'99 F250 7.3L PSD Issue- Suggestions

[firefighter9208]

The high pressure oil pump is that rectangular looking think in front of the fuel filter assembly, not the round thing under the fuel filter.

Did you ever visit thedieselstop.com ?



Chris

 

[JD4610]

The high pressure oil pump is that rectangular looking think in front of the fuel filter assembly, not the round thing under the fuel filter.

Uh, no.

That rectangular thing is the high pressure pump RESERVOIR. The HPOP is under the fuel filter housing.

To the OP, as has been stated numerous times by those that have a clue, you likely have a fuel supply issue. Have a mechanic install a fuel pressure gauge at the head and road test with the trailer. If the pressure drops even with a new filter, then either the pump is bad or the sock in the fuel tank is plugged. Both are very common problems. You can blow air backwards through the fuel supply line before the pump to temporarily clear debris from the sock. If it road tests normal after this, then you will need to drop the tank and clean the sock or eliminate it. There are plenty of write ups on the web about this procedure.

Also, the PSD trucks will run without the electric pump operating as they have the ability to siphon fuel from the tank. The trucks will often show a lack of power on a long hard pull but will otherwise run pretty much normal. However, once the system is opened, like when replacing the fuel filter, the system will not prime and the truck will run for a few seconds then quit and not restart. The electric motor section of the pump usually works fine, it is the pump section that fails. So, just because you can hear the fuel pump running doesn't mean it is actually producing useable flow. Something to be wary of as you sort this out.

Don't waste time with the CPS, it cannot cause your concern.


Jay

 

[Ryan03]

The high pressure oil pump is that rectangular looking think in front of the fuel filter assembly, not the round thing under the fuel filter.

Did you ever visit thedieselstop.com ?



Chris

This is a link to an older post that I made right after I replaced a 7.3 high pressure oil pump on a 4700 IH, with pics. http://www.tractorbynet.com/forums/trailers-transportation/167960-ford-super-duty-4.html#post1927892

 

[Highbeam]

Uh, no.

That rectangular thing is the high pressure pump RESERVOIR. The HPOP is under the fuel filter housing.

To the OP, as has been stated numerous times by those that have a clue, you likely have a fuel supply issue. Have a mechanic install a fuel pressure gauge at the head and road test with the trailer. If the pressure drops even with a new filter, then either the pump is bad or the sock in the fuel tank is plugged. Both are very common problems. You can blow air backwards through the fuel supply line before the pump to temporarily clear debris from the sock. If it road tests normal after this, then you will need to drop the tank and clean the sock or eliminate it. There are plenty of write ups on the web about this procedure.

Also, the PSD trucks will run without the electric pump operating as they have the ability to siphon fuel from the tank. The trucks will often show a lack of power on a long hard pull but will otherwise run pretty much normal. However, once the system is opened, like when replacing the fuel filter, the system will not prime and the truck will run for a few seconds then quit and not restart. The electric motor section of the pump usually works fine, it is the pump section that fails. So, just because you can hear the fuel pump running doesn't mean it is actually producing useable flow. Something to be wary of as you sort this out.

Don't waste time with the CPS, it cannot cause your concern.


Jay

Jay's got it right. I am amazed at how many people have responded that do not know what they are talking about. Hard to understand why you would open your mouth when you obviously aren't certain about the facts. It's great that you all want to help but spewing false information is counterproductive.

Only the old powerstrokes had that mechanical lift pump in the valley. The modern 7.3s, the 99 and ups which are the subject of this thread, have replaced this lift pump with an electrical one on the frame rail.

True, the CPS has been recalled and the new grey one has worked very well for me. This has nothing to do with the problem that the OP is having which is lack of adequate fuel supply under load.

 

[flyingcow]

good reading, especially since i am pretty close to picking up a 2000 Ford w/PSD. Not really sure what i learned here, but in my 20yrs of self employed truck driver...............I'm with highbeam. You got fuel delivery problems. As some others point out, change filter first. preferably dump the filter in a clean bucket. Actually i use windshield wash jugs with the top cut off. dump it upside down and let it settle. There will be minor deposits, but look for the water separation. Good Luck. Probably more than just a filter problem. But if you got water in the fuel, and it spoils the injectors? Might get pricey. But the PSD is a tough one.

 

[56FordGuy]

The 7.3 Powerstroke doesn't have a spin on fuel filter. It has a canister type between the heads, at the front of the engine. If you pull the little yellow lever on the passenger's side of the fuel bowl, it'll drain the bowl.