Series 3 Fuel leak
#1
05-20-2018, 01:08 AM
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Series 3 Fuel leak
Hi guys I have a series 3 Sovereign 86 with a fuel leak from the left tank. All of a sudden the engine sounds like it’s running on 2 cylinders barely able to run. If the return solenoid was blocked, would an overpressure situation cause the bad idle? What if both left and right solenoids didn’t open?? All I can see is fuel dripping from beneath the rear of the left wheel arch and car won’t start. Cracked fuel line at rear of rail adjacent number 6 and pressure seems excessively high! Appreciate some help here if possible.
#2
05-20-2018, 05:32 AM
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Hi, I think there are two separate problems. The gasoline leak is one, the engine symptoms is another. Is the fuel leaking through the plug under the tank panel or is it leaking at the inner wheel housing? Remove the tail light lens, then remove the tail light housing screws and pull the housing partly to take a peek at the REAR of the tank to confirm it is not leaking at the SENDER mounting.
Last edited by Jose; 05-20-2018 at 05:47 AM.
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#3
05-20-2018, 06:51 AM
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I agree that you might have two problems
Yes, excessive fuel pressure can cause running problems due to over-fueling.
Normal pressure at the rail is 36 psi which is more than enough to create a big spray if you crack the inlet connection as you've described...so you really need to measure fuel pressure at the fuel rail with a pressure gauge to be sure. The usual method is to remove the fuel supply hose to the cold start injector and attach your gauge to that nipple on the fuel rail.
A faulty pressure regulator can cause high pressure, as can a blockage in the return system
Cheers
DD
If the return solenoid was blocked, would an overpressure situation cause the bad idle? What if both left and right solenoids didn’t open?? All I can see is fuel dripping from beneath the rear of the left wheel arch and car won’t start. Cracked fuel line at rear of rail adjacent number 6 and pressure seems excessively high! Appreciate some help here if possible.
Yes, excessive fuel pressure can cause running problems due to over-fueling.
Normal pressure at the rail is 36 psi which is more than enough to create a big spray if you crack the inlet connection as you've described...so you really need to measure fuel pressure at the fuel rail with a pressure gauge to be sure. The usual method is to remove the fuel supply hose to the cold start injector and attach your gauge to that nipple on the fuel rail.
A faulty pressure regulator can cause high pressure, as can a blockage in the return system
Cheers
DD
#5
05-21-2018, 10:32 AM
Veteran Member
The rear the arch is going to be the sender or perhaps the pipe that crosses over to the trunk.
Pull the air cleaner and with the key on press on the AFM door for a 10-15 seconds. You should hear fuel flow, after a couple of seconds the regulator should make a fairly audible noise as it lets fuel past.
Pull the air cleaner and with the key on press on the AFM door for a 10-15 seconds. You should hear fuel flow, after a couple of seconds the regulator should make a fairly audible noise as it lets fuel past.
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