I own a 1996, 5 speed, F-350. I believe I am having fuel issues. If I just ease around, no issues. But going down the highway is not an optoion unless I keep it at like 40 mph or less. If I try going 50 mph or more it boggs down. I have to drop it down to 3rd gear and cruise at like 15 mph for a minute, and it will catch up to itself. I can keep in 5th gear and run at 35 mph all day long, no problems. But when I get them rpm's up it won't run but maybe 5-10 seconds before it boggs down again. I pulled the tanks and made sure I didn't have trash or a clogged suction at the strainer. Everything there looked good. I bought a new fuel pump the other day, just want see if anyone else has had a similar issue before I put time and money into something that may not be the problem.

 

You checked the tank suction etc etc.... have you put a new fuel filter in?

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I was having a similar problem. I would just get your truck scanned instead of "beating around the bush" to find your problem. Took my truck to my diesel mechanic and he scanned it and it turns out it was the injectors causing my truck to bog down and causing my truck to go in and out of OD. I also experienced "torque converter chatter" where the truck would "bounce" when the TQ was locked up. I searched and searched on all these forums and I kept having to spend money on my truck and never finding the problem. Like I said I would just get your truck scanned and go from there. Hope this helps!

 

Had a similar problem. There was trash stuck in the fuel lines. Take your lines apart and blow them out.

 

I did change the fuel filter, I don't have a check engine light or any other warning light. I have not blown the lines. I will give that a shot this weekend. Anyone ever changed out one of these fuel pumps without removing the turbo. Looks like the Banjoe Bolt is reachable without removing it to me. I have not done it though. Looks like alot of people say you have remove the turbo. Unless you have to remove the lines that go into the back of the heads. I am trying to avoid that if I end up changing the pump.

 

Can change fuel pump without removing turbo. Have to remove fuel bowl. Lines are a pain to get off but I changed mine out without removing fuel pump

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Without removing turbo I mean

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Throwing parts at a powerstroke can get expensive fast. Before any of that, do soem diagnostics to narrow things down. First check your fuel pressure at the schraeder valve on the FPR at the side of the fuel bowl. Pressure should be above 50 pounds.

If you don't, put a clear hose between the pump and the bowl and watch it while it runs, make sure you have flow and that you are not getting bubbles.

If bubbles, it's usually a cracked pickup... and it will do it below a 1/4 tank of fuel. Reduced flow may be the pickup screen acluded, the fuel pump, a stuck fuel tank selector valve, a stuck open fpr, a block fpr screen, etc.

While you are doing that, check the linkage at the bottom of the turbo turbine housing to insure your EVP valve is opened when warm (EOT above 170*F). One I had, the linkage had come apart and the valve was frozen shut. That will act like a potato closing off your exhaust and give a sort of vacuum cleaner sound to your exhaust.

If you have good pressure and are not getting flow through the injectors, check the Engine oil level and the HPOP oil level. If good... then have it scanned. While being scanned they can check the IPR and ICP readings to see if the HPOP pressure is low/being dumped.

They can also scan the DTC's and have them look at other live data. Some DTC's will not turn on the SEL until they build up the frequency of the code. Some will throw pending codes in the PCM and IDM. Then they can also do a CCT and an Injector Buzz test.

That should keep you busy for a long time. Please post your progress and ask questions.