FUEL SYSTEM 70 SERIES

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Bushtrack1

Joined
May 5, 2019
Threads
2
Messages
14
Location
Africa
I've been told that not all 1HZ Engines came with two filters for the fuel, this true? Mine only has the main filter / water seperator assembly, does not having the pre - filter warrant changing the main more frequently?
How often are guys flushing out fuel tanks?
 
Maybe a dealer option add on, but ive always seen a single filter, but most add a second filter in Oz and most 3rd world where contaminants run rampant.

i change mine every 2nd to 3rd oil change. I dont think ive ever flushed out a tank, but ive heard of clogged pickups, mainly from rigs that have been sitting for a long while.
 
I would say depending on mileages and where it was used is how I would decide about the fuel system.

You can always open the sender in the tank and peer in and see if it's nasty or not. If the tank looks clean I would leave it alone. If there is some stuff in the bottom, you could always drain and refill.
If it's brown and looks like molasses at the bottom or stinks like varnish, you will need to pull it and clean it. Lacquer thinner does wonders for that.
Keep that fuel clean, you don't want to replace injectors or the IP. Ask me how I know.
 
LDowney said:
In lieu of mechanically flushing the tank, have you considered running a few tanks of bio-diesel this summer? Bio has the reputation as a flushing for diesel systems.
Click to expand...
Stay close to home when doing this. Bio diesel will indeed help flush contaminants but depending on the amount of crud in your fuel system may serve to completely stop up your fuel filter. (I know this from personal experience)
 
Bushtrack1 said:
I've been told that not all 1HZ Engines came with two filters for the fuel, this true? Mine only has the main filter / water seperator assembly, does not having the pre - filter warrant changing the main more frequently?
How often are guys flushing out fuel tanks?
Click to expand...


It was an optional extra in Australia but became standard around 95-96. My troopy already had the bracket, and I found the filter head with a new filter for $20 at a wrecker. I change them both once a year.
 
Bushtrack1 said:
does not having the pre - filter warrant changing the main more frequently?
Click to expand...

Theoretically, yes. But it also saves the main filter if you get some contaminated fuel. The prefilter is about 1/3 the cost of the main filter. On my other HZJ75 I noticed it was losing power and upon further inspection I found the pre filter covered in an orange substance (more orange than the one below) which I presumed was rusty water in the fuel. The pre filter is an open filter which means you can inspect it without cutting it up. I replaced it and regained full power.

1973558
 
Thanks for all the info. 20 bucks for that used one is pretty good. East Africa its 60. Prices are out of control here.
 
I'd also look at buying or making a funnel filter to catch crap before going into the tank. If pumping from barrels keep the intake off of the bottom as water lives there.
 
double filter come stock with the Africa version .
European version come with 1 fuel filter only .

If your diesel has a small percentage of bio diesel , then keep an eye in your tank .
Biodiesel tends to be igroscopic , and prone to develops a good ground for molds and alghe.
There are biokillers to add every 5-10 tank fill,so to kill all alghe , but the filter may need an early replacement.

In europe we have low sulfure diesel fuel , with a max of 7% of bio diesel allowed .
This has generated a huge set of problems in IP , due to a lower lubricant action , and the grow of alghe in the tanks .
Not all are aware of it , long sitting time of the car can result in cogging the fuel system when you run it after 1-2 month of non use .
Be careful , it could result in an expensive repair bill .
 
There is a seal and gaskit kit, but metal parts are bought as needed.
 
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