By Sazerac - Mon Jun 14, 2021 6:37 pm
- Mon Jun 14, 2021 6:37 pm
#85378
Hi All
We have seen many threads in other places about the right methods to attach fuel hose to fuel line fittings. The best practices here are clear. What we have seen little discussion about is the actual material of the fittings to which the hoses are affixed and that we screw together.
When I recently replaced the fuel damper under the airbox I did quite a bit of testing and temperature cycling to make sure that I did not create any leaks. To my chagrin and consternation, on the first temperature cycling I found a weeping line, one that I hadn't even touched. This was the hard factory steel fitting to the aluminum fuel cooler. These lines had been replaced say 4.000 miles ago.
This led me to think about GB's lines, which I have on both my GTs. His fittings seem to be aluminum. This means that by using his lines I have introduced many steel to aluminum connections in my fuel system. Whereas the steel fittings are virtually indestructible, how are people tightening aftermarket lines like this? Is there any evidence to suggest that material differences (say CTE, etc.) cause these lines to loosen, if not tightened to a certain threshold?
I repeat this thread is not indicating that one of GB's lines failed. It is rather the opposite, I noticed a factory steel to aluminum connection that was weeping and am now wondering about other connections simply because I introduced aftermarket parts increasing the number of steel to aluminum connections. So, how are people tightening these? Are these material differences an issue? What's your opinion?
We have seen many threads in other places about the right methods to attach fuel hose to fuel line fittings. The best practices here are clear. What we have seen little discussion about is the actual material of the fittings to which the hoses are affixed and that we screw together.
When I recently replaced the fuel damper under the airbox I did quite a bit of testing and temperature cycling to make sure that I did not create any leaks. To my chagrin and consternation, on the first temperature cycling I found a weeping line, one that I hadn't even touched. This was the hard factory steel fitting to the aluminum fuel cooler. These lines had been replaced say 4.000 miles ago.
This led me to think about GB's lines, which I have on both my GTs. His fittings seem to be aluminum. This means that by using his lines I have introduced many steel to aluminum connections in my fuel system. Whereas the steel fittings are virtually indestructible, how are people tightening aftermarket lines like this? Is there any evidence to suggest that material differences (say CTE, etc.) cause these lines to loosen, if not tightened to a certain threshold?
I repeat this thread is not indicating that one of GB's lines failed. It is rather the opposite, I noticed a factory steel to aluminum connection that was weeping and am now wondering about other connections simply because I introduced aftermarket parts increasing the number of steel to aluminum connections. So, how are people tightening these? Are these material differences an issue? What's your opinion?
Porsche V8 Fanatic
1990 928 GT - "The Cash GT"
1991 928 GT - "Schrödinger's 928"
Les cons ça ose tout, c'est même à ça qu'on les reconnait!
1990 928 GT - "The Cash GT"
1991 928 GT - "Schrödinger's 928"
Les cons ça ose tout, c'est même à ça qu'on les reconnait!