Leaking Injectors

[bcrdukes]

Hey folks,

If your injectors are leaking, is it possible to rebuild them or should new ones be purchased?

[JTapper]

Depends on where they're leaking from. If it's the seals, just remove them all and might as well replace all the seals while you're in there. Coat them with a little oil first so they will go in a little easier and won't bind up.

If the injector itself is leaking, it's junk.

[bcrdukes]

So rebuilding them from a place like WitchHunter Performance or Cruz-In Performance is basically useless?

I have a strong feeling my injectors are leaking. It goes from 3bar to 1 bar (if not, just under 1bar) in about 45 minutes to an hour.

[jlevie]

That could be leaking injectors, a leaking FPR, or a worn fuel pump.

Pull the injector rail, jumper the fuel pump, and see if the injectors drip. Any that do will have to replaced. If you have to replace an injector, consider having them cleaned and flow tested. To check to see if the FPR is leaking, pressurize the rail and with the pump off pull the return line from the FPR. If fuel drips out as the pressure drops, the FPR is leaking. If neither of those are the problem, the fuel pump check valve is bad.

Loss of pressure in the rail per se isn't a problem if the pump is in good operating condition. A good pump will pressurize the rail in a turn or two of engine when cranking.

If the pump is bad, check with a flashlight for rust sediment in the tank (a likely case). Rust is highly abrasive and will wear out a new pump in fairly short order. A rusty tank can be acid cleaned and sealed, or replaced. Cleaning and sealing a tank is pretty easy and cheap, as compared to the cost of a new tank. The only hard part is taking off all the stuff that has to be removed to get the tank out.

[Adrian_Visser]

there is a check valve on the outlet side of the fuel pump that can fail and cause the system to not hold pressure, the checkvalve is integral to the fuel pump.

apparently you can install an inline checkvalve from a 5 series in the fuel line

this thread explains it:

http://www.r3vlimited.com/board/showthread.php?t=97245&highlight=fuel+checkvalve&page=2

[bcrdukes]

^
I've done that. It hasn't helped. Fuel pressure goes from 3bar to less than a bar after 1 hour.