Yes, the crush washers are soft copper.
It might be a vacuum caused by a fuel line restriction,..
but a bad shaft seal or crush washer would allow fuel to syphen back immediately also.
I don't think you need a check valve,.. don't know where to get one that won't restrict the line.
Fuel issues
Moderator: Fatmobile
i believe i have removed all the fuel line restriction possibilities. removed the water separator, removed the check valve, replaced fuel line front to back, new fuel filter, cleaned the pick up screen in tank....
if i hook up a pressure gauge inline will it let me know if a vacuum is being created in the tank?
The injection pump never looses its prime. Tonight there was a huge air bubble taking up nearly the whole line going to the pump from the filter. but the car fired nearly instantly. not sure if thats helpful or not, but it dosent seem like air is entering the pump.
if i hook up a pressure gauge inline will it let me know if a vacuum is being created in the tank?
The injection pump never looses its prime. Tonight there was a huge air bubble taking up nearly the whole line going to the pump from the filter. but the car fired nearly instantly. not sure if thats helpful or not, but it dosent seem like air is entering the pump.
80 Rabbit 1.5D
91 Jetta 1.6TD Eco
91 Jetta 1.6TD Eco
If you put a vacuum gauge on your fuel line and it shows a restriction, then yes you could have an issue with the tank itself, or the vent system. The siphoning back to the tank may not be fast enough to pull all the fuel back from the IP. So, you're left with some fuel towards the IP, but air up towards the fuel filter. The fuel filter is the highest point in the fuel system.
Everybody else lists their cars here - but not me.
I have too many to count
I have too many to count
Copper Washers
To insure that a copper washer reseals (if you reuse them), anneal them before you put 'em back. Heat them red hot with a torch and then immediately dunk them in water. Softens 'em right up.
Aircraft mechanics do this with the copper spark plug washers in aircraft engines every time we remove them to clean the plugs.
TonyB
81 Dasher 1.6na
Aircraft mechanics do this with the copper spark plug washers in aircraft engines every time we remove them to clean the plugs.
TonyB
81 Dasher 1.6na
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- Global Moderator
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To anneal steel, you cool it slowly,
is copper the opposite?
Cooling steel quickly makes it hard and brittle, not soft
is copper the opposite?
Cooling steel quickly makes it hard and brittle, not soft
'91 Golf gasser converted to a 12mm pump, M-TDI.
'84 1.6TD Rabbit with a VNT-15 turbo, still setup to run on vegetable oil.
'84 GTI with 1.7TD pistons and intercooled.
2003 TDI wagon
2000 TDI Jetta.
'84 1.6TD Rabbit with a VNT-15 turbo, still setup to run on vegetable oil.
'84 GTI with 1.7TD pistons and intercooled.
2003 TDI wagon
2000 TDI Jetta.
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- Missing Linkz
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- Joined: Tue Oct 22, 2002 11:44 pm
- Location: Northern California
- Contact:
With copper, it essentially does not matter how fast or slow it is cooled:Fatmobile wrote:To anneal steel, you cool it slowly,
is copper the opposite?
Cooling steel quickly makes it hard and brittle, not soft
- http://en.wikipedia.org/wiki/Annealing_%28metallurgy%29
I think you need to use sophisticated cooling equipment to cool copper fast enough to get the hard/brittle effect.
BTW: I air cool my copper sealing parts.
'82 VW Caddy, 1.9D engine, FN tranny w/ Quaife, Missing LinkZ shift linkage
So I finally got to hook up the vacuum gauge. Had a alternator belt break and that set me back a bit. Anyway. The gauge only shows 1-2 inches when the engine is running and never changes under any load. So i dont think I have any sort of blockage or vacuum being created in the tank.
I guess my next option is to check the crush washers. After that all thats left is a Pump Reseal? The thing that drives me nuts is that I never see any fuel leaking.
I guess my next option is to check the crush washers. After that all thats left is a Pump Reseal? The thing that drives me nuts is that I never see any fuel leaking.
80 Rabbit 1.5D
91 Jetta 1.6TD Eco
91 Jetta 1.6TD Eco
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- Global Moderator
- Posts: 7566
- Joined: Wed Oct 30, 2002 10:28 pm
- Location: north central Iowa
I usually don't see much fuel around a bad shaft seal,
I can usually rub my finger behind the injection pump sprocket and come back a little diesely.
I once pulled the line off the fuel filter and had fuel flow out of the bad shaft seal.
I'm pretty sure:
Because of passageways that allow residual pressure from the pressure regulator to feed back to the front of the pump and shaft bushings:...
The shaft seal is at the same pressure as the front of your pump so with a small vacuum, air would be pulled in,..
fuel would not be pushed out.
vacuum should be close to zero but up to 5 isn't bad.
I can usually rub my finger behind the injection pump sprocket and come back a little diesely.
I once pulled the line off the fuel filter and had fuel flow out of the bad shaft seal.
I'm pretty sure:
Because of passageways that allow residual pressure from the pressure regulator to feed back to the front of the pump and shaft bushings:...
The shaft seal is at the same pressure as the front of your pump so with a small vacuum, air would be pulled in,..
fuel would not be pushed out.
vacuum should be close to zero but up to 5 isn't bad.
'91 Golf gasser converted to a 12mm pump, M-TDI.
'84 1.6TD Rabbit with a VNT-15 turbo, still setup to run on vegetable oil.
'84 GTI with 1.7TD pistons and intercooled.
2003 TDI wagon
2000 TDI Jetta.
'84 1.6TD Rabbit with a VNT-15 turbo, still setup to run on vegetable oil.
'84 GTI with 1.7TD pistons and intercooled.
2003 TDI wagon
2000 TDI Jetta.