Fuel flow?
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New User
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Fuel flow?
Just replaced fuel pump on my 75 150 w/460 truck ran great for a mile or so then sputtered and died. I pulled the fuel line to carb and no fuel getting there. Could there be trash in the tank causing a blockage? Like I said it ran great for a mile or so. So what gives???
Moderator & parts slinger
Joined: Feb 2007
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From: S/W Missouri, Polk county
Could be a clogged intake sock on the sending unit? Put some low pressure air in the line where it connects to the pump and back flush it.
If it is the sock being covered with "stuff" this will only be a temporary fix. Or a junk brand new china made pump?
If it is the sock being covered with "stuff" this will only be a temporary fix. Or a junk brand new china made pump?
MSEE
Joined: Apr 2004
Posts: 10,386
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From: Austin, TX
Spot on - there are up to two short lengths of rubber fuel hose along the length of the fuel line back to the tank; if they deteriorate, they will draw in air and you will lose siphon.
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Fuel flow
Just pulled tank...that sux...3/8" lines are rotted as well as filler tube and vent...sock on inlet is black and clogged. No visible rust but fuel looks like lake water. Drained it into a 5 gal bucket through pantyhose and there is a lot of black debris. I will replace all the rubber and get a new sending unit, never flushed a tank any suggestions?
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
With that much garbage in it, I would probably have a radiator shop flush it for you - it wouldn't hurt to call around; I can't imagine it would cost much.
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Thread Starter
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Fuel Flow?
New pump, lines, sending unit and tank flushed. Runs great for a mile or so and dies. NO FUEL DELIVERY TO CARB. The last thing I can think of is pump cam. But wouldn't that be all the time and not after a short run? I have pulled line at carb and NO FUEL! Anyone, any ideas???
Cranky Old Guy
Joined: Mar 2008
Posts: 3,562
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From: Raphine, Virginia
Pull the gas cap off and see what happens. If vents are clogged it creates a vacuum on tank not allowing it to draw fuel. Would explain why it run long enough for vacuum to build up.
Moderator & parts slinger
Joined: Feb 2007
Posts: 50,102
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From: S/W Missouri, Polk county
Is there alot of under hood heat, meaning an excessive amount? Are you running headers? Might be a vapor lock caused by to much eng compartment heat.
I am currently battling that issue on my EB. And yes make sure you have a vented fuel filler cap.
Maybe install an elec pump back by the tank? Did you test the mechanical fuel pump (turn it over with the line going to the carb disconnected) and get a pretty good flow outa it?
After your mile or so test drive what did you do to get it to start, if you did? Wait 10 min and it started, prime the carb directly, or just tow if back home and get on here?
I am currently battling that issue on my EB. And yes make sure you have a vented fuel filler cap.
Maybe install an elec pump back by the tank? Did you test the mechanical fuel pump (turn it over with the line going to the carb disconnected) and get a pretty good flow outa it?
After your mile or so test drive what did you do to get it to start, if you did? Wait 10 min and it started, prime the carb directly, or just tow if back home and get on here?
Moderator & parts slinger
Joined: Feb 2007
Posts: 50,102
Likes: 5,759
From: S/W Missouri, Polk county
I am sure but am going to ask, fuel pump arm under cam? I hope its a simple bad new fuel pump.
If its the eccentric, its either a tear down of the front half to get access to it or just add elec pump and be done?
If its the eccentric, its either a tear down of the front half to get access to it or just add elec pump and be done?
