Fuel issues
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Joined: Aug 2004
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From: IL.
Fuel issues
I have a 1978 f-150, has been sitting for a little while, tried to start cranks good but not getting fuel at carb figured the fuel pump was shot replaced it went to crank it up for some odd reason still no fuel, pump was installed correctly was wondering could there be a issue in the gas tank or possibly the lines ?? Thanks
Moderator & parts slinger
Joined: Feb 2007
Posts: 50,246
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From: S/W Missouri, Polk county
Setting a while meaning days, weeks, months, years..? Sometimes when they set the fuel can back drain from the carb and lines and that can make for a hard to start issue. Did you prime the fuel bowl on the carb, and then try? PUT THE AIR FILTER COVER BACK ON BEFORE YOU CRANK IT!
1. Our of gas? No matter what the gauge says, did you tap on the bottom of the tank to tell? Add 5 gal to check that box.
2. Your sending unit pick up tube filter sock could be clogged. Take the rubber line off the IN port of the fuel pump (where is goes BACK towards the tank) and put some LOW pressure compressed air (think air compressor with spray nozzle) and give it a little air pressure. Tank full of gas, you should hear bubbles.
3. Setting for a while can cause a rubber fuel line to crack and then is will suck air when trying to start and not always leak fuel. Insp rubber lines.
4. Any inline fuel filters? Replace. What about the one at the carb if it is OEM set up. The one that threads into the body of the carb.
5. Do you still have the hard metal line from the out port of the pump to the carb? Disconnect each end and put some air thru it to make sure it is not clogged.
1. Our of gas? No matter what the gauge says, did you tap on the bottom of the tank to tell? Add 5 gal to check that box.
2. Your sending unit pick up tube filter sock could be clogged. Take the rubber line off the IN port of the fuel pump (where is goes BACK towards the tank) and put some LOW pressure compressed air (think air compressor with spray nozzle) and give it a little air pressure. Tank full of gas, you should hear bubbles.
3. Setting for a while can cause a rubber fuel line to crack and then is will suck air when trying to start and not always leak fuel. Insp rubber lines.
4. Any inline fuel filters? Replace. What about the one at the carb if it is OEM set up. The one that threads into the body of the carb.
5. Do you still have the hard metal line from the out port of the pump to the carb? Disconnect each end and put some air thru it to make sure it is not clogged.
FTE Legend
Joined: Nov 2015
Posts: 30,935
Likes: 4,123
From: Angier, NC
The lines from the carb can drain back but if the check valve in the pump are any good it should not.
There is NO WAY the carb can drain the float bowl back to the lines as where the fuel comes in is at the top of the bowl.
Now the fuel in the bowl can AND DOSE evaporate with today's fuel and if the truck sits a week or more you have to crank and pump the throttle a lot before it will start.
If my 300 dose not start after sitting a week or more with 1 pump to set the choke I start pumping like crazy while cranking and as soon at it catches I stop pumping. If the motor is run every day or 2 it will fire up with half pump to set choke.
So sitting a week or more just keep cranking and pumping and it will pull fuel and start. Just let the starter rest after say 20 seconds of cranking to cool off.
If you dont like cranking it a lot, little gas down carb or starting fluid should work.
Dave ----
There is NO WAY the carb can drain the float bowl back to the lines as where the fuel comes in is at the top of the bowl.
Now the fuel in the bowl can AND DOSE evaporate with today's fuel and if the truck sits a week or more you have to crank and pump the throttle a lot before it will start.
If my 300 dose not start after sitting a week or more with 1 pump to set the choke I start pumping like crazy while cranking and as soon at it catches I stop pumping. If the motor is run every day or 2 it will fire up with half pump to set choke.
So sitting a week or more just keep cranking and pumping and it will pull fuel and start. Just let the starter rest after say 20 seconds of cranking to cool off.
If you dont like cranking it a lot, little gas down carb or starting fluid should work.
Dave ----
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