Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > THE OWNER'S CORNER FORUMS > Monaco Owner's Forum
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
Thread Tools Search this Thread Display Modes
Old 02-05-2023, 07:36 AM   #1
Junior Member
kschitoskey's Avatar
Join Date: Dec 2008
Location: Albuquerque, NM
Posts: 25
Fuel line size

I'm in the final stretch with my FASS instal. I mounted it in engine bay to L of primary fuel filter. My question is this: I have all these fittings and some leftover 1/2" fuel hose. Can I replace the line going between my FASS and the secondary fuel filter with 1/2" fuel line? Will that be enough to feed an 8.3 ISC? I know the stock is slightly larger with 10 AN fittings. I appreciate the ease of putting a union on the original fuel lines by the now-unused lift pump, but the idea of replacing the 24 year old fuel line with new is quite tempting.
1999 Monaco Dynasty 40' with slide
kschitoskey is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free! RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 02-05-2023, 08:11 AM   #2
Senior Member
jacwjames's Avatar
Monaco Owners Club
Join Date: Jun 2014
Posts: 12,773
Hard to say as the original configuration relied on first the transfer pump to push fuel to the filter and then after it shut off the CAPS pump to pull fuel all the way from the tank.

My gut says you'd be fine but personally I wouldn't do it. Not worth the risk.

When I installed my FASS system I was reluctant to use the hose for the supply side since it was not a reinforced type hose. I was afraid that over time it might become soft/pliable and with the suction might collapse. So I went to NAPA and had a hose made using wire braided hosing. I did use the hose for the return side that sends excess fuel back to tank, I didn't feel there was much risk there.
Jim J
2002 Monaco Windsor 38 PKD Cummins ISC 350 8.3L
2005 Jeep Grand Cherokee w/5.7 Hemi
jacwjames is offline   Reply With Quote
Old 02-06-2023, 09:56 AM   #3
Senior Member
zmotorsports's Avatar
Monaco Owners Club
Join Date: Feb 2009
Location: Utah
Posts: 2,746
Personally, I prefer to use steel braided fuel line on the suction side to prevent collapse such as Jim mentioned.
Mike & Chrystal/ FMCA # F315002
2003 Monaco Dynasty Baroness/2011 Jeep JKUR with 6.2 liter LS
Our 2003 Monaco Dynasty Mods/Repairs Thread
zmotorsports is offline   Reply With Quote
Old 02-06-2023, 07:24 PM   #4
Junior Member
kschitoskey's Avatar
Join Date: Dec 2008
Location: Albuquerque, NM
Posts: 25
Good advice - thank you. I'll confine the use of the push lock tubing to the pressurized side (post-FASS) in the engine compartment. In the interest of fewer restrictions I went ahead and sourced some 10AN fuel line and fittings to complete the FASS ->secondary filter setup. Would probably have been OK with 1/2", but I figured the coach builder used 5/8" line for a reason. At least peace of mind for me. Thanks for the replies.
1999 Monaco Dynasty 40' with slide
kschitoskey is offline   Reply With Quote


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
New fuel line from generator to fuel tank. J Wiles Rexhall RV Owner's Forum 18 08-27-2022 12:02 AM
New fuel line from generator to fuel tank. J Wiles Class A Motorhome Discussions 11 01-08-2022 12:29 PM
Not sure must have missed 2nd inline fuel filter on fuel line to generator Brecklundin Rexhall RV Owner's Forum 2 02-17-2019 08:31 PM
Fuel return line size from filter to tank M&EM Workhorse and Chevrolet Chassis Motorhome Forum 2 04-22-2015 08:33 AM
Fuel Line -- Fuel Filter tjshively Alpine Coach Owner's Forum 4 12-08-2011 08:10 PM

» Featured Campgrounds

Reviews provided by

All times are GMT -6. The time now is 11:38 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2023, vBulletin Solutions, Inc.