Removing / Dropping the Fuel Tank on a M1165A1 ECV

[GTUnit]

I searched, watched youtube videos, and went through the TMs. The M998 tank removal procedure does not work on a M1165A1 because the tank uses 4 steel hardlines for fuel and vent. These lines crossover the top part of the transfer case and get hung up on the transfer case if one tries to drop the tank in the same manner as a M998.
Do all these steel lines need to be disconnected at the top of the tank before it can be dropped?

If thats the case there is no point in disconnecting the rubber lines on the side of the tank, from underneath, as shown in the old TMs.

EDIT: I figured it out. I will edit this thread into a HOW TO instead.

 

[HookEm]

Strong work! Thanks for posting.

 

[Retiredwarhorses]

Removing the fuel tank is the same on every truck regardless of model….I just did an M1123 last week.

 

[GTUnit]

Removing the fuel tank is the same on every truck regardless of model….I just did an M1123 last week.

Looks like I misread the instructions. It does say to disconnect the hard lines from the top of the tank.
I was reluctant to mess with the flares since my line wrenches did not fit over 2 of them but luckily standard open end wrench works fine. They are not tight like brake lines.

 

[Mogman]

I would assume you would just disconnect the lines at the tank, the TM was written before the fuel tank access door was standard, that crossover vent line is kind of a PITA but doable.

Removing the fuel tank is the same on every truck regardless of model….I just did an M1123 last week.

So you do not have to disconnect the lines on top? not all HMMWVs have an access door on top.

 

[Retiredwarhorses]

I would assume you would just disconnect the lines at the tank, the TM was written before the fuel tank access door was standard, that crossover vent line is kind of a PITA but doable.

So you do not have to disconnect the lines on top? not all HMMWVs have an access door on top.

there is no reason to disconnect the hard lines to drop a fuel tank…the only trucks that don’t have an access panal are A0-A1, but a kit was developed to install the panal, which can be done with the tank still in the truck.

 

[GTUnit]

The reason to disconnect the hard lines is shown in the OP photos. The hard lines cross over the top of the transfer case. To a degree where they cannot just be pushed aside. Not without mangling them. My tank is not coming down without disconnecting the lines at the top of the tank.

On this model tank and this version hardlines they overhang the transfer case quite a bit. I dont see how they can be moved aside without trashing them.

This photo is taken with camera centered on the tank fittings:



Just for reference:

 

[Retiredwarhorses]

The reason to disconnect the hard lines is shown in the OP photos. The hard lines cross over the top of the transfer case. To a degree where they cannot just be pushed aside. Not without mangling them. My tank is not coming down without disconnecting the lines at the top of the tank.

On this model tank and this version hardlines they overhang the transfer case quite a bit. I dont see how they can be moved aside without trashing them.

This photo is taken with camera centered on the tank fittings:

View attachment 876862

Just for reference:
View attachment 876863

your welcome to do it anyway you like, I do maybe a
Tank every month, drop the DS, drop the rear rotor protection, disconnect the fuel line from the frame rail lines, remove the fuel filler, remove the vent lines, remove the straps, slide the tank down at the rear and slide it backwards and out…installation is reverse with front nose and fuel line inserted up and between the tcase.

 

[Mogman]

The reason to disconnect the hard lines is shown in the OP photos. The hard lines cross over the top of the transfer case. To a degree where they cannot just be pushed aside. Not without mangling them. My tank is not coming down without disconnecting the lines at the top of the tank.

On this model tank and this version hardlines they overhang the transfer case quite a bit. I dont see how they can be moved aside without trashing them.

This photo is taken with camera centered on the tank fittings:

View attachment 876862

Just for reference:
View attachment 876863

OK now I see what you are saying, my M998 lines run the same way although less of them (went back with two supply lines both with socks and one vent line), I had no problem pulling the tank with them in place

 

[TNDRIVER]

The reason to disconnect the hard lines is shown in the OP photos. The hard lines cross over the top of the transfer case. To a degree where they cannot just be pushed aside. Not without mangling them. My tank is not coming down without disconnecting the lines at the top of the tank.

On this model tank and this version hardlines they overhang the transfer case quite a bit. I dont see how they can be moved aside without trashing them.

This photo is taken with camera centered on the tank fittings:

View attachment 876862

Just for reference:
View attachment 876863

WHY did this tank have to come out???????

 

[GTUnit]

your welcome to do it anyway you like, I do maybe a
Tank every month, drop the DS, drop the rear rotor protection, disconnect the fuel line from the frame rail lines, remove the fuel filler, remove the vent lines, remove the straps, slide the tank down at the rear and slide it backwards and out…installation is reverse with front nose and fuel line inserted up and between the tcase.

I respect your expertise on the subject. I tried it every which way and the back of the tank kept getting hung up on the diff yoke.
The tank had 10 gallons of fuel in it. Maybe that was the issue. I supported it with a jack but the weight may have prevented the maneuverability needed.
(I didnt drain it because I couldnt risk spilling fuel at this particular location)

 

[Retiredwarhorses]

I respect your expertise on the subject. I tried it every which way and the back of the tank kept getting hung up on the diff yoke.
The tank had 10 gallons of fuel in it. Maybe that was the issue. I supported it with a jack but the weight may have prevented the maneuverability needed.
(I didnt drain it because I couldnt risk spilling fuel at this particular location)

you have to drain the tank, 10 gallons of fuel is heavy as hell.

 

[Mogman]

You can siphon yes?

 

[Retiredwarhorses]

You can siphon yes?

5 gal buckets and pull the tank plug…

 

[Milcommoguy]

5 gal buckets and pull the tank plug…

Plug likely needs replacing anyway.

Sleep better knowing it new, CAMO

 

[Mogman]

5 gal buckets and pull the tank plug…

Yes I understand that but if not spilling ANY is important you can control the siphon but you cannot put the plug back in.

 

[GTUnit]

WHY did this tank have to come out???????

This HMMWV sat in the yard without a gas cap. To be thorough I pulled the tank to clean everything out

Yes I understand that but if not spilling ANY is important you can control the siphon but you cannot put the plug back in.

Yeah the plug was a pain to get out even with an empty tank. I found an old plug inside the tank. I understood why it was in there after I realized the easiest way to get the old, decrepit, plug out is to push it in.

I can siphon, just thought it would be cleaner dropping the tank with the fuel in it. Lesson learned.

BTW this little $12 harbor freight battery operated transfer pump is excellent. Doesnt have a long hose to siphon, but tank to tank, its great,

 

[Retiredwarhorses]

Plug likely needs replacing anyway.

Sleep better knowing it new, CAMO

never Reuse a tank plug, they will just leak.

 

[Retiredwarhorses]

This HMMWV sat in the yard without a gas cap. To be thorough I pulled the tank to clean everything out


Yeah the plug was a pain to get out even with an empty tank. I found an old plug inside the tank. I understood why it was in there after I realized the easiest way to get the old, decrepit, plug out is to push it in.

I can siphon, just thought it would be cleaner dropping the tank with the fuel in it. Lesson learned.

BTW this little $12 harbor freight battery operated transfer pump is excellent. Doesnt have a long hose to siphon, but tank to tank, its great,

I’ve used that same pump to de-fuel tanks from the fuel sender hole when the tank is full, once it can’t get anymore, I just pull the plug.