I’ve got an 04 f250 5.4 4x4. I was plowing in February and the front driveshaft broke. I towed it up my driveway because it couldn’t make it in 2 wheel. It was driving and idling fine but after a couple of minutes stalled out. Gauge showed 0 fuel pressure. Pump fuse was blown. Replaced it still no pressure. Replaced pump now had 38-40 psi. It started but was running rough with a lot of white smoke. I pulled the fuel injectors out and the 2nd one back on pass side the manifold was filled to the top with fuel. Thinking the new pump had better pressure and the old injector couldn’t take it. Blew out each injector hole and replaced every fuel injector. The plugs were pretty bad so I replaced them and also the coil packs. Still blowing white smoke and running rough. After starting a couple of times the engine locked. Checked oil level and had gas smell and at least a quart over. Changed oil and pulled plugs. Blew out cylinders with compressed air.put back together, still ran rough, still white smoke. The fuel pressure might go down 2-3 psi in an hour, so don’t think injectors were leaking. Figured the Amazon injectors weren’t good so I bought a better set, put them in, no white smoke but still ran rough, but better than before. Ran it twice for maybe 3-4 minutes each time. Came back an hour later and the engine hydro locked trying to start it. Oil level hasn’t gone up this time. Any advice would be appreciated.
Thanks in advance

 

The white smoke is a clue of coolant getting into the combustion chamber.

The problem after problem might be from incorrect diagnosis. What you might consider would be to look for the spark plug with the very white coating..

We don't know at this time if it is only a bad head gasket or some other way for coolant to get into the combustion chamber.

If you removed all the spark plugs, let it sit overnight , then crank the engine over and watch for the cyl shooting out coolant. Once that is known you can proceed to compression test and the low compression should reveal bad cyl with problem..

 

I’ll give it a shot

 

I just checked the antifreeze level and it hasn’t gone down and when I chAnged oil it was mixed with gasoline, but not milky. Do you still think it could be a head gasket?

 

The gasoline should not be getting in the oil.
One way that can happen is if an injector is leaking down when the engine is shutdown.
The color of the plug(s) can tell you a lot ,like black when it should be gray.

Did you actually remove the radiator cap and check the radiator or are you going by the level in the overflow bottle ?

Sounds like more than one problem.

 

Going by the overflow bottle. There is no radiator cap. Just the radiator hose. Was thinking of taking plugs out one at a time then trying to turn crank with breaker bar to see if one cylinder is the problem. And stuffing some wadded up paper down the plug well(the brown paper they use for packaging) so I can see if it’s fuel or antifreeze in the cylinder. Thanks for the input, it’s helping me with my diagnostic plan.

 

Happy Easter to everyone!

 

You too!

 

I started taking out plugs one at a time starting with the front. After each plug I would try and turn the crank to see which cylinder was hydrostatically locked. When I got to Dr. Side rear it turned right over and had a bit of fuel in the cylinder. I had disconnected the fuel rail to make it easier to remove the plugs.
Next day the engine was hydro locked again. I still had pass side rear plug in. Took it out and turned engine over maybe half a turn and gasoline was pouring down the rear of the engine. Must have been a cup or 2. It came from driv. Side rear cylinder. I still had fuel injectors in manifold but the fuel rail was off so depressurized since the previous day. I had stuffed paper into each spark plug well to check for gas and none except for 2 rear cylinders. The truck is parked on an incline with the front of truck facing up. I’m thinking somehow fuel is getting into manifold from other than injectors. I didn’t notice any fuel when I pulled vacuum hose off of pressure regulator. Not sure what to do next. Any thoughts would be appreciated.

 

There are some questions,,,,,,,,,,,,,,,,,,,,, When the driveshaft broke , did it hit anything under the vehicle?

Could there be water in the fuel tank? That could have destroyed the original fuel pump !
That "stuff" that comes out and smells like gasoline,,, could that be mixed with water ? Guess where the water could go in the fuel rail, engine uphill , to last injectors at firewall. As you know , injectors don't like water and can seize .Maybe just my crazy thoughts, but have seen where lots of unnecessary work was done because when fuel was purchased,they bought a load of water..

One way to find out, will that light up and burn if you put a match to it ?