I just put some clear plastic motorcycle fuel line on the injector return lines and there's very little diesel going through them. After starting the engine the fuel was not visible in the lines for about 5 minutes. Is this normal?
When I pulled the return line off the out-bolt there was a good flow of fuel from the out-bolt but nothing from the injector return lines. What's happening, why isn't there fuel coming form the injectors?
I put new nozzles in the injectors about a year ago and have not had any problems. The car gets 38 mpg and runs good since my re-ring. (Other than the low oil pressure I just posted in another link!!!!!)
http://img834.imageshack.us/img834/424/p4190336.jpg
Injector fuel return lines - almost no flow!!!
Moderator: Fatmobile
Injector fuel return lines - almost no flow!!!
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1985 Jetta 1.6 TD
1981 Caddy (getting a 1.6TD)
1987 Quantum Syncro Wagon, converted to 2.0 TD August 2020
1986 Passat TDI
2006 Touareg V10 TDI
1996 CHevy 6.5 TD
1981 Caddy (getting a 1.6TD)
1987 Quantum Syncro Wagon, converted to 2.0 TD August 2020
1986 Passat TDI
2006 Touareg V10 TDI
1996 CHevy 6.5 TD
Re: Injector fuel return lines - almost no flow!!!
Some have posted here that there should be a fair amount of fuel coming from the injectors. My observations on my engine are the same as yours. It seems very little fuel flows from my injectors. Personally, I've never paid much attention to it.
Everybody else lists their cars here - but not me.
I have too many to count
I have too many to count
Re: Injector fuel return lines - almost no flow!!!
O.K., good!
I just don't want to ignore something that would be obvious to an experienced eye.
I just don't want to ignore something that would be obvious to an experienced eye.
1985 Jetta 1.6 TD
1981 Caddy (getting a 1.6TD)
1987 Quantum Syncro Wagon, converted to 2.0 TD August 2020
1986 Passat TDI
2006 Touareg V10 TDI
1996 CHevy 6.5 TD
1981 Caddy (getting a 1.6TD)
1987 Quantum Syncro Wagon, converted to 2.0 TD August 2020
1986 Passat TDI
2006 Touareg V10 TDI
1996 CHevy 6.5 TD
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Quantum-man
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Re: Injector fuel return lines - almost no flow!!!
Good tight OEM standard nozzles pass almost no diesel, as per leakdown test.
Pull the common line from banjo to injectors and you will get a jet of diesel, hence diesel seen in leakoffs is from returning fuel from pump.This back pressure is why the push fit lines are so prone to leaking
If you do actually have lot's of leakoff then nozzles are low spec...
Not the end of the world, but need to be a matched set of equal quality to avoid permanant differences in injected fuel volumes and uneven engine running
EDIT make that 'Leakoff'
Pull the common line from banjo to injectors and you will get a jet of diesel, hence diesel seen in leakoffs is from returning fuel from pump.This back pressure is why the push fit lines are so prone to leaking
If you do actually have lot's of leakoff then nozzles are low spec...
Not the end of the world, but need to be a matched set of equal quality to avoid permanant differences in injected fuel volumes and uneven engine running
EDIT make that 'Leakoff'
Last edited by Quantum-man on Sat Apr 21, 2012 12:58 pm, edited 1 time in total.
"I'm not here to help... I'm here to Pro-Volke"
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Be like meeee...Drive a Quantum TD
...The best work-horse after the cart...
Quantae grow on you...but Rabbits are like roses...
... girls like em ;o)
Only one Darwin, Einstein, Poe and Verne.
That is why if you listen, you will learn:
From the one and only Quantum-man,
Who sees the worms from outside of the can.
7 Quantae in 20 years; 4 dead and 3 TD's still alive [2 wagons & 1 fastback] oh and a GTD
)Re: Injector fuel return lines - almost no flow!!!
Ihave been there,so my return from injectors DONT go to OUT bolt it go direct to tank-no air in return line.
I`ll improve my English
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Quantum-man
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- Posts: 2085
- Joined: Mon Apr 24, 2006 4:34 pm
- Location: Gloucester; Limey-Land
Re: Injector fuel return lines - almost no flow!!!
That is a good idea. How do you enter the tank?mtran wrote:Ihave been there,so my return from injectors DONT go to OUT bolt it go direct to tank-no air in return line.
"I'm not here to help... I'm here to Pro-Volke"
Be like meeee...Drive a Quantum TD
...The best work-horse after the cart...
Quantae grow on you...but Rabbits are like roses...
... girls like em ;o)
Only one Darwin, Einstein, Poe and Verne.
That is why if you listen, you will learn:
From the one and only Quantum-man,
Who sees the worms from outside of the can.
7 Quantae in 20 years; 4 dead and 3 TD's still alive [2 wagons & 1 fastback] oh and a GTD)
Be like meeee...Drive a Quantum TD
...The best work-horse after the cart...
Quantae grow on you...but Rabbits are like roses...
... girls like em ;o)
Only one Darwin, Einstein, Poe and Verne.
That is why if you listen, you will learn:
From the one and only Quantum-man,
Who sees the worms from outside of the can.
7 Quantae in 20 years; 4 dead and 3 TD's still alive [2 wagons & 1 fastback] oh and a GTD
)Re: Injector fuel return lines - almost no flow!!!
Good question! How to you get the nozzle leakoff back to the tank?
1985 Jetta 1.6 TD
1981 Caddy (getting a 1.6TD)
1987 Quantum Syncro Wagon, converted to 2.0 TD August 2020
1986 Passat TDI
2006 Touareg V10 TDI
1996 CHevy 6.5 TD
1981 Caddy (getting a 1.6TD)
1987 Quantum Syncro Wagon, converted to 2.0 TD August 2020
1986 Passat TDI
2006 Touareg V10 TDI
1996 CHevy 6.5 TD
Re: Injector fuel return lines - almost no flow!!!
Perhaps because I have 2 tank and valves it`s eazy,but I don`t see why this will be prob with 1 tank,T on standard return long way from IP with oneway/check valve.In my case it`s after 3way return valve,but my flow from injectors is so little aka ~20 ml for 35 min,I have writen about.
I`ll improve my English