Fuel Can
How do fuel injectors attach to an intake manifold?
I am making a custom intake manifold and need to attach fuel injectors. Whenever I have taken apart an injected engine the injectors seem to just be pressed in with a rubber o-ring holding them on. I never understood how this press-on system can stay intact with the high pressures in the fuel lines.
Is the connection at the fuel rail different than the intake manifold connection?
Thanks!
Any related info is appreciated.
The injectors need to be attached. The fuel pressure alone is enough to shoot the injectors out of the fuel rail - at least 40psi, many of the modern return-less systems have a base fuel pressure of 58psi.
There are a few ways this can be accomplished, but in all applications the fuel rail(s) must be bolted down.
A majority of the manifolds have a tapered bore that the business end of the injector sets in, it gets smaller going into the manifold like this: \ / . Others have a straight bore with a stop at the end like this I_ _I . There are a few applications that have a straight bore through to the inside of the manifold, this style needs clips that hold the injector to the rail and the injectors have a pintle cap designed to hold the lower o-ring/seal on the injector.