goes south. Thanks!!

 

I've been running a Walbro GS392 fuel pump in Ford Superduties for years. (since 2000) I don't understand what all the fuss is about finding a good fuel pump for the Dodges.

The Walbro is a frame rail mount (inline), handles diesel and moves a lot of fuel. It is rated to supply up to 80 PSI continuous. The last one I bought was in 2001 and I think Walbro got bought out since then, so I am not sure where to get them anymore. They cost about $80 at the time. I see ads for them at $180, so not sure what has happened since then.

The Powerstrokes have a lot heftier requirements because they not only need a good volume of fuel, they also need it at a high pressure > 60 PSI. (Relative to the Cummins anyway.)

About the only thing you have to worry about is the wiring to the pump and the fuel pump relays. The 05 Cummins, for example, has the fuel pump drive feed coming out of the ECM. I'm not sure I'd want to run a 10A pump from that. You could put a relay on it though. I'm not sure if the Cummins ECM monitors the fuel pump current or not. It might not like a relay alone, you might have to fool it with a load resistor too.

http://www.gnttype.org/techarea/fuel...albroflow.html

Apparently you can drop these pumps in the tank too.

Here they are for $129. http://shopping.lightningmotorsports...-p-1-c-12.html

I was buying them wholesale, so I got a better price. I'd have to dig through 2001 receipts to find where I bought it.

 

I had the Fass system installed this week (monday)at Daves diesel shop located in Angola indiana.My first impressions are better fuel mileage(2mpg),throttle response,and better piece of mind verses the stock lift pump.From the folks I talked to (my local dealership and 3 diesel shops)The stock lift pump will not handle the HP boxes fueling requirements.My truck stumbled last week,check engine light came on with 2 codes(0192 fuel rail pressure sensor low & 0237 turbocharger boost pressure sensor low,while towing my trailer in the 60 HP position on my quad race box.I have had no problems since,I ran my quad race box this week in all positions 0-60-100-140,with the fass system setup, it has ran flawless,12-13 psi according to my fuel pressure gauge WOT.Time will tell the big story.I think Quadzilla and Fass make great products IMHO.coobie

 

Your 04.5 should have the in tank pump in and not the lift pump on the block. Mine is an 04.5 and that is the way mine is. If that's the case you will not have any problems with it.

TRAVIST

 

"The stock lift pump will not handle the HP boxes fueling pressures."

The fuel rail pressures have nothing to do with your lift pump. (In tank or not.) Higher rail pressures do not require a higher lift pump pressure.

HP boxes turn up the fuel delivery via higher pressures in the High Pressure rail, but all that does is require more VOLUME from your lift pump, not pressure.

 

Do you work on cummins diesel engines?Just curious?I talked to 3 very good diesel shops in the state of Indiana and my local dealership.They all told me the same thing I posted above Maybe they are all wrong?coobie

 

I work in the fuel injection industry. I don't believe everything some of these high performance shops say. I find that sometimes they don't know what they are talking about. I guess the same could be said for me from time to time...

They probably told you the "lift pump" wouldn't handle the "requirements" of a HP fuel box. (Whether it will or not is a different argument.) They shouldn't have told you it wouldn't handle the pressure requirements, because they are the same no matter what pressure the CP3 is delivering. The CP3 actually has a supply pump in it that boosts the fuel from supply pressure to anywhere from 80 to 180 PSI before it goes into the main HP pump.

Actually, when the CP3 pumps more fuel, the fuel supply pressure will normally fall, so your "lift pump" will see less pressure.

My sources for the supply pump info are Bosch booklets, The 2005 Ram shop manual (volume 3, page 14-110) and the Duramax training manual.

 

Superduty,I reread my post and I stand corrected.The folks I talked to did state the lift pump would not keep up with the fueling requirements of the HP boxes,as you stated,not pressure,I will edit my post.Thanks coobie

 

Only the '05's have the in tank pump the '03,4,4.5's have the lift pump mounted in the back side of the filter housing. the dealers are now retrofitting the others to the '05 pumps, there are no more of th previous model lift pump. but I think they still can't keep up.

 

My EZ set on #2 and up will suck my lift pump fuel pressure to "0" very easily. Now with the Juice with Attitufe it is even quicker to "0" pressure!

A Fass or another lift pump is in my near future!

 

"My EZ set on #2 and up will suck my lift pump fuel pressure to "0" very easily. Now with the Juice with Attitufe it is even quicker to "0" pressure!"

I wouldn't run it like that. The CP3 relies on excess fuel flow for cooling, just like the VP44 did, although not to the same extent.

I've been watching the posts on the "unknown knock" in these engines and I think it is related to worn CP3s. I suspect either debris in the fuel or hot fuel or fuel starvation or lubricity. My SD already has a Walbro GSL392 on it, so I should have plenty of flow. I'm putting a 2 micron Racor filter setup (120AS, $65) between the stock 10 micron filter and the CP3.

Hopefully my CP3 lives for a long, long time.

 

So If I went with a Walbro, would I need to use a pressure regulator?

 

"So If I went with a Walbro, would I need to use a pressure regulator?"

I don't know the answer to that question. I'll know when I run my Cummins with a Walbro. I guess it depends on the restriction of the CP3. As far as I know a pressure regulator shouldn't be required.

 

As to answer the question about needing a regulator........

I know that on the VP44 if you ran anything over 20-22psi of inlet preessure you would eventually blow the seals out of the internals of the pump from to much pressure....I have never taken one apart, but a couple of injection shops stated that this is what they saw with those type of inlet pressures.

Now will the CP3 handle higher inlet pressures and live, I am not sure?


Bill

 

OK, I don't understand something: how would you get 20 PSI of inlet pressure on a VP44 ?

A VP44 is a through flow pump, right ? You pump fuel and it goes through the VP44 and into the return line and back to the tank. When one tests a VP44 on a fuel injection test stand, one uses all the flow you can get from the stand because the fuel flow cools the VP44. Actually, they get really hot on a test stand and you have to do a lot of fuel cooling.

So... how does one get high inlet pressure on a VP44 ? Are you pumping so much fuel through it that the internal restriction causes the pressure to build to 20 PSI ? Or are people putting a checkvalve downstream of the pump to make sure the pump is fed with high pressure ?

(On Powerstrokes there is a checkvalve in the fuel canister that keeps the supply pressure at 60PSI or so to ensure the injectors get fed high pressure fuel. )

Back to the CP3... My GSL392 is going to pump 255L/hour. What sort of inlet pressure will my CP3 have ?