How much fuel pressure does the CP3 need? What are you guys using for lift pumps?

[steved]

My FASS made a fuel mileage difference in my truck... I know it works.



steved

 

[99Supercab]

My FASS made a fuel mileage difference in my truck... I know it works.



steved

Hehe, fuel mileage is a relative thing here Steve. Yes, the FASS does work, the main question to me and my dad was, was it worth the money ?



As for the mileage thing, I drive heavy footed, so I don`t expect to see great mileage, and with the mods I have now, the 18-19 mpg that I`m getting right now is very livable for me.



To each thier own, that what is boils down to.

 

[cerberusiam]

No arguments here, simply info and ideas.

but that 5/16th`s metal line isn`t gonna flow that much anyway

It's sure going to flow more at say 60 psi than it would at the stock pressures. Look at it this way once: small return line, only adequate flow for the needs, return line run to the bottom of the sending unit. Now the return line dumping fuel right back next to the intake can't be a good thing from a heating stand point but it does make sense when the design is to prevent as much aeration of the fuel as possible.

I don`t believe its as important as those companies would like you to believe it is

Thats a good question. Is it marketing hype, a valid point, or a placebo product? Pittsburgh Diesel did a bunch of tests on the AirDog back when it came out and highly endorsed it along with the OTR guys that bought it. Could be marketing spin as they were selling it or it could just be the truth. They did make some valid points with it though. Diesel with entrained is bad from several different points. One, it slows down and impedes the combustion process causing variables in the injection mix and burn patterns. Two, it reduces the lubricity of the fuel.



On a 12V engine with big injectors and a oil lubed pump I would tend to agree. But that is not what we are dealing with here. The HPCR motor is already running on fuel without an adequate cetane rating for the most part. Its running a lot less fuel and at way higher pressures. Most importantly the fuel is being used to lube some pretty close tolerance high pressure parts that show a definite problem with inadequate lubrication.



Given there is a raging debate over fuel economy, and the price of diesel is way above what it should be for the quality, and the parts are waaaay expensive to replace, and there are some definite issues showing up, I am just researching all the avenues and looking at all the things that could be affected.



Just read thru the threads that are posted. There is a common theme with rough idling, failing injectors, failing pumps, etc, etc, etc. Its obvious that the stock systems need some help and I think it is in delivery, filtering, and fuel prep. I have yet to talk to somebody with a FASS or AirDog that didn't like it, price aside of course. I am not looking to justify the FASS (still :-laf MAO over that) or influence anybody to spend more or less than they want to. Just presenting the results of my research and ideas for consideration. Do with them as you please and no warranty explicit or implicit is implied.



As far as an alternative to the FASS, SD's design using the Walbro is related in cost only. It cannot remotely compare to the benefits, proven benefits I will add, that the FASS provides. That seems to get some peoples goat but its nothing personal, just my assessment. If anyone feels the need to reject my arguments, reject the price, reject whatever they fell the need to, please go ahead. It literally makes no difference to me. I am here to neither dissuade or persuade, only inform.



I am not closed minded about anything I have said here. All opinions are welcome and if anyone has concrete info that refute the points I made please post it. I am searching for knowledge as much as SD and am not about to reject anything that makes sense. I have already heard a lot of the "I don't believe the entrained air is a problem" opinions but have yet to hear anybody back that up with some concrete info. If that info is out there I may have to rethink MY plans. Cheers.

 

[steved]

Hehe, fuel mileage is a relative thing here Steve. Yes, the FASS does work, the main question to me and my dad was, was it worth the money ?



As for the mileage thing, I drive heavy footed, so I don`t expect to see great mileage, and with the mods I have now, the 18-19 mpg that I`m getting right now is very livable for me.



To each thier own, that what is boils down to.

I stated that just for information, not to be an smartass.



steved

 

[99Supercab]

I stated that just for information, not to be an smartass.



steved

Oh, I know man, no offense taken at all.



cerberusiam



You make some good points. Just for some more back ground reading on this, check this thread out



http://www.dieseltruckresource.com/dev/showthread.php?t=87890



More specifically, here, starting with post #80. This was the discussion concerning alot of these same things over on DTR



http://www.dieseltruckresource.com/dev/showthread.php?t=87890&page=6&pp=15



I`m not trying to start anything here either. If my opinions or views are wrong about this, someone please correct me. I am in no way an expert on any of it. I welcome the discussion, though, as it makes me, and hopefully others, think about how these fuel systems work. Ya never know, eventually someone might actually come up with a solid working solution. We`ll never know if the Walbro, or any other brand/style pump, is that solution till someone goes out and trys it.

 

[steved]

Being I have a FASS, I am quite happy so far... but I agree with everyone... it is still an electric motor even if it is now brushless and a claimed "million mile motor. " But at the same note, even mechanical things fail... not as frequently, but they do.



The FASS was a nice all inclusive kit, filters better than factory, solves the flow volume/pressure issue, and is made for a diesel... and has a warranty. It is very similar to a AirDog, but at a much lower cost.



And as far as the motor running hot, if it was spec'd properly it shouldn't matter.



As for the FASS heating fuel, I'm sure it does, but I have not seen it heating fuel enough to make a difference... it isn't like it is heating it significantly IMO or more than what happens from just radiant engine heat.



There again, we need to look at it this way... what we would like to have happen and what we can reasonably acheive are two different things. What we can figure out on a environmently controlled bench might take a ton of $$$ to acheive in the real world... there has got to be a compromise.



steved

 

[99Supercab]

There again, we need to look at it this way... what we would like to have happen and what we can reasonably acheive are two different things. What we can figure out on a environmently controlled bench might take a ton of $$$ to acheive in the real world... there has got to be a compromise.



steved

Amen bro, I completely agree.

 

[Concrete Solutions]

SuperDuty:



I am very impressed with your walbro solution.

So much so, that not only am I going to do my 03, but a friends as well.

And as another 03-04 is in my future so I'll get enough parts to do that one as well.

I made a deal with a local auto parts store and will buy 4 pumps for a good discount.

so I will have a spare should a defect in one of the 3 happen. We all make our

living with our trucks, down time is too costly.



I read 70-75+ pages of posts regarding your system.

Why you have gotten the flak you have is BEYOND my comprehension.



I Think you should change your screen name to "JOB".



I've yet to find a good source for the back plate on our fuel filters where the OEM

lift pump is mounted currently, and I can't find the nice green translucent hose you

used on the bypass. I too want to be able to see though it to monitor fuel

flow.





I want to thank-you for your considerable time in posting all the information.



I was sold in the first couple of pages.



Rich

 

[99Supercab]

SD isn`t a member here I don`t think, but I will make sure he see`s your post.