Gas problem or carb adjust prob?
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Gas problem or carb adjust prob?
Hey guys, I've almost got the truck running, I can run it but only with a spray bottle and gas. Lol It's an 85 f150 302 with a motorcraft 2150 2bbl carb. I think it's an adjustment issue? I started playing with the adjustments and got it to almost start, in fact it did run for about 30 seconds on its own before it stalled out. The carb is fresh off a rebuild... Where do I go from here? Anyone know how many turns the screws should be in or out to start out at? Thanks for all the help I've received from everyone here so far!
Post Fiend
Joined: Apr 2002
Posts: 19,311
Likes: 97
From: Waterloo, Iowa
Make sure carb is being supplied with fuel, not too much, not too little. A mechanical fuel pump needs to supply roughly 1 pint (16 oz) of fuel in 30 seconds under all conditions. (It won't burn this much, hopefully) This is important.
If fuel deliver is too weak or, too high, it will never run right, may start on fire, etc. Everything downstream is predicated on proper fuel delivery to carb. If fuel pump is old, truck sat for 20 years, just replace it.
First though, blow out fuel line with compressed air backfed into fuel tank, maybe 10 or 20 PSI. Then get engine running with a tablespoon or so of fuel into carb and direct fuel line into a clean measured container.
If everything seems OK here are some tips on what to check and carb setup, then proceed with setting the float and idle mixture settings. Let us know how it works out.
http://www.junkyardgenius.com/holley/tune01.html
If fuel deliver is too weak or, too high, it will never run right, may start on fire, etc. Everything downstream is predicated on proper fuel delivery to carb. If fuel pump is old, truck sat for 20 years, just replace it.
First though, blow out fuel line with compressed air backfed into fuel tank, maybe 10 or 20 PSI. Then get engine running with a tablespoon or so of fuel into carb and direct fuel line into a clean measured container.
If everything seems OK here are some tips on what to check and carb setup, then proceed with setting the float and idle mixture settings. Let us know how it works out.
http://www.junkyardgenius.com/holley/tune01.html
pedant
Joined: Jan 2008
Posts: 23,576
Likes: 39
From: EXTREME southwest CT
Leave the gas cap loose when you blow into the tank.
Otherwise the chance exists that you can blow the rollover valve out of the grommet on top of the tank.
Then you will have to either drop the tank or pull the bed off to replace it.
Otherwise the chance exists that you can blow the rollover valve out of the grommet on top of the tank.
Then you will have to either drop the tank or pull the bed off to replace it.
Mountain Pass
Joined: Jul 2010
Posts: 206
Likes: 3
Just an FYI: make sure the fuel supply lines, especially from pump to carb aren't kinked. I replaced mine and bent them myself, and still effed up several bends. It was frustrating to have to keep going back to NAPA to buy another fuel line, but I wanted to be sure I wasn't starving the fuel bowl.
Also, if you look in the fuel bowl and see two colors of gas, that probably means you've got too much crud in your gas tank and it needs replacing. Possibly lines too, although you can blow them out with some sort of cleaner.
Just trying to help. Mine was down for 10 months but it was mostly vac lines I didn't hook up correctly. But I certainly learned a lot of the stuff you are probably learning right now.
Also, if you look in the fuel bowl and see two colors of gas, that probably means you've got too much crud in your gas tank and it needs replacing. Possibly lines too, although you can blow them out with some sort of cleaner.
Just trying to help. Mine was down for 10 months but it was mostly vac lines I didn't hook up correctly. But I certainly learned a lot of the stuff you are probably learning right now.
pedant
Joined: Jan 2008
Posts: 23,576
Likes: 39
From: EXTREME southwest CT
Tank vent check valve that self seals if inverted.
Come on man, lets not be stupid.
I say Kleenex, you ask about facial tissue.....
Come on man, lets not be stupid.
I say Kleenex, you ask about facial tissue.....
