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7.3L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

 
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post #1 of 4 (permalink) Old 10-24-2015, 02:14 PM Thread Starter
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Empty throttle

Hi I am new to all of this but I have a 93 f350 dually non turbo and a little history here I recently had my lift pump go out and I popped an electric one on for about a week to get me around until I could get the proper one the pressure was a little low which I know is not good for the ip from what I understand but I got the right one on and it worked great for a few days but now it's like the throttle is Empty it runs good for about 10 min of driving but then it just won't get out of its own way it idles great but has no balls at all takes about a minute to get up to 40 and won't go much past that I know I am getting good pressure from the lift pump it just shoots fuel out of the sherader valve when I press it at the filter and when I crack loose each injector oine they all seem about even any advice would be great I am thinking either ip or maybe return lines? What would it act like with bad return thanks in advance
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post #2 of 4 (permalink) Old 10-24-2015, 06:44 PM
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Pushing the Schrader valve will verify fuel but it's not an accurate measure of pressure. Take the core out and hook up a pressure gauge, should be 4-6 PSI.


Inspect the fuel line from the frame rail to the lift pump. It may be twisted, kinked or possibly collapsing.

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post #3 of 4 (permalink) Old 10-26-2015, 05:57 PM Thread Starter
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Fuel pressure is a steady 6 pounds and the line looks good from the tank up to the pump I pulled the sending unit and it is clear of any debris any more advice would be much appreciated
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post #4 of 4 (permalink) Old 10-26-2015, 06:08 PM Thread Starter
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Also does the tank selector have any check valves where I shouldn't blow back thru the line or is that ok to do
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