80 LandCruiser with Fuel Tank Leak... Options? (1 Viewer)

[LongDuck]

17650E Valve, Vacuum Switching to the best of my knowledge; its been awhile (7yrs!). In fact, I recall Murf saying the faulty part was less than $5 to replace, but that they don't replace very many of them, so possibly part 23285A Valve, Check #1 is the right part...?

What I would recommend is to get the FSM test procedure out while you have the intake manifold handy, pull each of these valves, and run the test. If it tests good, leave it alone. My issue seemed to be a fluke, because it thwarted diagnostic efforts twice!

As to reinforcing fuel tanks at that spot with JB Weld or something - the issue occurs when the above valve(s) are faulty and prevent venting of the fuel tank pressure, which causes the expansion / contraction cycle resulting in oil can fatigue cracks. If you have excessive fuel tank overpressure, such as removing your gas cap and fuel shooting out, might be worth looking into the above valves and testing them.

After vent, vacuum valve replacement (*and an expensive new OEM fuel tank), I only get a gentle hiss of fuel tank pressure when I remove the cap these days. That hiss is probably the volume of air held in the lines between the tank and the charcoal canister, to be honest. Any more than a hiss is pressure being contained.

I hope this made sense...

 

[verruckt1]

Thanks so much Thomas. Great advice as always.

 

[wardharris]

PREVENTATIVE MAINTENANCE FOR A NEW LX
For what it is worth, I have spent the last 5 years representing Long Range Automotive fuel tanks as co-owner of Long Range America (LRAM). We have sold a number of auxiliary (42 and 24 gallon capacities) and replacement (37 gallon capacity) tanks for the 3FE and 1FZ-FE powered 80s/LX 470s (also non-US spec diesels - both manual and auto trans models).

As my 71st birthday approaches, I am headed toward (semi) retirement, handing off all meaningful work/responsibilities to Aidan Stott and Khris Korell - my two partners at the firm. Coincidentally, I finally bought an 80 (well, an LX 450) and the first thing I did (after delousing the truck after 4 years of storage) was to purchase a replacement fuel tank from LRAM inventory.

I have heard a number of sad tales from 80 owners, reporting leaky OEM tanks and scarce replacements from Mr. Toyota. Many of our main tank sales have been to replace failed tanks (along with 47% increase in fuel capacity for the 1FZ-FE models). There are some NOS tanks out there - @ARJMN and @Delta VS (Dave Schenker) have both scored lately, but I am lazy and had one on the shelf.

The LX is getting a new short block and valve job, but next up after that is installation of the LRA tank, along with new fuel pump, sending unit and related hoses, valves, etc. and a Delta combo console - shifter and center models. Hopefully won't have to drop the tank again.

Not a sales pitch, but an FYI regarding an alternative to repairing the failed tank or looking for OEM NOS. If you are interested in what it looks like/how it installs, the install document is attached and you can see the tank here TLC80FR-PA-US - Long Range America - https://longrangeamerica.com/product/tlc80fr-pa-us/

Hope this helps provide another option.

Cheers,
Ward

PS / EDIT 4-26-22
I did not intend this a a sales post, just wanted to share some information. That said, there are a BUNCH of dealers for these tanks on MUD. Just a few.....
Georg at Cruiser Brother @orangefj45
Dave at Delta @Delta VS
Mikey at Exit Offroad @crikeymike
Ryan at OTRAMM @OTRAMM