fuel system upgrades

[Gypsyman]

Richard, I checked out your site and your system look pretty interesting. My truck is stock, I'm primarily interested if your system would keep the truck running if my stock LP failed. My guess (and it's only a guess) is that when the stock LP fails it provides a restriction to fuel flow to some or all extent. (?)



Thanks,

Olin

Sorry for the delayed response. The '03-04. 5 kit replace the stock lift pump and are triggered by the factory harness. All functions stay the same as stock and your stock filter housing stays in place. The '05 kits will allow the stock in-tank pump to remain in place and just sit idle.



Richard

 

[OHale]

Richard, thanks for the info. I'm going to bookmark your site. Since I have an aux tank I'm reluctant to go to the in-tank setup if my LP fails. Looks like your pump kit would be a good alternative. That Walbro pump you have I would think would be sturdier than the factory LP.



O.

 

[KSears]

Sorry for the delayed response. The '03-04. 5 kit replace the stock lift pump and are triggered by the factory harness. All functions stay the same as stock and your stock filter housing stays in place. The '05 kits will allow the stock in-tank pump to remain in place and just sit idle.



Richard

Do you have the '05' kits ready or still being developed, please keep me posted as to the status when available , I am curious how such a s etup will work and hookup.

 

[AMassaro]

So if there are air traps in these systems, except for Richards'... , where exactly does this entrapped air go? Is it released into the atomosphere somewhere?

 

[Gypsyman]

Do you have the '05' kits ready or still being developed, please keep me posted as to the status when available , I am curious how such a s etup will work and hookup.

I have 90% of it complete now. The electrical pieces just hit the ground and I have a call in to the machine shop for the one remaining small part to make the pick-up tubes complete. As soon as the check valves hit the ground I'll be ready for a couple of beta testers.



If all goes as planned you'll be making a connection in the fuse box that allows factory ECM control of the new pump without codes or fuse taps.



Richard

 

[rbattelle]

My recollection and understanding is such; the design in the block incorporates air traps that pull off and hold the air that results from running the fuel thru a gear pump.

Now that's interesting. Like AMassaro asks, are there external vents for the air incorporated in the block?



-Ryan

 

[steved]

Now that's interesting. Like AMassaro asks, are there external vents for the air incorporated in the block?



-Ryan

If you would read the FASS instructions (available from many places online), the entrained air is returned to the tank via the return line (the FASS has a return line prior to the IP, unlike most of the homemade systems)... in the particulate filter (the horrible hydraulic filter), the intake from there is a long tube that pulls "air free" fuel from the bottom of the filter (air rises to the top as it is pushed through the filter media)... that is how the air is removed... I know the AirDog has another air removal method in addition to the FASS's.



The description of the FASS pretty much sums up how it works.



steved

 

[rbattelle]

If you would read the FASS instructions (available from many places online), the entrained air is returned to the tank via the return line (the FASS has a return line prior to the IP, unlike most of the homemade systems)... in the particulate filter (the horrible hydraulic filter), the intake from there is a long tube that pulls "air free" fuel from the bottom of the filter (air rises to the top as it is pushed through the filter media)... that is how the air is removed... I know the AirDog has another air removal method in addition to the FASS's.

Well that settles that. My Stanadyne filter head works exactly the same way. So if air removal isn't the distinguishing characteristic between my data and Steve's data, what else is there?



Why do you say the hydraulic filter is "horrible"? What's horrible about it?



On edit: this post is wrong - see ahead.



-Ryan

 

[steved]

Well that settles that. My Stanadyne filter head works exactly the same way. So if air removal isn't the distinguishing characteristic between my data and Steve's data, what else is there?



Why do you say the hydraulic filter is "horrible"? What's horrible about it?



-Ryan

Does your stanadyne filter pick the fuel up from the bottom of the filter?



THAT is the key... the return is only part of it... you also need to have the fuel being pulled from somewhere it isn't getting air. If you remove the filter from the FASS, it has a 3/4inch tube that is about 5 inches long that the fuel is picked up from the bottom of the filter... the tank return line is taken from a port in the head... so basically as the air and fuel penetrate the media, the air rises and enters the return line port to the tank, and "clean" pressurized air-free fuel is picked up from the bottom of the filter and pushed to the IP.



