help! - fuel system
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help! - fuel system
I have a 68 F-100. It won't start. At first, if I poured gas in the carb and would run for a while. After I got it running it missed a little so I changed the fuel filter. After changing the filter it will not start. If I pour gas in the carb it will only burn out that gas and die. Any ideas?
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From: Houston TX
Carb. Filter. Fuel pump, many including a screw on filter. Fuel line to tank including rubber hoses. Tank, including any strainers. You've done the carb and filter thing, so fuel pump, including built in filter is the next step. See if gas going out. If so, measure the output to see if it's up to normal specs. If not, see if fuel is making it to the pump from the tank. MK
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From: Bearspaw (near Calgary)
soutahranger, do a search. This seems to be a really common problem and there have been numerous threads lately on it. Proper diagnosis would require more info. Was it running good and then gradually went bad or did you just buy the truck and you've never been able to get it to run? Was the truck sitting for a long time? The list of potential problems is really, really long and everyone on this forum has watched a number of souls struggle vainly. One word of advice, do not touch that carb until you've eliminated every other problem. I had a similiar problem and it turned out to be a really fine rust/sludge sediment in the bottom of my tank.
Last edited by rrawlins; Nov 22, 2003 at 07:34 AM.
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Thanks for the advice. A little more info. This was my dad's truck. He bought it new in '68. He just gave it to me a few weeks ago. The truck has been sitting with very little use for about 2-3 years. I went through a tank of old bad gas and have gone through a tank of new gas. It was running fine on the new gas and all of the sudden, one morning, it would not start. After adding gas to the carb it started and ran without problem, but after it sat for a while it would not start again. I have changed the fuel filter. My dad ran compressed air through the fuel line to clean it out as he was having a similar problem. The pump seems to be working as when I get it started it will run fine. So, the problem is mainly on starting.
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From: Denver
I see this kind of problem on a lot of the old jeeps I work on. I would check the diaphram at the point were the pedel linkage meets the carb, I cant think of the name off hand, but if that diaphram is cracked you will have these problems. Also you should see gas leaking. Hope that helps.
Robert
72 Ranger XLT W/ 86 5.0L EFI W/ AOD
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Robert
72 Ranger XLT W/ 86 5.0L EFI W/ AOD
www.geocities.com/krazdndenver
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From: Bearspaw (near Calgary)
When you say "when I get it started it will run fine" do you mean it'll "run fine" or it'll "drive fine"? and krazdndenver are you referring to the accelerator pump? And to clarify, when I said don't touch that carb I meant don't start adjusting it. If you have a "known good" carb go ahead and replace it. That is a fast and effective way to eliminate a bad carb. But make sure it is a known good carb. I had a shop give me carb that they said was 100%. I put it on and still had problems. So I spent a week and about $300 fixing everything else I could think of. Turns out their carb was bad too. My original problem was that I had a bad fuel pump that caused the carb accelerator pump to go. Sigh, that was a long and frustrating lesson.
Last edited by rrawlins; Nov 22, 2003 at 10:46 AM.
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It will "run fine" and drive not too bad. I am noticing a little bit of a miss when coasting, but not problems during acceleration.
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Laughing Gas
Joined: Jun 2003
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From: Parkville, MO (KC)
I would still guess its the fuel pump or a plugged filter. When the engine is running at higher RPM, a failing fuel pump will still get enough gas out. Till it finally can't even do that.
Do you have a filter in the line, right before the carb? Do you have a Carter YF or an Autolite 1101? Carter's came with the inline filter I think. My Autolite doesn't have one. Anyhow, replace it, as well as the fuel pump. At 35 years, the diaphram cannot have much life left, and at $20 at Advance, how can you go wrong.
Do you have a filter in the line, right before the carb? Do you have a Carter YF or an Autolite 1101? Carter's came with the inline filter I think. My Autolite doesn't have one. Anyhow, replace it, as well as the fuel pump. At 35 years, the diaphram cannot have much life left, and at $20 at Advance, how can you go wrong.
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From: Bearspaw (near Calgary)
I'm siding with cdherman on this one. I found out it was my fuel tank by unhooking the fuel line into the tank and gently blowing some compressed air into it. But watch out cause when the tank unplugs it starts to flow fast! That worked for about 30 miles then it plugged up again so I've got to get my tank steam cleaned. Of course then you have to blow out all your lines and replaced the inline barrel filter and carb filter.
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From: KC
I had the exact same problem with my 67 w/ a 352 when I bought it, at first I thought it was just a little rusty cause it hadn't been started, after that i replaced the fuel pump, it still didn't fix it, so i replaced the carb and it worked fine. I got a rebuilt holley for around a 100 dollars. But then a week later I decided to do a complete overhaul and pulled the motor, but it fixed the problem with the new carb
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I have the autolute carb. I replaced the canister filter on the fuel pump. Still having problem. It is really strange. The truck starts fine if it has been sitting a while. Also, if I run it for a few minutes, it will start right back up. However, if I run it, then shut it down for half hour to one hour, it doesn't want to start again no matter how much I crank.
Laughing Gas
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From: Parkville, MO (KC)
Check your lines back to the fuel tank for leaks. If they have a leak that allows air to enter the line, the gas will flow back into the tank. This is esspecially the case if the fitting at the top of the tank is a little loose. And replace the fuel pump.
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