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Power Stroker
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Discussion Starter #1
Just bought a late '99 F350. During a diagnostic drive with a Ford Mechanic, the mechanic pointed out that I had a fuel nock. Said it was probably caused by low fuel pressure, but that it was definately a fuel nock and would not hurt anything. Only does it at low RPMs. Guy purchaced from just put injectors in it a year ago, all the same part #. I have read that #8 was supposed to be different and some say that it doesn't matter. Not sure if nock is related to this. Any one run across this???
 

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aloha, i am having a fuel knock. do you have any other symptoms, like it feels as if it is starving for fuel, or does it only happen around a quarter tank of fuel. this is what mines does and i believe that it has to do with either a clogged pick up tube as well as a possible crack in the tube.
just thought i would give you something to think about :)
 

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Power Stroker
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Discussion Starter #3
Learning a little more, know it is low fuel pressure which seems to be an issue with these engines. Diesel world magazine had some good articles in the August issue. Looking into a Riffraf cross over system, not expensive and seems easy to install. Seems that stock engines are not getting enough fuel to all injectors, even with pump working properly. Will keep you posted has I find out more.
 

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9,392 Posts
depending on mileage on this truck, id want to know my screens in my fuel tank were clean , another known concern with these trucks , as far as the no. 8 injector goes , it doesnt have to have the special injector just for that cylinder , so thats not that big a deal
 

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Power Stroker
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1,030 Posts
Discussion Starter #5
Quieter

Changed #8 injector and it did make it quieter. Can listen to radio now.
 

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Power Stroker
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1,030 Posts
Discussion Starter #6
#8 injector changed, a lot quieter but still has the fuel knock. Installed Riffraff FRx and HPX, can hear fuel knock from out side the truck but not really from the cab. Try tank screens next.
 

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Power Stroker
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1,030 Posts
Discussion Starter #8
Have not pulled tank yet. Did find out that there is a flap on the line above the screen that lets the pump still bick up fuel when the screen gets stopped up. If you get below a quarter tank it picks up air and truck will act like it is out of fuel. When I bought truck I was told not to let it get below 1/4 because it would run out of fuel. Makes it sound like the screen. Have ordered a fuel tank kt from Sinister that does away with the screen and flap. It has an external Baldwin filter. Around $79, found some cheeper but they looked cheep. Will update when I get it installed.
 
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