New fuel injectors leaking

[Redclayrob]

I just installed new injectors and thought i seated them correctly in the fuel rail as well as torqued the rail down but when the moment of truth came, fuel all over.
It looked to be spraying from the rail side.
Anyone else have this happen? Is there something i should coat the o rings with to help with the initial start up?

 

[bajaphile]

General rule of thumb is to coat the o-rings in fuel prior to installing. Use some fuel or even a light coat of oil so they slide in without getting caught and seat correctly. Chances are one may have just shifted when installing.

 

[ajax1]

I use spit, seat them with. Once in on bottom and top injector should rotate freely if it does not oring is pinched or not seated

 

[george_tlc]

Yep, you likely pinched the rubber gaskets/o-rings during install. I use a smear of dielectric grease on the rubber. Insert into the fuel rail and then slowly/gently line them up from one end and seat into the head. 2 people makes the process easier. I've stuck with toyota OEM new rubber during injector install (kept the rubber that was provided by the injector servicing company as 'spares').

Rotate each injector as you seat it to make sure the rubber is free and not pinched. As you tighten the bolts on the fuel rail, rotate each injector a little to continue to ensure they the rubber is well seated at both ends.

cheers,
george.

 

[GeoRoss]

I did the same as george_tlc, but used petroleum jelly for lube.

 

[Redclayrob]

Yep, you likely pinched the rubber gaskets/o-rings during install. I use a smear of dielectric grease on the rubber. Insert into the fuel rail and then slowly/gently line them up from one end and seat into the head. 2 people makes the process easier. I've stuck with toyota OEM new rubber during injector install (kept the rubber that was provided by the injector servicing company as 'spares').

Rotate each injector as you seat it to make sure the rubber is free and not pinched. As you tighten the bolts on the fuel rail, rotate each injector a little to continue to ensure they the rubber is well seated at both ends.

cheers,
george.

Ok now i have a question about the intake manifold. I had both top and bottom sections powder coated and the ports for the fuel injectors are also coated. The injectors with the boots slid in with no trouble. Do you think I should scrape/sand out the coating on the surface of the ports? I may do more harm then good.

 

[george_tlc]

^ you had the fuel rail powder coated and/or the ports into the head??

I would NOT powder coat any surfaces that needed o-ring/rubber to seal. Look and you will see that the factory surfaces are all machine finished to a polish to ensure perfect seal. I would just buy a new/used fuel rail rather than try to scrape/sand your mistake...

Why the heck did you powder coat any of that stuff? - this is a 4wd, not a show pony

Of course it would have been good to mention this powder coating in your first post...

cheers,
george.

 

[Redclayrob]

^ you had the fuel rail powder coated and/or the ports into the head??

I would NOT powder coat any surfaces that needed o-ring/rubber to seal. Look and you will see that the factory surfaces are all machine finished to a polish to ensure perfect seal. I would just buy a new/used fuel rail rather than try to scrape/sand your mistake...

Why the heck did you powder coat any of that stuff? - this is a 4wd, not a show pony

Of course it would have been good to mention this powder coating in your first post...

cheers,
george.

My bad...i left the fuel rail original but its the lower half of the intake manifold that has the lower ports for the injectors. And the intake and valve cover were so trashed that when i took them off i just had them purdied up a bit.
Am i wrong in the thought that the high pressure side is the fuel rail and the port going into the intake should only have pressure on it when supplying fuel to the chamber? The injectors slid in nicely into the intake ports. I think i went wrong when i didnt insert them into the fuel rail. I just bolted the rail in place hoping the injectors would seat themselves when the rail was torqued down.
So i should seat all the injectors in the rail and then line them up with the intake ports and thread the mounting screws down while making sure all the injectors are alighned and in place and with some movement.
Got to make sure to hold my mouth right as well, lol

 

[george_tlc]

^ yeah, the fuel rail is the high pressure end, the lower intake into the head is low pressure (no direct injection here), so leaking at the fuel rail end is going to be a lot more likely than at the lower intake.

I'd get new o-rings (for the fuel rail side) on hand and replace all just to be safe - it's not work you want to do a 3rd time. Lubricate and rotate and slowly screw down the bolts etc.

cheers,
george.