Detail: Need help urgent, for isuzu 4jx1 3.0 diesel engine , please advise what course the diesel stop flowing back to the diesel filter?
Solution: I assume you are asking what causes diesel drain-back? This is when a vehicle is not used for a while the fuel drains back towards the fuel tank leaving the fuel pipes empty and causes extended starting times or starting and then stopping or simply not starting. It isn't unusual with some older vehicles. There are usually a number of nonreturn valves in the fuel system that are supposed to prevent it happening and in addition because it is supposedly an airtight system the fuel would usually be retained by outside air pressure. A little wear here and there, a little erosion caused by microscopic particles in the fuel and a little corrosion from unavoidable nasty stuff in the fuel and after a while new things become old. O rings stop being efficient and canister type fuel filters can be imperfect and allow air into the fuel lines. Few diesel vehicles have a submerged tank mounted electric fuel pump but those that have are superior in these respects as they have a pressurised fuel line instead of a fuel line with negative pressure. A common modification has long been to fit an additional inline nonreturn valve to prevent drain-back. These days it is more common to fit an inline hand-prime pump - a rubber bulb complete with nonreturn valves. preferably in the supply line from the tank to the filter. , Hi, a 6ya Mechanic can help you resolve that issue over the phone in a minute or two. Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US. click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need. Goodluck! , normally 110 nueton metres. use nut lock and once you have torqued you will feel if you have to tighten it a bit more. , cant start deisel 3.0 lilter sounds like there is no fuel getting to the engine , Yes it pays to have a Turbo timer or let it run for 3 minutes after an outing. An Intercooler is usually fitted to turbo charged engines.It cools the air entering the engine making it denser,Thats why cars go really well on frosty mornings after they reach running temp. Hope this helps. , It sounds like the fuel is gelled, is it cold where you are and what are running for fuel? If your in freezing weather you should be running blended fuel, straight No.2 will gel at about 25 degrees (F). Take a hair dryer or heat gun and warm the fuel filter up. Or if you can get in warm garage and get it started thin the diesel with kerosene, about 2 gallons to 20 gallons of diesel. Then drive it for at least five miles so the kerosene gets circulated through the system. I've used gasoline to do this too, but only use about 1 gallon to 20 gallons of diesel. , If you are sure that the engine oil is coming into the combustion chamber, then you have to overhaul the engine. After the overhaul is done, have it calibrated and and clean the exhaust pipe to get rid of the black smoke. And! remember, for diesel engines a big black smoke will always come out the exhaust if you suddenly step on the gas too deep and then over-revving it. (I mean always, that's why roadside emissions people are so stupid when stepping on the gas, they always step on it suddenly and over-rev it, it's a sure fail)