Is it difficult to change fuel injectors on rav4 1995 how do ya check if they are dirty there was a diesel contamination in petrol tank about 5liters have drained tank and bleed fuel lines still won't start would sparkplugs be affected

mate, remove spark plugs and crank the engine over for 5 to 10 second periods with a 1 minute break in between (to allow for your starter motor to cool down) and you should be able to smell when they are clear, replace spark plugs and repeat process as necessary.

Drain the fuel out and flush the fuel lines and the filter. Failure to purge the unleaded fuel from the system can destroy the engine due to severe pre ignition.

do you put petrol or diesel in the tank
if you put petrol in the tank then it has spark plugs and injectors
if you put diesel in the tank it has injectors only

for diesel fuel to congeal it has to be poor quality with a high paraffin content close to 0 degrees c or contaminated. I would go for contaminated from a fungus growing in the fuel. Get a sample of the fuel from the tank and if it is a grey slimy mess then that will be the fungus. All diesels use a return line from the injectors that lubricates and cools the injectors.and this hot fuel creates a humid atmosphere in the tank so hat when the tank cools down the fungus grows in the condensed water. Try a wynns diesel fuel treatment product as it is pretty good at killing the fungus and cleaning the tank out.

You did not mention if it is diesel or petrol. If it is diesel then the sludge will be a moss contamination the grows in the fuel when there is water present. It is black to motley grey and is a bit slimy. It occurs when the fuel tank is not filled completely after use and the hot fuel from the injectors cools down creating moisture (condensation) in the tank. IT can be cured with a liberal dose of diesel fuel conditioner but you will have to change the filters a couple of more times . IF it is petrol the amount of sugar used would be so much that nobody could afford to do it. so check for some other problem . Dirty fuel from a lower quality servo will be more likely the answer to the sludge and there are fuel conditioners that will help here.. There is no connection to fuel and starter problems so check the battery by having a load test done on it to check for failing cells. Starter motors either work but do not have enough power to turn the engine over (battery-dirty terminals) or do not work (starter motor --relays --wire connection fuses). Change the fuel filter weekly if necessary and moniter the amount of contaminant getting stopped by the filter. Flush out the tank in it doesn't get less. By a lockable fuel cap to prevent further problems.

Diesels need to be clean and typically after 10,000 miles removing the fuel filter produces very little in the way of dirt and grit.

You had the tank and lines cleaned out and a new pump and presumably a new filter and still you find dirt and grit in the filter after a short time. ..
Either the tank, etc. wasn't cleaned out or more dirt has entered the tank since, either from more dirty fuel, from dirt ingress into the tank while the car is in use or the third possibility is something is wearing rapidly and the dirt is appearing in the tank to be recirculated after being sent along the fuel return line. If this is what is happening it throws suspicion onto the high pressure pump...

If the high pressure pump is failing it is surprising one or more of the injectors hasn't failed.

If you got dirty fuel the filter should have trapped everything that was likely to damage the injection system until performance reduced and eventually the engine stopped due to fuel starvation. Replacing the fuel filter with a suitable amount of care should then restore performance to the previous level.

Fuel filters are great for trapping dirt but not so good for other liquid contaminants. Water fortunately tends to remain at the bottom of the tank and the bottom of the filter cavity but other things might pass through the filter - acids, salt solution, solvents.
A couple of years ago there was a case of a few petrol filling stations selling fuel contaminated with seawater and shortly afterwards a lot of injectors needed replacing...

I think if my car had the problem your car has I would temporarily fit an inline filter to the fuel return line and drive it for a time. Two things should happen if the dirt is self-generated. The new inline fiter when cut open should show the dirt and grit you usually discover in the main filter and secondly, there should be a reduction in the amount of dirt and grit you find in the main filter, however any dirt at all in the inline fiter means my best advice is to take the car to a good diesel specialist for proper diagnosis and a guaranteed repair.

If dirt is found in the fuel return line there can be no half measures - the business end of the injection system needs surgical-level cleanliness.

Good luck!

indicates that the fuel was petrol and not diesel
best id to drain the tank , change the fuel filters and refill with the correct fuel
could be contaminated tank at the station but as most have a petrol and diesel hoses side by side it is easy to fill from the wrong hose

Try changing the fuel filter. If that does not help, have someone test the injector pump for pressure. Last would be a compression test on the cylinders. Drain oil and replace oil filter very soon.

What has happened is the diesel fuel is a lubricant and gasoline is a solvent. As gasoline is much thinner, it could wash down the cylinders and get into the oil pan thinning the oil and ruining the bearings. This would be the reason to test the pressure in the cylinders to find out if you lost compression with the rings in the cylinders.

Next, the injector pump for the diesel has seals and tolerances for inside components. Again, since gasoline is a solvent and not a lubricant, the internal parts could be worn out by not having diesel fuel to lubricate the injector pump parts.

If someone working at the fuel station made this mistake, all the costs should be paid by the station. This is something which could be taken to court if the station does not pay.

White smoke on diesel engines, means water in combustion chamber. Blue smoke means oil.
In what condition was the filter you removed? How bad? Temperature issues? Missing coolant maybe? If yes, you might as well have an internal leak. Some gasket maybe. Check all you vital fluids levels. If anything missing, take the time to empty the engine oil on a can, and check the colour. If it will look like chocolate brown, then you do have a leak from the inside.

The "MOST EFFECTIVE
" way is to REMOVE The FUEL TANK and DRAIN it By Tipping it over to Pour From FUEL INLET HOSE. Im Sure you Dont want to Here this as it Requires Much WORK . , BUT It IS The MOST EFFECTIVE Way to EMPTY The TANK.