Skip to main content ↑ ↓
Topic: Fuel tank/line question (Read 897 times) previous topic - next topic

Fuel tank/line question

1998 U-320 M11 Celect Plus with Aqua Hot in center of coach (batteries on driver side)

I'm trying to understand the supply and return fuel line and fitting setup on our fuel tank and could use some help.  This is new to me, and I'm a bit confused.

How many supply and returns lines are there for the main engine?

I've been reading past posts on replacing both main fuel lines, and generator fuel lines.

It appears that sometimes Foretravel put all the supply and return on the passenger side, and at other times the supply was on the passenger side while return was in the center of the tank and hard to get to.

Below is a photo of the top of our fuel tank.  To orient you...  The right side of the photo is where the open bay door is on the passenger side.  The top of the photo is facing the front of the coach.  The bottom of the photo is the back of the coach.  Left side of photo is towards the center of the coach where all the lines and hoses run through the chase.

I know the Aqua Hot supply and return is the smaller stacked fitting.

What are the three remaining fittings, and should there be a fourth fitting somewhere?

Thank you,
Chris

Re: Fuel tank/line question

Reply #1 –
I don't have the M11 like you do nor do I have Aquahot but my C8.3 had the following:

Main engine supply, generator supply, and fuel tank vent all in the center of the tank.  Main engine return and generator return were on the driver's side of the tank. 
Robert
Build # 5304
1998 34' U270 Cummins 6CTA8.3

Re: Fuel tank/line question

Reply #2 –
Quote from: Numbers –
I know the Aqua Hot supply and return is the smaller stacked fitting.
What are the three remaining fittings, and should there be a fourth fitting somewhere?

Chris,

Yes the stacked is your A/H suction and return.

Your coach has 1 engine supply. 1 engine return. Same for the generator and A/H.

On your coach the one nearest the camera should be your engine supply. I have seen this one and the generator one swapped.

The one with the spring clip is your tank vent. That hose comes through the front bulkhead and is terminated just about center of the coach just above the angle iron for the bulkhead.

The line behind and to the right is the supply line to the generator.

Your return lines are not visible from this shot.  One way to see the return lines on your tank is to remove the tank cover on the same side as the batteries.  Cut the battery area air vent tubes, remove them and then you will find your return lines. You can also pull the tank or some have cut an access hole in from the inside of the coach. I prefer to just pull the tank to get to them. Yes you have to empty the tank and take the basement door and related hardware off but that isn't that big of a job.

Pamela & Mike
Pamela & Mike 97 U 320

"It's not what happens to you, but how you react to it that matters."

Re: Fuel tank/line question

Reply #3 –
On our '99 the engine supply was in the center so was the generator. Look at reply #15 for a picture of mine. AH and batteries on driver side



Fuel lines
1999 40 ft. U-320 wtfe build 5563 Chuck & Lynda's "Rollin' Inn"  2030 watts solar
prev. mh's 71 GMC 5 yrs. 73 Pace Setter 1 yr. 78 Vogue 5 yrs 81 FTX 40ft all electric 18 yrs. 1996 Monaco Signature 3 yrs.
2014 Grand Cherokee Overland
Dream as if you will live forever. Live as if you will die today.  James Dean

Re: Fuel tank/line question

Reply #4 –
As Cman has shown his suction and return are just opposite of ours. Yours could be either way but you will have the same amount of hoses and the tank taps should be the same as shown in his pics. (our tank taps are laid out the same as his)

Pamela & Mike

Pamela & Mike 97 U 320

"It's not what happens to you, but how you react to it that matters."

Re: Fuel tank/line question

Reply #5 –
Thank you all for the replies, and the links to photos and descriptions of accessing and removing the tank.  It was extremely helpful.

Chris

Re: Fuel tank/line question

Reply #6 –
Quote from: Numbers –
1998 U-320 M11 Celect Plus with Aqua Hot in center of coach (batteries on driver side)

I'm trying to understand the supply and return fuel line and fitting setup on our fuel tank and could use some help.  This is new to me, and I'm a bit confused.

How many supply and returns lines are there for the main engine?

I've been reading past posts on replacing both main fuel lines, and generator fuel lines.

It appears that sometimes Foretravel put all the supply and return on the passenger side, and at other times the supply was on the passenger side while return was in the center of the tank and hard to get to.

Below is a photo of the top of our fuel tank.  To orient you...  The right side of the photo is where the open bay door is on the passenger side.  The top of the photo is facing the front of the coach.  The bottom of the photo is the back of the coach.  Left side of photo is towards the center of the coach where all the lines and hoses run through the chase.

I know the Aqua Hot supply and return is the smaller stacked fitting.

What are the three remaining fittings, and should there be a fourth fitting somewhere?

Thank you,
Chris


I just finished myself the replacement of the fuel supply and return lines on my 1997 U295 40' with 6C8.3 Cummins.  I noticed in your picture the cracks in the fuel line over the press on barbs of the fitting. They can allow air in causing hard starting and eventually total loss of prime resulting in no start.  If you have not already replaced, you will find these lines hardened and cracks the full length of these lines.  These should be replaced with low pressure hydraulic hose rated for diesel fuel.  I used a combination of Gates RLA and Eaton Easy Couple H201 hose.  The gates was RLA ( used for supply RLA-10 and return lines RLA-06 for main eng and generator) and the Eaton was H20110 ( the 10 at the end designates 5/8 H201 hose used for the low pressure short hose between fuel filter and lift pump.  They both are low pressure nitrate hose.  My supply was 5/8 to the Cummins, and was in the center of the fuel tank along with the supply (3/8) to the generator.  Both of my return lines for the Cummins and the generator were on drivers side edge of the tank along with the smaller vent hose.
97 U295 40, Build #5040, 6C8.3 325 HP
Oregon Continuous Traveler
Samsung Residential #RF20HFENBSR,
Xantrex SW2012, (3)AGM8D Hse, (2)AGM Grp24 Eng, Victron BMV-712, 1800w Solar 4 LG & 2 Sunpower
Extreme Full Body Pt w/hdlmps, new furn/floor, 4 down Lexus 2004 GX470 AWD curb weight 4,740 lbs
Prev: 1990 Barth, 10L 300 2 yrs; 91&92 Monaco Signature, 10 yrs, 10L C 300 &  6C8.3 300; 1997 ForeT 6C8.3 325 since May 2017.  Employed by Guaranty RV 14+ yrs.  Former VW New Car Dlr/Service Dlr, Sales Mgr, Rv Sales, and Service Adviser from 1968-2017
"Don't criticize what you can't understand" Bob Dylan