fuel lines newbie questions
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fuel lines newbie questions
Hello again,
So after reading during the whole week about fuel line fitting and all that it still isn<t very clear for me the way i should proceed with this. Your opinions are again much appreciated and needed!
So once again my project is to put a 4.8 Vortec into a 1987 Cadillac brougham which used a carb. From what my GM repair manual says the fuel pressure was about 6 PSI.
I have a tank from a 1996 Fleetwood brougham that I will be using with the stock pump for now. I know in some cases it might work, others it might not be enough. If I have problems I will switch to a Walboro or to a 1999 Silverado pump if it really fits.
1) What is the pressure in the return line? I know it is lower than the one in the feed line which is 50-60 PSI. I was wondering if it's below 10 PSI on the return line so I can get away with a hose and clamp.
2) I am including a pic of the feed pipe to show what kind of flares the stock pipe has. There is a flare on the end and some kind of falre that looks like those used for the GM quick-disconnects. But it is not as big. Are there any connectors or fittings that can fit my fuel pipe without modifications and that can take the 60 PSI? I don<t think so but maybe you guys have some tricks. If not I was thinking of doing a double flare and use regular fuel line screw fittings. I don<t have a AN flaring tool and neither a GM flares hydraulic tool. What is your opinion?
3) I will delete the EVAP stuff from the PCM. Do I need in that case to use a charcoal cansiter and run the line from the sending unit to the canister anyways?
Or do I just plug the line from the sending unit? What did you guys use to plug it?
Here's a pic of my stock charcoal canister. If i were to use it the rubber line comes from the tank and where does the second one go? I am guessing to the EVAP solenoid that is behind the throttle body? Or the line from the tank goes straight to that solenoid. Anyways I removed the solenoid because it was hitting the hood.
Thanks guys for your help
So after reading during the whole week about fuel line fitting and all that it still isn<t very clear for me the way i should proceed with this. Your opinions are again much appreciated and needed!
So once again my project is to put a 4.8 Vortec into a 1987 Cadillac brougham which used a carb. From what my GM repair manual says the fuel pressure was about 6 PSI.
I have a tank from a 1996 Fleetwood brougham that I will be using with the stock pump for now. I know in some cases it might work, others it might not be enough. If I have problems I will switch to a Walboro or to a 1999 Silverado pump if it really fits.
1) What is the pressure in the return line? I know it is lower than the one in the feed line which is 50-60 PSI. I was wondering if it's below 10 PSI on the return line so I can get away with a hose and clamp.
2) I am including a pic of the feed pipe to show what kind of flares the stock pipe has. There is a flare on the end and some kind of falre that looks like those used for the GM quick-disconnects. But it is not as big. Are there any connectors or fittings that can fit my fuel pipe without modifications and that can take the 60 PSI? I don<t think so but maybe you guys have some tricks. If not I was thinking of doing a double flare and use regular fuel line screw fittings. I don<t have a AN flaring tool and neither a GM flares hydraulic tool. What is your opinion?
3) I will delete the EVAP stuff from the PCM. Do I need in that case to use a charcoal cansiter and run the line from the sending unit to the canister anyways?
Or do I just plug the line from the sending unit? What did you guys use to plug it?
Here's a pic of my stock charcoal canister. If i were to use it the rubber line comes from the tank and where does the second one go? I am guessing to the EVAP solenoid that is behind the throttle body? Or the line from the tank goes straight to that solenoid. Anyways I removed the solenoid because it was hitting the hood.
Thanks guys for your help
#2
#1: I don't know what the pressure is, but a hose clamp will hold it no problem.
#2: Not that I know of, but you could always use the fuel injection rated hose and the fuel injection hose clamps. A lot of people will tell you they won't work, but they do. I've been rnning them on another swap of mine for 2+ years with no problems at all. Double flare will also work.
#3: I would junk it if you don't have smog requirements to meet. You may need to vent your tank somehow afterwards though. Hopefully someone else can answer that one.
#2: Not that I know of, but you could always use the fuel injection rated hose and the fuel injection hose clamps. A lot of people will tell you they won't work, but they do. I've been rnning them on another swap of mine for 2+ years with no problems at all. Double flare will also work.
#3: I would junk it if you don't have smog requirements to meet. You may need to vent your tank somehow afterwards though. Hopefully someone else can answer that one.
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Thanks for answering!
I don't have smog requirements to meet so I can junk it. We'll see about venting the tank. Maybe someone else will share their experience.
As for the feed line I think I will use some fittings just for the peace of mind. Otherwise every time I drive the car it will be on the back of my mind. It will probably be a pain to remove the fuel pipe to flare it though. I wanted to avoid doing that if possible.
I don't have smog requirements to meet so I can junk it. We'll see about venting the tank. Maybe someone else will share their experience.
As for the feed line I think I will use some fittings just for the peace of mind. Otherwise every time I drive the car it will be on the back of my mind. It will probably be a pain to remove the fuel pipe to flare it though. I wanted to avoid doing that if possible.