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Senior User
Joined: Sep 2010
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From: Fort Knox, Ky
Help
As I have posted before, I needed help with my carb because of the engine lacking power. Well its back and with a vengeance. I have posted in my old thread, but I figured its time to start a new one. This is a link to the old one: https://www.ford-trucks.com/forums/1...carb-help.html. Please help me, this truck is my only vehicle and it is pissing me off that I cant figure out why its doing it.
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Joined: Jan 2007
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This may be a long shot but after reading the posts on your other thread, it looks like most of the normal causes have been addressed. I've run into "lack of power" on a couple of older vehicles that turned out to be clogged exhaust systems. As you approach highway speeds, the engine is simply putting out more exhaust than the system can handle and your power drops off. Try disconnecting the exhause somewhere ahead of the cat/muffler, and take for a quick spin and see if it helps.
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Joined: Nov 2007
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From: Denver Metro Area, CO
Have you checked fuel pressure and output rate of the fuel pump?
You'll need a fuel pressure gauge to check the pressure, I think they're typically combined with vacuum gauges.
For flow rate, a backyard way of checking is to disconnect the fuel inlet at the carb and direct it into a glass bottle or bucket or some such, crank the engine (disconnect the coil so it doesn't start) and see if it looks like it "should be enough."
You'll need a fuel pressure gauge to check the pressure, I think they're typically combined with vacuum gauges.
For flow rate, a backyard way of checking is to disconnect the fuel inlet at the carb and direct it into a glass bottle or bucket or some such, crank the engine (disconnect the coil so it doesn't start) and see if it looks like it "should be enough."
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Senior User
Joined: Sep 2010
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From: Fort Knox, Ky
Ok, how should I know it "it is enough"? Another thing, when I shut the vehicle off, there are tiny air bubbles in the fuel filter, I wonder if that is what could be causing it.
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Joined: Jul 2010
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From: Northeast, OK
Not sure what "a lot of play" means. But, I just replaced a fuel pump on my 351W, and I'm pretty sure yours and mine take the same pump, and both the new pump and the old pump had a bit of play from the resting position. In other words, as you push the arm down it'll go in easily for just a bit and then it hits the pump itself. And, I tried two older pumps I have and they are the same.
As for the bubbles, that isn't a problem. Mine does that at idle but fills up at higher speeds.
As for the bubbles, that isn't a problem. Mine does that at idle but fills up at higher speeds.
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jnye6625
Fuel Injection, Carburetion & Fuel System
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Oct 10, 2004 09:11 PM
