FASS Fuel System Install to Alpine

[Alpine36]

Originally Posted by JSR4134

Alpine 36. Just wanted to throw out a thankyou for your post
Johnny Spiegel

Your welcome. Hope it helps if you are considering this upgrade.
FWIW, nearly 5,000 miles since the install, zero issues.
Coach runs great. Fuel mileage unaffected, noticeable light to mid throttle acceleration performance improvement...all for about the price of an ISC stock replacement lift pump.
Piece of mind not starving the CAPS unit, priceless.

[rikadoo]

Morning Alpine, I have a question, when you bypassed the lift pump, did you leave the return line still attached? my lift pump is now leaking with the pressure from the FASS pump and I just don't see a way to bypass the return side cause it uses a banjo fitting. also when you bypassed the lift pump did you cap the fittings on the old lift pump? I was amazed when I removed my old primary filter to install the FASS system and found such a restricted inlet to it, I know its for the one way check valve but what a difference of available fuel now going to the engine.

[Ljwt330]

Originally Posted by rikadoo

Morning Alpine, I have a question, when you bypassed the lift pump, did you leave the return line still attached? my lift pump is now leaking with the pressure from the FASS pump and I just don't see a way to bypass the return side cause it uses a banjo fitting. also when you bypassed the lift pump did you cap the fittings on the old lift pump? I was amazed when I removed my old primary filter to install the FASS system and found such a restricted inlet to it, I know its for the one way check valve but what a difference of available fuel now going to the engine.

From his second post/update:

"I bypassed the fuel feed in/out on the original lift pump with a AN10 male male fitting and capped the original fittings, but left the Caps pump return lines connected to the original lift pump manifold."

[Alpine36]

Yes, I left the return lines as built, capped the lift pump ports with female #10 caps and tied the lines together with a #10 male/male connector. Also, dont forget to disconnect the lift pump 12v connector and add the relay or you'll throw a check engine light.
We have driven about 5k trouble free miles this summer/fall with the FASS installed.

[Jeep401]

Originally Posted by Alpine36

Yes, I left the return lines as built, capped the lift pump ports with female #10 caps and tied the lines together with a #10 male/male connector. Also, dont forget to disconnect the lift pump 12v connector and add the relay or you'll throw a check engine light.
We have driven about 5k trouble free miles this summer/fall with the FASS installed.

What's the relay for? Is it just creating a load for the missing pump?

[Alpine36]

Originally Posted by Jeep401

What's the relay for? Is it just creating a load for the missing pump?

Yes, the ECU is looking for resistance (load) from the 12v lift pump while going thru it's 30 second priming routine every time the key is cycled to the run position. (wait to start)
It will throw a fault code 278? check engine light.
BTW, this is how I found out our lift pump failed electrically...well that and the fact I no longer heard the lift pump rattling away at pre start.
Simply cut the wires off the old lift pump, buy a standard Bosch style fog lamp relay and add female spade connectors to the cut wires. Hook them onto the coil terminals of the relay. Energizing the coil windings is enough load to "fool" the ECU. Polarity makes no difference which wires go to the coil terminals. The relay only stays energized for the 30-40 second lift pump priming cycle, then turns off.
You could probably accomplish the same thing with an old 1156 light bulb, or anything creating a load for that matter.

[andy29847]

Originally Posted by Alpine36

Imnprsd, and came equipped with only one single Fleetguard FS1022 water separating fuel filter in the rear filter bay. 10 micron.
So yes, I'm currently running all three filters. My plan is to filter 10 micron at the FASS and five at the original filter in the bay.

Could you list the parts numbers for the filters you plan to use?

