FASS Installation on Cummins ISL in Monaco Dynasty

[src]

thank you I will

[jacwjames]

FASS pumps with and without filter.

Since my Monaco already has a primary and secondary filter what would be the benefit of getting the FASS pump with filters. Seems redundant.

I like the idea of adding a fuel pressure gauge that would be an indicator of fuel filter issue.

[src]

Z Motorsports how are you plan on doing the gauge cluster and where are you going to mount them if you don't mind me asking

[zmotorsports]

Originally Posted by src

Z Motorsports how are you plan on doing the gauge cluster and where are you going to mount them if you don't mind me asking

I have a full documentation of how I fabricated my gauge console with a lot of pictures over on my Monaco Dynasty mods/repairs thread. The gauge console begins @ post 1252.

Here is a link to the page.
https://www.irv2.com/forums/f115/mod...237276-90.html

[src]

I will take a look thank you

[cruizerEd]

Just curious but why make this modification? What problem or deficiency does it address?
Would this be something a more modern Cummins owner should consider? We have a 2012 Cummins ISB XT 6.7L on a freightliner chassis and I haven't noticed any fuel problems. Or perhaps I have had any fuel problems acute enough for me to notice.

[38Chevy454]

Nice installation Mike. I agree, electric pumps work best as pushers rather than pullers. Good idea with the fuel pressure gauge to monitor if filters are getting plugged up.

[JBradC]

We have a 400ISL in our 2007 Tour. Runs great. What am I missing?

[jacwjames]

Originally Posted by JBradC

We have a 400ISL in our 2007 Tour. Runs great. What am I missing?

Not a thing, I believe your rig has a different injection pump so you have nothing to worry about when it comes to the transfer pump.

But like almost every other DP, I'm sure something else will break!

[zmotorsports]

Originally Posted by cruizerEd

Just curious but why make this modification? What problem or deficiency does it address?
Would this be something a more modern Cummins owner should consider? We have a 2012 Cummins ISB XT 6.7L on a freightliner chassis and I haven't noticed any fuel problems. Or perhaps I have had any fuel problems acute enough for me to notice.

Originally Posted by JBradC

We have a 400ISL in our 2007 Tour. Runs great. What am I missing?

There is plenty of documentation addressing the potential issues with the CAPS pumps and system leading up to the injection pump. This modification is more specifically to address the Cummins CAPS system from approx. 1999-2003 model year Cummins ISC and ISL engines. However, I feel even the newer HPCR systems can benefit from a positive pressure fuel delivery system, but that's just my opinion. Our coach was running perfectly for the 19 years and 130k miles prior to this modification and this was purely preventative.

[Trexoffroad]

Very nice work! I’m currently installing the FASS on my 99 American Tradition. Opted to install in rear and run the return line back to front.
One question I have for you is: do you know if there is a problem running the fuel through the stock filter just before the caps pump? That is the route I am on. My untrained mind feels it’s just an added filter but bypassing it seems like a lot more work for little payoff. In the end, I’ve got 4 filters now. Filter before original lift pump to FASS filters to Original second filter and then To CAPS pump. Am I way off on doing it this way?
Thanks!

[mackwrench]

Originally Posted by Trexoffroad

Very nice work! I’m currently installing the FASS on my 99 American Tradition. Opted to install in rear and run the return line back to front.

One question I have for you is: do you know if there is a problem running the fuel through the stock filter just before the caps pump? That is the route I am on. My untrained mind feels it’s just an added filter but bypassing it seems like a lot more work for little payoff. In the end, I’ve got 4 filters now. Filter before original lift pump to FASS filters to Original second filter and then To CAPS pump. Am I way off on doing it this way?

Thanks!

That's how mine is plumbed. .... only I'm not using the Air Dog or FASS pump with filters, mines a Airdog Raptor pump, after the primary and before the secondary filter.

You can purchase a filter diverter that simply threads on in place of either of the OEM filters...the factory secondary probably ain't going to do much since the FASS pump filter is very fine.


But to answer your question, yes. I see no issue with how you described it.

[zmotorsports]

Originally Posted by Trexoffroad

Very nice work! I’m currently installing the FASS on my 99 American Tradition. Opted to install in rear and run the return line back to front.
One question I have for you is: do you know if there is a problem running the fuel through the stock filter just before the caps pump? That is the route I am on. My untrained mind feels it’s just an added filter but bypassing it seems like a lot more work for little payoff. In the end, I’ve got 4 filters now. Filter before original lift pump to FASS filters to Original second filter and then To CAPS pump. Am I way off on doing it this way?
Thanks!

You will be fine. I kept the old secondary filter in my system which is just prior to the CAPS pump. The reason I kept it was because I mounted my FASS up front and it was quite a distance between the FASS and the CAPS pump and I wanted one last filter before the CAPS injection pump as a little extra insurance.

[Rob_M]

Originally Posted by zmotorsports

Lastly, here is the video of the installation of the FASS fuel pump on our coach.

I found your YouTube video by accident just perusing cummins motorhome vids. Good job, and thanks for taking the time to document.
Planning to do a FASS install also, but wifey always has other ideas about how to spend my limited time off lol. My lift pump was replaced by previous owner, and I’ve been watching for leaks.

I really want to install the pump up front but would have to drop the tank to access the fittings on the top middle of the tank. I can’t see them without a mirror let alone reach them.