Vehicle runs and drives real nice, but its been having some fuel system problems I think are caused by heat. The vehicle seems to vapor lock when trying to start the engine when it is warm. Once I relieve the fuel system pressure at the pressure regulator(and getsprayed by amist of hot gasoline andfumes) and prime the fuel pump a few times she fires right up.


how might this fuel line be getting heated up? I've traced the line from the tank to the intake and it is nowhere near the exhaust at any point. No check engine lights, 45+ lbs of fuel pressure, cooling system in good shape. The car has 135k, I was thinking maybe the cat was plugged and the radiant heat was baking the engine compartment???


Not sure anyone care to share their opinion?

 

Vapor lock isn't usually a problem with modern cars having a high pressure fuel pump in the tank.However,I'm not sure what your problem might be. I guess I would suspect the charcoal canister and/or connecting lines.Can you tell us more about the conditions when the problem occurs(location, weather, fuel level, previous driving time/style, etc.)?

 

It does it after a warm engine has sat 15-30 minutes. No way it will fire until the regulator valve is purged. It will do it with any amount of fuel in the tank, any weather condition. I drive a lot of expressway 75-80mph, but the problem has occurred from just driving country backroads.

 

Well, I wish I could say I know the cause. Maybe somebody else here can do so.


If your power is good at 80 mph, I wouldn't think the cat is plugged. If the problem seems to occur in the fuel system, I would first inspect that system. Ask yourself, "Whatcould bedifferent when the engine is hot?" Unfortunately, the OBD II system, which indicates more trouble codes, was not added 'til 1996.


The charcoal vapor recovery canister has been known to fail athigher mileages. While Ican't saydefinitively thatit would cause your problem, it might and would be an easy fix.

 

$00.02

Ive heard of rear Fuel Pumps doing something like this, intermittent.

Did you get to watch the pressure all the time?

Did you verify it is a fuel problem??
Not to deter you from your path but.. odds have been ignition, specifically Crankshaft senor gets hot and quits for 8 minutes or so..

Could be no spark when hot?

Bass

Edited by: bassasasin

 

got it fixed. Some problem in the fuel pump-we changed whatever brand pump was in there and swapped it for a Delco unit. Problem solved thanks for the help.

 

[img]smileys/smiley17.gif[/img]
Great...


Just saw a post where a fuel pump fuse blowing ended up being a shorted coil pack..

Cars are weird sometimes.


Bass

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