P1236 Fuel Pump Control out of range... Fuel pump fail? - Ford Powerstroke Diesel Forum
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Old 03-25-2013, 07:33 PM
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P1236 Fuel Pump Control out of range... Fuel pump fail?

Hi everyone.

Truck died last week. Drained water separator, about a liter of fluid came out. Changed filters, then ran fine. Died again Friday, sputtering with zero power. The fuel bowl is not filling up when you turn key now..Just drained water separator again and about another liter came out. It wont start, but I knocked the HFCM with a light blow several times, turned key and it started for about a minute.. but roughhh.


I have code "P1236 Fuel Pump Control out of range"

Does it sound like I had bad fuel and my HFCM went out on me? Because if the fuel bowl won't fill up, wouldn't that be the cause?

My dad thinks that the mesh screen at tank is clogged.

Any Ideas would be appreciative. It is now at shop.
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Old 03-25-2013, 07:35 PM
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Also, I have been running fuel conditioner all winter. This is an on going problem. I have been on the side of the road several times before. Usually when it gets warmer out (like -5C) it acts up. (avg temp has been -20C all winter)

It has usually started once I let motor cool down for 20 min in the past.
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Old 03-27-2013, 09:24 PM
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Anyone have ideas on this?
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Old 03-27-2013, 09:46 PM
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There was a TSB about the liner coming apart in steel tanks and clogging the pick up. Is your tank steel or plastic? Whats the fuel level in the tank. If its below 1/4 tank then the diaphragm in pick up may have fallen out and you're sucking air. These are a couple of possibilities but seeing as how you have a code for the pump, chances are it has taken a dump on you. Don't keep trying to run the truck until you are absolutely sure you do have adequate fuel pressure. Starving the injectors of fuel is a good way to toast em. That being said, any time you service the fuel system, be sure to take your time and bleed the system with several key on key off cycles with some time between each one to allow for trapped air to bleed out
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Old 03-27-2013, 09:49 PM
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It's a plastic tank. And is at 3/4 but was running like crap before at 1/8 tank. My dad said that about the screen.

And ya I tried cranking but resorted to seeing if the fuel bowl itself will fill.
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Old 03-27-2013, 10:15 PM
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Not supposed to run these trucks below 1/4 tank. I know it sounds ridiculous, and if you're like me then your asking yourself, why cant I use my whole tank? Especially at 38 gallons. I've watched my fuel pressure gauge and when it gets below 1/4 tank, it starts to fluctuate big time. Anything under 45 PSI is no good. At 200-300 a pop for injectors, ill just keep it over 1/4 Tank. Heres reference for the diaphram.
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Old 03-28-2013, 12:15 PM
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I found this today, and I dont know if it applies to everyone, but I didnt know these particular screens were in there. Of course ive never dropped my tank so I only assumed there was the screen on the bottom of the pick up...FORD POWERSTROKE DIESEL LACKS POWER ON ACCEL DUE TO FUEL RESTRICTION - YouTube
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Old 03-28-2013, 12:25 PM
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Quote:
Originally Posted by michaelaiman View Post
I found this today, and I dont know if it applies to everyone, but I didnt know these particular screens were in there. Of course ive never dropped my tank so I only assumed there was the screen on the bottom of the pick up...FORD POWERSTROKE DIESEL LACKS POWER ON ACCEL DUE TO FUEL RESTRICTION - YouTube
Thanks for sharing!
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Old 04-01-2013, 09:26 PM
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A little update... It took one hour in the shop. Mechanic said it was the Inertia Switch.

He bypassed it and it starts fine!

I now however have a slight shudder when you rev it to about 1300 rpm and it goes down to idle it misses a little. Maybe Injector damage due to running engine dry twice?!!
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Old 04-02-2013, 05:39 AM
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Inertia switch? No $hit!! Only time Ive ever seen a problem with those is in the older Mustangs where they were mounted in the rear... Slam the hatch or trunk too hard and you're out of business. Oh well... Yeah runnin injectors dry will cause some damage. Maybe a balance test can pinpoint which one it is.
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