tom.jelly

All 4 of my injectors were leaking from the top O- rings, after taking them out it was easy to see why as the top rings were dried out and cracked. Put new top and bottom o rings, put them back in jumped the fuel pump at the diagnostic connector, no leaks. I crank the car with a weak battery and it doesn't start, now I smell fuel, wtf, and there is a probably 3 tablespoon puddle under the car. push it back in, remove the uim, jump the pump, no leaks from the top, no leaks at the fpr or fpd, I figure maybe the injectors are leaking from the bottom (because of the slow crank/no start) so I stick a mirror down the secondary LIM holes, no leaks, then a borescope even deeper and also into the primaries and jump the pump again, nothing. Where is a logical place for this fuel to be coming from? A year ago I had a torrential fuel leak under the car after it sat for a year plus- which then completely disappeared when I checked everything and was unable to find anything, drove it with no issues a few times but then this year saw the weeping at the top injector O rings so figured that they maybe shrunk because I let it sit and that was the cause last year of the big leak. The car is rarely driven but I plan on driving it more now. The real question is is there anything different that happens when actually cranking the car versus just jumping the fuel pump? Is it possible for the fuel pressure regulator if there is something wrong with it to dump fuel into the hose that goes to its solenoid and then into the intake or overboard? I pulled the air line off of the fpr when jumping the pump and there was no fuel leak, and went over the bottom of the car with a flash light when it was running, no leaks. If for some strange reason hypothetically there was, during testing or cranking while not starting or something, an excess amount of fuel in the intake, is there some way it could end up on the ground without going out the tailpipe?
I'm going to take it out for a short ride (with a huge fire extinguisher!) tomorrow but would really like to figure out what happened there. I can only think that there was some puddled fuel that spilled when I first tried to restart after replacing the O rings....

DaleClark

iTrader: (55)

There is no difference as far as the fuel system is concerned from cranking or not cranking. The only thing I could think of is one of the injectors sticking full open when trying to crank. Or, something like one of the injectors either wired up wrong or something so it's going full open.

If the injector is wide open it will most likely leak out between the intake manifold and engine. Fuel is very thin and will find a way.

Fuel injectors have 2 wires going to them, one is 12v with the key on and the other is "tapped" to ground by the ECU every time it wants the injector to fire. If that "go wire" is grounded out somewhere, when you key on the injector will go full wide open with the key on.

Dale

tom.jelly

I didn't change the injector wiring other than to disconnect and reconnect. I read some forum post somewhere that said the fuel pump jump provided lower than the maximum pressure. I'm guessing there was a combination of fuel from the previous defect and some cranking without firing that was loaded up then leaking out somewhere. I know the injectors were not activated when just jumping the fuel pump because I scoped the injector ends inside the manifold while powering the fuel pump. Still, not a huge confidence builder because if fuel is leaking out of the bottom of the LIM its going right on to the hot exhaust manifold AND would mean a vacuum/boost leak. If it was a large amount I would be more worried about hydraulic lock- in fact I pulled a lower sparkplug from the rear rotor before I removed the UIM the second time because I was thinking of that and it was dry.

tom.jelly

I'm pretty sure i know what the extra fuel was from- when I pulled the injectors all of the fuel inside the rails dumped into the manifold, of course. I didn't consider that. Car runs fine now, no leaks.