For anyone who has removed the charcoal canister, what did you do with the fuel line that runs to it? I'm trying to track a fuel system problem and I am thinking of all the things that I need to check on. I just have mine capped off, but I think that maybe there is something else that needs to be done with it.

 

Just leave that line open...thats what I did. I know of a few others that also did the same thing.

 

VERY STUPID!!! That line is there to provide a way for gas fumes to vent out of the tank, filter through the coal and out into the atmosphere. Its there so that it can remove any hydrocarbons from the vapors. If you just leave it open you'll have fumes under the hood. Fumes+spark=CABOOOOM!

Trace the line back to were the ventilator cap sits next to that line. Then remove the current rubber hose off the metal line and install a fuel filter on the rubber part and secure it. This will let the system vent and provide a way to keep bugs, dirt, and what not from getting inside the tank.

What fuel system problem are you having??

 

This is the "question" that I sent to Summit Racing...they told me to contact Autometer to see if the sending unit is bad or needs service...I sent it to Autometer and they told me to send them the unit for evaluation, but there was no recall on the part.

I recently installed an Autometer "Phantom" electric fuel pressure gauge...it is the full sweep model from 0 to 100 psi. I am having trouble finding the correct fuel pressure...here is my problem:
I have a TPIS "Miniram II" intake manifold installed on the motor with an adjustable fuel regulator mounted on the fuel rail. I have the stock 22lbs/hr. fuel injectors, with them having about 205,000 miles on them. I also have a Holley in-tank electric fuel pump that is rated at 255lph that is less than 2 years old. The fuel filter was replaced about 6 months ago. The problem I am having is that the fuel pressure is too eratic. When the car is first started the gauge shows around 38 psi., when the gas pedal is pressed down, the pressure drops to around 34 psi...when the gas is to the floor I am getting about 28 to 32 psi...The pressure regulator has a vaccum line going to it, and I thought that when you disconnect it the pressure is supposed to drop around 5 psi., but mine doesn't drop any...and I can't get the pressure to go any further above 38 psi. using the regulator. And even though I don't get any more pressure when I screw the regulator tighter, the car will sometimes hesitate when taking off from a stop and
will almost stall before picking up when you floor it., then the car screams...but all I have to do is loosen up on the regulator a bit and it drives fine. The wiring on the gauge has been checked for correctness...I have considered changing the injectors, but want to be sure that this is part of or the problem. I don't think the pump is bad because it is only 2 years old and is a high volume pump so I would think that I should easily be able to acheive 50 to 60 psi. I am stumped...I have checked the gauge for wiring correctness.

I am going to try another fuel pressure gauge to see if I can get a better reading, but I have done this before but didn't realize that I couldn't get the pressure any higher at the time. I have already taken the Autometer gauge off and will probably sell it anyways because I want a different style...

 

Well, I can't leave the line open, because fuel starts gushing out of the line after a while...I lost about a gallon of gas in my driveway...I have to cap it off...any other suggestions?

 

witch line are you talking about? if i remember right, there are 2, one to the tank and one to the carb

 

Cap it off and get a vented gas cap!

 

That is what I have already!

 

i dunno about you guys, but i have 3 lines going to my fuel tank, two to the manual fuel pump (1 in, 1 return) and one to the charcoal canister. I removed the return line and put a bolt in it (plugged it), and i removed the charcoal cannister and put a cover over it (like for vaccuum lines) and put a hose clamp over that. i've got a vented gas cap and don't have any problems whatsoever.

 

Ok, I ended up plugging the line back up again...I don't have any problems with it then, but I am still having the mysterious fuel pressure problem...that is why all this started. I put a mechanical gauge on the fuel rail to see if my electric gauge was lying to me and the mechanical gauge read 20psi on the fuel pump prime, and then I started the car and got up to 32psi, and then slowly crept up to 34psi where it stayed...I screwed the regulator all the way in and no change...screwed it all the way out and no change...I ended up taking the regulator diaphram apart to make sure everything was in check and everything seemed ok to me. Even when the vaccum line was taken off the regulator there was no change in psi...Anyone else have any ideas?

 

i had a holley pressure regulator that was about the same way. i screwed it in, i screwed it out, the pressure never changed, eventually a friend of mine screwed it down real tight and....bent the diapraghm. i think it's just a crap regulator. i had two gauges hooked up to mine, the damn thing just didn't have any effect on pressure. if i had to do it again, i'd grab a magnaflow or aeromotive and be done with it.

 

i don't know if carbed cars have one. but i think most cars have a pressure relief valve coming from the tank in the rear of the car.. so pressure can't get up too hight..

 

breathment are you talking about the ventilator?? Thats lets air in but not out. It relieves vacuum but not pressure. has a spring in it and a plastic valve that opens under vacuum. Its a black piece with a white cap, usually located on the drivers side rear seat tub on the back side.

 

hmm. well i knew when i got my new one. i was blowing in it, and it let air out if i blew hard enough.. but i thought it was the pressure relieve valve. cause i did some research about my tank expandign and contracting and making poping noises, and everyone told me that it was the pressure relieve valve for when the pressure got to high.. but i might be wrong..

 

Where did you get your vented gas cap?