Evening all,
Hit a bit of a wall in trying to self diagnose an issue I am having with my 2001 HZJ79. This truck is a conversion from ex-fire service in Japan and just hit 26,000kms on the ODO.
Modifications that were done are a new 90L fuel tank and fuel filler neck from another 70 series. The truck came with a 60L tank that was situated on top of the pump on the rear of the truck fitted by Morita.
For the last 6-8 month or so I have been dealing with what I feel is air in the fuel line. In second gear the truck seems to stutter or lag around 2800rpm and I notice white smoke from the exhaust. Initially this is the only time it would do it and it was not consistent at all. More recently I have been taking the truck up to the Mtn to ski. After a day of skiing I start my truck and let it warm while I load the gear etc. I then start my decent and I notice a significant increase in white smoke and power lag/loss/chug as I accelerate. Eventually it goes away.
I have no issues with initial cold start up either.
I had taken the truck to my local diesel shop and was suggested it could be related to no tank breather valve and a build up of pressure with elevation change. However I notice the lag not only at the mtn but in town, that being said its significantly more noticeable up the mtn. The mechanic recommended adding a breather valve so I did this. There are three hard lines coming off the OEM neck provided with my tank. The main filler, return, and the 3rd was left open with a breather valve. I had noticed prior to adding the breather valve there was some pressure when undoing the fuel cap. I have read others have the same and it is "normal"?
I have yet to change the fuel lines. I have inspected them all and there appears to be no visible signs of deterioration or cracking. Check all the clamps and everything seems as it should be.
Back in the fall I did attach some clear tubing and noticed some air getting through after passing through the fuel primer. So I replaced the fuel primer and filter.
Now that it is winter and no access to a shop I am tempted to take the truck in and get a professional mechanics opinion but wanted to reach out to the LC community before making such a bold move.
Cheers and thanks for chiming in!
Hit a bit of a wall in trying to self diagnose an issue I am having with my 2001 HZJ79. This truck is a conversion from ex-fire service in Japan and just hit 26,000kms on the ODO.
Modifications that were done are a new 90L fuel tank and fuel filler neck from another 70 series. The truck came with a 60L tank that was situated on top of the pump on the rear of the truck fitted by Morita.
For the last 6-8 month or so I have been dealing with what I feel is air in the fuel line. In second gear the truck seems to stutter or lag around 2800rpm and I notice white smoke from the exhaust. Initially this is the only time it would do it and it was not consistent at all. More recently I have been taking the truck up to the Mtn to ski. After a day of skiing I start my truck and let it warm while I load the gear etc. I then start my decent and I notice a significant increase in white smoke and power lag/loss/chug as I accelerate. Eventually it goes away.
I have no issues with initial cold start up either.
I had taken the truck to my local diesel shop and was suggested it could be related to no tank breather valve and a build up of pressure with elevation change. However I notice the lag not only at the mtn but in town, that being said its significantly more noticeable up the mtn. The mechanic recommended adding a breather valve so I did this. There are three hard lines coming off the OEM neck provided with my tank. The main filler, return, and the 3rd was left open with a breather valve. I had noticed prior to adding the breather valve there was some pressure when undoing the fuel cap. I have read others have the same and it is "normal"?
I have yet to change the fuel lines. I have inspected them all and there appears to be no visible signs of deterioration or cracking. Check all the clamps and everything seems as it should be.
Back in the fall I did attach some clear tubing and noticed some air getting through after passing through the fuel primer. So I replaced the fuel primer and filter.
Now that it is winter and no access to a shop I am tempted to take the truck in and get a professional mechanics opinion but wanted to reach out to the LC community before making such a bold move.
Cheers and thanks for chiming in!