hello, I need help this trk has been a nightmare. I changed the hpfp and the first pump was bad got a new one now the code is po2291 what can I do I'm having trouble and the local ford dealer is less then helpful.

 

How about a bit of info on your truck such as the year?

 

The trk in question is a 2008 f350 6.4. Came in with po2291 replaced hpfp and injectors. First hpfp had a bad fuel volume control valve so replaced hpfp again now throw in p02291 again.

 

Did you ever find the problem on this P291 code? I'm throwing the same code?

 

no i havent replaced hpfp all injectors and still doesnt run

 

Bummer. The shop that has my truck is going to replace the Injection Control Pressure sensor under the drivers side valve cover and while their in there will look for metal. But, we did not find metal in the main or lift pump filters so I don't anticipate metal in the sensor, (I'm using a FASS lift pump system). This will cost 1200 bucks and if that doesn't fix it I think I will have them replace all fuel system componants since the truck has 80k on it. Another 8k! Hoping its the ICP sensor.

 

hpfp failures usally are due to fuel starvation due to gelling and as a result...pump runs dry and metal glitters the entire fuel system to include the return to tank line which means metal glitter in tank as well.

complete fuel system has to be drained and inspected, all under vavle cover lines replaced, all filters replaced, lift pump flushed out, tank drained and inspected, etc.

if all you did was change the hpfp and injectors...you just sucked metal particles into the new parts from the original parts failure.

if all is done right ...it takes a lot of work to get all the air out of the system....put the key in accesory on psition and if you hear the lift pump spin up...go to the air bleed valve on the fuel cooler and see if you can purge air.

if the inspection and cleaning was not done right...you could be in for an expenseive round 3. even the fuel cooler unit has to be purged clean to clear it of all metal fragments.

 

Speakerfritz,

The first time my engine died on me, it threw codes P2291 and P0087. We targeted inspecting and cleaning the fuel tank and replaced both FASS lift pump filters, and the main HP filter on top of the engine. No metal was found in any of the filters but we found what looked like tiny aluminum metal flakes inside the tank. Some of the flakes actually looked like tiny foil pieces like those found on new fuel octane booster bottles so we caulked it up to me not being careful when I poured booster into my fuel tank! I drove it for a little and it died again showing these same codes! Its been in the shop since, and now they are targeting the ICP sensor, but will also inspect for metal when they break into the fuel system.

Based on your last thread I'm thinking now that what we actually found in my fuel tank was metal flakes possibly from the HPFP grenading on me? Or at least getting ready to grenade! However, what screws this theory up is that as soon as my codes are cleared and we throw all the normal diagnostics on it while its running, we can never get it to fail, and it passes all the pressure tests at idle and under a load. At no time is there any indication that the fuel system is not operating normally. And they haven't been able to get it to fail again even after driving it around. I'm thinking that when they pull the ICP sensor, if we find anything that looks like aluminum tin foil or metal flakes, its time to replace all fuel system components. Including cleaning the fuel tank and flushing all fuel return lines out. What's weird about this one is that we never found one shred of metal flakes in any of the three filters we replaced. And, by the way, I don't believe my issue was due to fuel gelling because all the filters had less than 2k miles on them and no gel was found. However, when I cut open the lift pump main fuel filter, it was very black compared to the other ones. In this case I believe at some point I picked up some bad fuel and it went down hill from there. Your thoughts?

 

Black filters in itself is not a sign of anything....the black is caused by injector blow by and unused rail fuel returns to the tank...causing black filters.

checking the wiring is on the trouble shooting list for this code...has that been done?

The metal flakes should look like glitter. Foil type of flakes is probally foil from additive bottles and they would not get pass Any of the filters.

Check your oil levels for evidence of fuel dilution evident from improperly torqued injector lines and main rail lines...if there is a leak there you will get the code and you will either have fuel in oil if the injector lines are leaking or the injector rail presurre sensor is leaking and in the case of the lines to the fuel rail the leak could wind up on the outside of the engine and appear on the ground as an oil leak as it picks up dirt and sludge or it can leak back into the engine .

send out an oil sample if in doubt .

 

Thanks for the help Speakerfritz. I did ask the shop if they could check the wiring to the sensor before they broke into the engine to change it, but I will need to ask if they actually did it! Do you know if the wiring for this circuit is on a single harness or maybe you have a schematic for which wires you would recommend them to check for this issue?
I have put about 22k miles on my truck since I bought it in 2013 and believe it or not I change oil every 4k miles. Every time I’ve changed it I’ve had Blackstone do an oil analysis and its been fantastic. I did look at my oil level after the first time the engine quit on me and the level was normal, so I believe I’m OK here. And no external leaks either.
I wouldn’t think its possible for a leaky injector or a loose fuel line fitting to cause enough loss of fuel pressure without showing up in my oil ? But maybe a small leak at either of these points could eventually throw these codes without necessarily showing up visually in my oil, but cause enough of a pressure drop to throw up the P2291 code?
Good point on the wiring and I will call them today to see which wires they have checked.

 

so in the begining of this thread you said you had injectors and or HPFP replaced....my concern is that when the replacement happend...madatory replace lines were not and prescribed tourqed procedures not followed..so I am wondering if things were replaced..is there now a leak amoung those fittings and connections.

 

No that was Wbates. I was asking him about his experience and you chimed in with your experience. Sorry for the confusion. I have had nothing changed yet, but we are targeting the ICP sensor first and while in there will see if any metal shows up. which it probably won’t because we found nothing in the filters when they were changed. You ask if they checked wiring which I will confirm but believe they have and found nothing there either. I was asking if you knew the exact wires to chase down but no worries if you don’t. I’m hoping the sensor is bad, but not sure of how often these go out. Otherwise if we have to go back in there I’m thinking that I should just have them replace everything in the fuel system and wanted your thoughts on this? With only 80k miles on my engine I may have a lot of time left on my fuel components. But with these codes it seems that everything I read ends with EXPENSIVE! So am thinking I should just get it all updated and done with. Your thoughts?

 

Yes, sensors, wiring, etc first

if you can clear codes and it runs, most likely just a monitoring or control device.