95 fuel pressure
Thread Starter
Burning Brakes
Joined: Oct 2004
Posts: 801
Likes: 17
From: Middletown Delaware
95 fuel pressure
95 lt1 cylinders and crankcase full of fuel. Drained out 6 gals. of fuel /oil mixture. Removed plugs and drained cylinders. Lubed cylinders and spun engine. Did find FPR bad and also replaced injectors with bosch 3. Fuel pressure will not hold even with wires disconnected from injectors.Fuel still getting into engine. Pressure drops off fast.The only thing that make sense to me is one or more of the new injectors are bad. Will remove plugs tomorrow again and try to determine which injectors may be leaking. I also found vacuum line from charcoal tank to throttle body pluged with charcoal. replaced canister and both purge valve and tank pressure valve after unplugging line. Any other ideas on hoe fuel is getting into engine..
Race Director
Joined: Mar 2015
Posts: 15,926
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95 lt1 cylinders and crankcase full of fuel. Drained out 6 gals. of fuel /oil mixture. Removed plugs and drained cylinders. Lubed cylinders and spun engine. Did find FPR bad and also replaced injectors with bosch 3. Fuel pressure will not hold even with wires disconnected from injectors.Fuel still getting into engine. Pressure drops off fast.The only thing that make sense to me is one or more of the new injectors are bad. Will remove plugs tomorrow again and try to determine which injectors may be leaking. I also found vacuum line from charcoal tank to throttle body pluged with charcoal. replaced canister and both purge valve and tank pressure valve after unplugging line. Any other ideas on hoe fuel is getting into engine..
Le Mans Master
Joined: Oct 2002
Posts: 7,098
Likes: 378
From: Las Vegas - Just stop perpetuating myths please.
Reads like a leaking injector to me also. U can pull the whole fuel rail with injectors and set it up to observe the injectors with the fuel rail charged but engine off.
But ya know the charcoal canister has a solenoid control vlv that pulls vacuum on the canister to purge vapor at above idle rpm (it could stall engine at idle). This could possible be a source also and it reads like your charcoal canister is full of fuel also - need to check that also. Remove the rear tire/wheel and u may have to remove the wheel skirt inside also to access the canister. The whole canister assembly with all the plumbing and check vlvs is less than $100 and after 20 some years the canister is expired (though most owners never bother to replace).
But ya know the charcoal canister has a solenoid control vlv that pulls vacuum on the canister to purge vapor at above idle rpm (it could stall engine at idle). This could possible be a source also and it reads like your charcoal canister is full of fuel also - need to check that also. Remove the rear tire/wheel and u may have to remove the wheel skirt inside also to access the canister. The whole canister assembly with all the plumbing and check vlvs is less than $100 and after 20 some years the canister is expired (though most owners never bother to replace).
Thread Starter
Burning Brakes
Joined: Oct 2004
Posts: 801
Likes: 17
From: Middletown Delaware
I did replace the canister ,purge valve and pressure valve. The FPR is new and has been checked.
Turned out to be a defective injector. Thanks
Turned out to be a defective injector. Thanks
Last edited by Dave Witman; Apr 9, 2015 at 10:50 PM.
