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Upgrades and Aftermarket - 99 & up 7.3L Engine Upgrading or adding OEM or aftermarket equipment to your 1999-Up Super Duty or Excursion with 7.3L Power Stroke diesel engine. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 01-25-2013, 09:43 PM   #1 (permalink)
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NEW FPR

I have a magnafuel fpr 9925 installed on my truck with a isspro ev2 gauge on it. I can't seem to get this up to 55-65 lbs. I have tried to adjust it but it doesn't seem to move higher. Any ideas on why this is happening with an adjustable fpr?
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Old 01-25-2013, 09:49 PM   #2 (permalink)
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Could be a weak or failing fuel pump or a restriction in the fuel tank. That's assuming the FPR is working. Can you block the return line for a test?
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Old 01-26-2013, 01:13 PM   #3 (permalink)
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What kind of test? Or are you saying blocking the return line is the test?
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Old 01-26-2013, 01:38 PM   #4 (permalink)
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Re: NEW FPR

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What kind of test? Or are you saying blocking the return line is the test?
I believe that is what he is saying. Blocking the return line and you will see if the fuel pump is capable of going higher than your current readings. Could be trash in the FPR or weak spring.

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Old 01-26-2013, 02:28 PM   #5 (permalink)
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Exactly. If your pump can only put out 30 psi, you can mess with the regulator all day and not get anywhere.


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Old 01-29-2013, 10:00 AM   #6 (permalink)
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Just an update on the system and test.

I have the return line Tee'd into the fuel line behind the pump. I originally blocked the return line at the start of the FPR and the pressure dropped to 30. I then blocked it below the FPR and the part where it Tee's into the fuel line before the pump. The pressure rose, but held at 45ish.

Does that indicated the fuel pump is done or should I do something else to be sure?
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Old 01-30-2013, 08:06 AM   #7 (permalink)
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I used an adjustable raptor pump that I had lying around and I noticed on the electric pressure gauge that the gauge immediately shot up to 55 psi. The stock pump I had on it incrementally rises to the above stated 45-50 psi. Is that another tell-tale sign the pump is bad?
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Old 01-30-2013, 08:55 AM   #8 (permalink)
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Yep. It's either toast or drawing air. How much fuel in the tank?


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Old 01-30-2013, 10:08 AM   #9 (permalink)
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The tank is half full. Unless it is drawing air from the lines, but I vacuum tested them all when I installed them. It isn't air from the tank. I purchased a new Bosch for 84$ shipped.
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