Hello, on my 1977 CCC 410. The fuel tanks are currently port and starboard side close to the salon. Aka sit forward in the aft state room. 

which, the fuel fill lines run directly down from the deck into the tanks .

im going to be moving the fuel tanks. Aft in the stateroom. 

my question is. If I kept the fuel fill ports on the deck where they are. And ran fuel lines down, under the floor to the relocated tanks. Would there be enough gravity to get all the fuel in or would some be stuck in the fill lines?

if this is a issue, what’s the solution ? Relocate fuel fill or? 

thanks 

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I see many questions that need to be answered. 

1.  Where will the "burp/vent screens" be located?

2.  How will you know they have burped if you are at the side fill? You weren't going to ignore them were you?

3.  How will you route and support the hoses to preclude accumulation in low spots? 

4.  Will this modification pass underwriters muster?

I don’t understand your last question, underwriters?

otherwise I’ll make sure I vent correctly 

Timothy "Tim" Miller said:

I see many questions that need to be answered. 

1.  Where will the "burp/vent screens" be located?

2.  How will you know they have burped if you are at the side fill? You weren't going to ignore them were you?

3.  How will you route and support the hoses to preclude accumulation in low spots? 

4.  Will this modification pass underwriters muster?

Insurers 

You kind of loose me at running the fuel lines under the floor to the relocated tanks.

If you mean running the fill line under the aft cabin sole to the fuel tank, then back up to the tank fill port, you are going to have problems. You are creating a trap in the fill line routing which will require require the tank vent line to handle the full fuel flow volume while filling the tank.

In your current configuration, the fill line also acts as a vent in conjunction with the tank vent while filling. If everything is working correctly, the tank fill will burp as the tank approaches max safe fill capacity. If I have interpreted what you intend to do, the fill line will not properly burp and more than likely going to cause fueling issues such as splash back, fuel spilling and in general a very slow fill rate.. This behavior will likely really endear your boat to your local marina fuel dock employees.

Another issue I would caution you in is that you are talking of moving a substantial amount of mass, 2100lbs, towards the stern in a hull that already tends to run bow high and need the trim tabs to keep the bow down at the desired running height.

If you look at the various floor plans for the 41/410, the aft and bow heads were moved accordingly to maintain the desired mass moments. Unless your plans take all of this into consideration, you will be designing a flawed floor plan though it might pass muster on appearance.

I appreciate all your insight and I will keep this in mind when changing the layout. The goal is to change the layout to another layout the CCC offered. Aka one center located bed towards the stern. And fuel tanks usually go under it. Moving the head to the starboard side close to the stateroom stairs. Basically matching the layout of the master stateroom from two beds, to one bed 

now just the matter of, how to fill the tanks 

Ronald Zick said:

You kind of loose me at running the fuel lines under the floor to the relocated tanks.

If you mean running the fill line under the aft cabin sole to the fuel tank, then back up to the tank fill port, you are going to have problems. You are creating a trap in the fill line routing which will require require the tank vent line to handle the full fuel flow volume while filling the tank.

In your current configuration, the fill line also acts as a vent in conjunction with the tank vent while filling. If everything is working correctly, the tank fill will burp as the tank approaches max safe fill capacity. If I have interpreted what you intend to do, the fill line will not properly burp and more than likely going to cause fueling issues such as splash back, fuel spilling and in general a very slow fill rate.. This behavior will likely really endear your boat to your local marina fuel dock employees.

Another issue I would caution you in is that you are talking of moving a substantial amount of mass, 2100lbs, towards the stern in a hull that already tends to run bow high and need the trim tabs to keep the bow down at the desired running height.

If you look at the various floor plans for the 41/410, the aft and bow heads were moved accordingly to maintain the desired mass moments. Unless your plans take all of this into consideration, you will be designing a flawed floor plan though it might pass muster on appearance.

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