|
Depending on what you are working on (HPFP, Injectors, etc...) with some planning you can service the HP fuel system without removing the lines.
A year ago I went from LT1 to LT4 HPFP & Injectors, so I replaced the line between the HPFP and distribution block. So when I decided to tear down the engine this winter, I tool my time and pulled everything from the HPFP to injectors off together. Just took my time and didn't put too much pressure on anything as I took it off. Then set it down on a large piece of cardboard and blocked up the HPFP so there was no torque or twist on anything.
I had already upgraded to the LT4 intermediate line, so didn't want to take it apart. FYI - the feed line into the HPFP, you can take that on and off all you want, just make sure when you but it on you use a little lube to make it go on easy.
On the socket / ball connections on the lines, it can be done, but you have to understand how the seal works. The ball will make a indented ring where it meets the tapered face when the fittings are torqued. If separated, the ONLY way it will seal is if that indented ring is perfectly in the same spot it was when originally torqued. When re-assembling, you have to hand tighten the figging a little at a time, while slightly jiggling the line until you feel the two pieces start to align. When in the right spot, the fitting will tighten slightly farther than anywhere else. Then Re-tighten with 3 more Ft Lbs.
My best friend work as a dyno technician at the GM Proving grounds. Says they do it all the time to save time, but will occasionally get a leak (says it usually works once, but not to do it more than once).
Have to understand that the fuel pressure in these lines are so high (3000psi) that you dont have liquid fuel coming out, it comes out in a vapor. EXTREMELY combustable.
|