Post Fiend
Joined: Apr 2002
Posts: 19,311
Likes: 97
From: Waterloo, Iowa
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Senior User
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Just an FYI: make sure the fuel supply lines, especially from pump to carb aren't kinked. I replaced mine and bent them myself, and still effed up several bends. It was frustrating to have to keep going back to NAPA to buy another fuel line, but I wanted to be sure I wasn't starving the fuel bowl.
Also, if you look in the fuel bowl and see two colors of gas, that probably means you've got too much crud in your gas tank and it needs replacing. Possibly lines too, although you can blow them out with some sort of cleaner.
Just trying to help. Mine was down for 10 months but it was mostly vac lines I didn't hook up correctly. But I certainly learned a lot of the stuff you are probably learning right now.
Also, if you look in the fuel bowl and see two colors of gas, that probably means you've got too much crud in your gas tank and it needs replacing. Possibly lines too, although you can blow them out with some sort of cleaner.
Just trying to help. Mine was down for 10 months but it was mostly vac lines I didn't hook up correctly. But I certainly learned a lot of the stuff you are probably learning right now.
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Thread Starter
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Make sure carb is being supplied with fuel, not too much, not too little. A mechanical fuel pump needs to supply roughly 1 pint (16 oz) of fuel in 30 seconds under all conditions. (It won't burn this much, hopefully) This is important.
If fuel deliver is too weak or, too high, it will never run right, may start on fire, etc. Everything downstream is predicated on proper fuel delivery to carb. If fuel pump is old, truck sat for 20 years, just replace it.
First though, blow out fuel line with compressed air backfed into fuel tank, maybe 10 or 20 PSI. Then get engine running with a tablespoon or so of fuel into carb and direct fuel line into a clean measured container.
If everything seems OK here are some tips on what to check and carb setup, then proceed with setting the float and idle mixture settings. Let us know how it works out.
Holley Tune, Part 1
If fuel deliver is too weak or, too high, it will never run right, may start on fire, etc. Everything downstream is predicated on proper fuel delivery to carb. If fuel pump is old, truck sat for 20 years, just replace it.
First though, blow out fuel line with compressed air backfed into fuel tank, maybe 10 or 20 PSI. Then get engine running with a tablespoon or so of fuel into carb and direct fuel line into a clean measured container.
If everything seems OK here are some tips on what to check and carb setup, then proceed with setting the float and idle mixture settings. Let us know how it works out.
Holley Tune, Part 1
pedant
Joined: Jan 2008
Posts: 23,576
Likes: 39
From: EXTREME southwest CT
My truck is 3/8" supply and 5/16" return.
I don't know about your Autolite carb but most Holley/Motorcraft carb idle mixture screws are good to start at about 1 3/4 turns out.
Then adjust for highest vacuum, set the idle speed and adjust vacuum again until it's right.
I don't know about your Autolite carb but most Holley/Motorcraft carb idle mixture screws are good to start at about 1 3/4 turns out.
Then adjust for highest vacuum, set the idle speed and adjust vacuum again until it's right.
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Senior User
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My truck is 3/8" supply and 5/16" return.
I don't know about your Autolite carb but most Holley/Motorcraft carb idle mixture screws are good to start at about 1 3/4 turns out.
Then adjust for highest vacuum, set the idle speed and adjust vacuum again until it's right.
I don't know about your Autolite carb but most Holley/Motorcraft carb idle mixture screws are good to start at about 1 3/4 turns out.
Then adjust for highest vacuum, set the idle speed and adjust vacuum again until it's right.
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Yeah did all of that but I figured it out.... My sending unit doesn't come anywhere close to the bottom of the tank, think I got the wrong one but, I had made an extension for it useing a section of metal fuel line and a small piece of rubber hose, well I must have used the wrong rubber hose because I have some thats fuel grade and some that's not, because the rubber got eaten alive! This time I made sure to use fuel grade and it's working! Thanks all of you for your help! It was just my own stupidity all along.... Lol
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