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Old 07-25-2009, 06:03 PM
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fuel filters

Is there anything that filters the fuel other than the filter on the motor? My truck has been givving me hell. Today it had no power and out of frustration I threw it in park and put it to the floor for a couple of seconds. It started smoking a little and then covered my yard in smoke and died. Turns out it ran out of fuel. the truck is stock. I'm hoping it has somthing blocking the fuel flow.
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Old 07-25-2009, 06:07 PM
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It sounds like you may be sucking air into the fuel system. I have had a couple 7.3s that were sucking air at the fuel sending unit in the tank and I've had some that have had the sending unit stopped up with debris.
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Old 07-25-2009, 06:11 PM
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how sucking air at sending unit? like cracked pick up?
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Old 07-25-2009, 06:12 PM
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Would lack of fuel cause an injector knock?
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Old 07-25-2009, 07:01 PM
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Yes, a lack of fuel will cause injector knock, cack, cack, cack! smoke and stalling. Fuel pump is located on left frame rail, should be able to hear it when ignition is keyed up. there are two screens located in the pickup assembly. we would Tee into the fuel line with a vaccum gage on the suction side of the pump and look for a value of no more than 5 to 8 inches, any more than this would indicate a restriction, less would indicate a leak, ie sucking air into system. if fuel pump sound gravely, most likely sucking air. if no problem was found there, would Tee into pressure side of pump and hope to see at least 65 psi or better. if you do not have all the tools a quick test after determining fuel pump operation would be to pull filter lid, drain housing and have someone key it up, expect to see fuel rise pretty fast. If fuel pump is not running, check power and ground with a test light, orange wire is power, black is ground. if no power, check relay, jump #30 to #87 in the relay connector, this should power up pump if relay is bad. dont remember FP relay position (shame on me)but look in owners manual. if relay is bad, exchange the ABS relay into that position, dont need no stinking ABS.. these checks will save you many hours of possible labor, or trailer it up to Clackamas and we'll fix it for you, hehe. Hope this helps, and I hope we're talking about a 99, 02 7.3, lol!
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Old 07-25-2009, 08:48 PM
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Thanks guys. It's an '01. And what it does is most of the time it will start making a knocking sound. But sometimes it will start knocking and then just lose all it's power and sound like she is only hitting on half the cylinders. I changed the fuel filter and fired it up and it sounded like hell so i reved it up a few times and it cleaned up.seems fine now. but it's too good to be true for a filter to fix it. We'll see when i crank it up tomorrow and drive around the ranch...
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Old 07-26-2009, 01:28 PM
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i'm about to launch this thing off a cliff as it's burning and i'm going to shoot it full of holes as it falls.
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