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Hey guys. I recently got a 68 f100 with the 390 engine. I’m having 2 issues I need help with
1- I got this little heater core hose section ( see picture) missing and I just cannot!!! Get another one in. The room is just too tight and it won’t fit. Any ideas?
2- do I have something going on with my fuel system? Seems like there is no pick up line inside the tank. I got the sending unit and the line that’s threaded next to it (see picture) but I don’t understand how fuel will travel up?
To replace that little chunk of bypass hose, you'll need to pull/remove the water pump.
Inside the gas tank should be a pick up tube with a filter sock on it going down to the bottom of the tank.
thank you for the help. So sorry if it’s a silly question, how fuel gets to the line on top of the tank? It’s basically threaded on the top , does the pick up tube attached to it?
im asking because the threaded line is the one connected to the supply line on the pump. I don’t get how fuel will get in the line if it’s on the top.
Think about sucking on a straw. The straw (pick up tube) goes down to the bottom of the tank, and the fuel pump sucks the fuel out and spits it into the carb.
Think about sucking on a straw. The straw (pick up tube) goes down to the bottom of the tank, and the fuel pump sucks the fuel out and spits it into the carb.
I understand the concept, but how the pick up tube is connected to the fuel pump? That’s my question… because the line from the fuel pump goes to the line that sit on top of the tank and connects to nothing in the tank
Replaced a bunch of those hoses
Use silicone or some grease
Cut a piece of hose that is shorter than the gap, about the size of the bigger hose nipple
You will be able to cram it over the longer nipple and then back the other way onto the shorter nipple
Pull your sender out of the fuel tank?
Blow the sock off? to test
Replaced a bunch of those hoses
Use silicone or some grease
Cut a piece of hose that is shorter than the gap, about the size of the bigger hose nipple
You will be able to cram it over the longer nipple and then back the other way onto the shorter nipple
Pull your sender out of the fuel tank?
Blow the sock off? to test
I will pull it out today. Is the sending unit matters about pulling gas tho?
thank you for the help. So sorry if it’s a silly question, how fuel gets to the line on top of the tank? It’s basically threaded on the top , does the pick up tube attached to it?
im asking because the threaded line is the one connected to the supply line on the pump. I don’t get how fuel will get in the line if it’s on the top.
You might be thinking of how fuel injected cars pump fuel with the pump inside the tank. Your truck's pump is attached to the timing cover of the engine. It is not inside the tank. The tube in your picture extends to the bottom of the fuel tank. As mentioned, it acts like a drinking straw and sucks fuel from the tank. You'll be able to shine a light into the tank and see the dip tube when you replace the sending unit.
You might be thinking of how fuel injected cars pump fuel with the pump inside the tank. Your truck's pump is attached to the timing cover of the engine. It is not inside the tank. The tube in your picture extends to the bottom of the fuel tank. As mentioned, it acts like a drinking straw and sucks fuel from the tank. You'll be able to shine a light into the tank and see the dip tube when you replace the sending unit.
si the pick up tube is sitting directly under the threaded line on the tank?
Can it be I have too little gas to pump? About 2-3 gallons
With that little fuel you truck would have to be setting level. If your fuel pump has lost prime it will take awhile to draw the fuel up. Blow air down the pickup tube on the tank and see if you can hear bubbles. That will tell you if the tube is in the fuel. Since these are non vented tanks, you could pressure the tank and force fuel up the line to the carb. Just break a line loose so you can tell if it's moving fuel.
With that little fuel you truck would have to be setting level. If your fuel pump has lost prime it will take awhile to draw the fuel up. Blow air down the pickup tube on the tank and see if you can hear bubbles. That will tell you if the tube is in the fuel. Since these are non vented tanks, you could pressure the tank and force fuel up the line to the carb. Just break a line loose so you can tell if it's moving fuel.
I’ll try it when I’m back home!
I still don’t understand that tho. The pick up line is threaded on top of the tang, what connects it to the fuel? How fuel reaches to the top
I’ll try it when I’m back home!
I still don’t understand that tho. The pick up line is threaded on top of the tang, what connects it to the fuel? How fuel reaches to the top
...the pickup tube is the one that is inside the tank already. As said above here before, if you shine a light down the filler neck, or the hole where the sending unit goes, you will be able to see the pickup tube inside the tank. To that you attach the line to the threaded connection on the top of the outside of the tank. That line goes to your fuel pump on the side of the engine, which sucks from the bottom of the tank, creating a siphon, allowing for the fuel to be pumped all the way to your carburetor.