[Alpine36]

I'm using the two FASS filters the titanium series pump comes with.
The FASS Particulate Fuel Filter PF3001 is rated at 144 micron.
The Fass Water Seperator Filter XWS3002 is rated at 2 micron.
These all "feed" the original Fleetguard FS1022 10 micron fuel filter in the filter bay. So far, so good. I like having the original filter in place in case anything in the original fuel line were to come apart. The dual FASS filters have a replacement interval of 30k miles, so I won't be changing those anytime soon. I have attached the link to the FASS filter page for your reference. Take Care, Mike
https://fassride.com/products/xws-3002-and-pf-3001/

[wolfe10]

Originally Posted by Alpine36

I'm using the two FASS filters the titanium series pump comes with.
The FASS Particulate Fuel Filter PF3001 is rated at 144 micron.
The Fass Water Seperator Filter XWS3002 is rated at 2 micron.
These all "feed" the original Fleetguard FS1022 10 micron fuel filter in the filter bay. So far, so good. I like having the original filter in place in case anything in the original fuel line were to come apart. The dual FASS filters have a replacement interval of 30k miles, so I won't be changing those anytime soon. I have attached the link to the FASS filter page for your reference. Take Care, Mike
https://fassride.com/products/xws-3002-and-pf-3001/

Wow, a 144 micron primary. That truly IS a ROCK CATCHER. Commonly accepted ratings are Primary= between 10-30 micron. Secondary to engine manufacturer's specs (generally 2-5 micron).


I have no problem making the OE filter "redundant"= finer filtration up stream of the OE filter.

[Ljwt330]

Originally Posted by wolfe10

Wow, a 144 micron primary. That truly IS a ROCK CATCHER. Commonly accepted ratings are Primary= between 10-30 micron. Secondary to engine manufacturer's specs (generally 2-5 micron).


I have no problem making the OE filter "redundant"= finer filtration up stream of the OE filter.

According to the FASS site, the 144 micron filter is placed on the suction side of the pump to reduce cavitation and pump noise. The 2 micron is on the pressure side, has no water drain because the filter element traps the water. These two filters must be used together.

[Alpine36]

Originally Posted by Ljwt330

According to the FASS site, the 144 micron filter is placed on the suction side of the pump to reduce cavitation and pump noise. The 2 micron is on the pressure side, has no water drain because the filter element traps the water. These two filters must be used together.

That is my understanding as well. Not sure I need to worry about the 10 micron FS1022 in the filter bay. It's a water seperating type also. Thankfully we've never had any fuel contamination issues. I'll continue to use Diesel Kleen and biocide on a regular basis and hope for the best.

[Ljwt330]

Originally Posted by Alpine36

That is my understanding as well. Not sure I need to worry about the 10 micron FS1022 in the filter bay. It's a water seperating type also. Thankfully we've never had any fuel contamination issues. I'll continue to use Diesel Kleen and biocide on a regular basis and hope for the best.

Agree that the 10 micron filter will probably never need to be changed except due to age of the filtering element.

My first thought was to swap the 10 micron with the 2 micron, assuming the threading on the filters match. That would make replacing the filter that is most likely to clog, the 2 micron, relatively easier to access. Further, it would keep the 10 micron in your "monitoring conscientiousness" as well as subject to the pressure gauge read-out.

[mg2016]

This has been one of the better threads I have read on this site. Been considering the FASS system but didn't like the concept of running a return line from the engine compartment through the basement forward. Fuel line under pressure in the basement made me uncomfortable. This forward mount idea is brilliant. Not sure if it will work on my Spartan chassis but I will doing a good search to see if it might work as time and weather permits



One question, any problems with noise, any passenger seat complants?


Thanks for sharing this information.

[Alpine36]

No complaints whatsoever. When we first installed it you could hear a faint high pitched whine, but that has completely subsided after a couple thousand miles. Some have reported they rubber mounted it to the FASS supplied bracket to eliminate any noise.
I do hear some strange noises from the passenger seat occasionally, but not from the FASS pump lol.
Honestly, if you can access the fuel tank fittings easily and have an extra unused vent bung, I wouldn't hesitate to mount it this way. Even if your original fuel supply lines were to develop leaks at least they are under pressure and wouldn't introduce air to the CAPS, not the case if the supply lines were under negative pressure (vacuum) like the cracked straw analogy...feel free to PM me if you have any questions. Mike