Everyone always has negative input about the use of hydraulic filters... what better filter?? It has a breakthrough pressure of over 100psi, more than the stock FASS can produce. . no chance of dirt getting to the IP... this is the main reason I shyed from the FASSII.



steved

 

[rbattelle]

Does your stanadyne filter pick the fuel up from the bottom of the filter?

Nope, I'm wrong. I was just thinking about how the Stanadyne works, and it does not pull fuel from the bottom, it pulls it from the top. Fuel enters the filter at the bottom, moves upward through the filter media, and is collected at the top. This is done to separate water (water will naturally fall to the bottom of the filter). FASS doesn't need to do this because a separate water separator is used.



The Stanadyne might have some feature in the head that removes air, but I'm not sure.



I am genuinely impressed with a 5% fuel economy improvement. Nevertheless, I won't be switching to FASS or Airdog.



-Ryan

 

[Benson]

I too have been mystified when I hear of better mileage with these delivery fuel mods. It shouldn't make any difference as the fuel is still regulated by the ECM before it's injected into the cylinders.



I'm wondering if the increased flow allows the fuel to be cooled more and therefore a little more dense (efficient) when injected into the cylinders.

 

[steved]

I too have been mystified when I hear of better mileage with these delivery fuel mods. It shouldn't make any difference as the fuel is still regulated by the ECM before it's injected into the cylinders.



I'm wondering if the increased flow allows the fuel to be cooled more and therefore a little more dense (efficient) when injected into the cylinders.

According to the TDR "know", pumping fuel to pump fuel creates heat...



steved

 

[cerberusiam]

Like I said, ya gotta believe it is better than other solutions.



In addition to the air removal the FASS also addresses the hot fuel issue and provides much better filtration than the stock filter. If you want to put stock in the info coming from Bosch the ability to push enough fuel thru a 2 micron filter may be worth it. When your done with the filtration issue go read the fuel temperature thread and decide how it fits.



Is it worth scrapping a functioning system that seems to be working fine? Probably not. It all depends on what ya wanta spend your $$$ on.

 

[Benson]

According to the TDR "know", pumping fuel to pump fuel creates heat...

But fuel that isn't used gets recycled to the tank and traveling through the lines more often could cool it.

 

[steved]

But fuel that isn't used gets recycled to the tank and traveling through the lines more often could cool it.

My point exactly, but I was shot down more than once by the know...



steved

 

[SKing]

steved I just have to back you up and say that I had a 21mpg truck before my fass. After fass I now see mpg 23 in city 25-27 on hwy. People in my town that have the same truck as me say that I just have a good truck. . What has me confused is my 06 only gets 18 city and 20-22 hwy. I think its because one is auto and the other standerd. They have the same gears also.

 

[RDyson]

25-27 on the highway????? I've not heard of an 03, or an 06 getting anywhere near that kind of mileage. Unless you are driving a 2 wheel drive at 50 miles an hour. If you are trusting the overhead for your mileage #'s, They may not be right.

 

[SKing]

Rdyson its members like you that have negitve things to say that make members like me no longer want to be a member of T. D. R. Do you think I would make a statement this bold without proof. Your in Texas Im in Texas I think you should find me and bring $70 with you to fill my tank and will go ride around so you can say not only have you HEARD of 25-27 on hwy but that you rode in the truck. And by the way if I drive at 50 miles an hour its about 28. 823 mpg and my truck is 4x4.

 

[nickleinonen]

the design in the block incorporates air traps that pull off and hold the air that results from running the fuel thru a gear pump.

if you are getting air into the system because of a gear pump, you either have a suction leak, or the pickup is too small [restricted] causing cavitation... .

 

[rbattelle]

Steved, can you post a couple plots of your data like I did? I'm curious to see your variations across the life of the truck. There are very few members who keep this kind of data, so I'm always curious to see others' numbers.



And SKing, with all due respect, I don't think RDyson was being disrespectful in any way. You must admit, 25-27 highway MPG is abnormally high. I'm not calling you a liar, I'm just curious how you manage to achieve such remarkable economy. Do you keep a detailed log?



-Ryan