A buddy of mine has a 2000 ford f450 with a 7.3. First the truck was just very low power on hills and when you needed to speed up and black smoke out the exhaust. So first I was thinking air fuel problem. if you baby the truck it will go and drive fine runs nice and smooth no smoke but if you want to speed up or go up a hill it has no power barely wants to get out of it's own way. Threw my scanner on it and watched the readings and saw that when you baby it the icp and ipr seem to work normal goes from 600-2000 psi ipr stays low but when you want to go or speed up the ipr gradually climbs up to 65% and the icp only sees 800 psi at 2000rpm. I know that's way to low and it should be at like 700 at idle. Right now it idles at 450-480 psi. I'm thinking that I have a weak HPOP. Seems like when the ipr is calling for oil and wanting oil it just isn't getting it and when the injectors arnt getting enough oil there dumping fuel. I already lent him a good ipr incase His was sticking or the o ring was messed up and I lent him a good icp just for the heck of it to see if anything changed but nothing did. Has anyone seen this problem before? Everyone says 9-10 times it's not the pump so I just want to see if anyone has any input. And the truck does it not just on hills but flat ground and streets but only when you step on the pedal.

 

Any chance the pump is a reman? I agree it's never the pump, but we sure have seen quite a few reman pumps fail here in the last several months. I'd check the pump for a sticker indicating it might be a rebuilt unit. Since you have a spare IPR and spare ICP, do you have an HPOP you could swap in just to test?

Also be sure there's not a fuel tank restriction causing the low power under load.

 

I'm Almost positive that it is the original pump in it. I don't have a spare pump anymore besides in another truck. And the fuel filter is clean and the oil Is new. The guy maintains the truck well. I don't think it would blow black smoke if it were starving for fuel but I'd have to hook up my gauge to check it out.

 

Unburnt fuel can also come from low pressure causing poor atomization in the cylinder. It's worth hooking up a gauge and watching under load to see what it drops off to. Most of the time restrictions like this will be caused inside the fuel tank.

 

Ok thanks I'll hook up my gauge and see what it has while driving. I know at cranking it should be around 40. What would I want to see while driving?

 

Subcribing

 

You want to see 62 psi at all times I know this is a perfect world number and I have had near perfect operation at 10psi +/-
Jim & fat Monty

 

No power and lots of black smoke could be a boost leak. That's what I would check first. Then check for ICP problems.

 

Welcome to my world. https://www.ford-trucks.com/forums/1...c-low-icp.html

 

Hey so kawcrasher did the hpop solve your problem? Im thinking the pump is gonna solve mine but I'm gonna have to check the pressure from the lpop and fuel pressure and than make a decision but sounds like I have the same problem you had

 

Agreed! check your fuel pressure at cruise. I battled this all the way from MO to WY. Low Fuel pressure WILL cause Black smoke, weird HPOP numbers and low power.

Barney

 

I haven't got one yet, but at this point there is no doubt in my mind it is the problem.

 

So finally got a chance to do a fuel pressure test. I have 68 at idle and reving and I have a constant 64 when it's under a load so. Guess I'm gonna check how much pressure I'm getting from the lpop and see if it checks out. I'm starting to think it's the hpop but not gonna swap it til I know for sure.

 

I have a t500 hpop, 480psi at idle. Ipr is at 11%. I have never seen it go above 48% even when getting on it in my 140 tune. Are u sure the ipr isn't going out? 65% seems really high! I was always told 60 or higher is a bad ipr.
But always learning..

 

So checked the low pressure pump and it was almost at 30 at idle and went up as I brought up the rpms so it's looking like the HPOP just isnt giving enough. Jmudweiser that's what I originally thought ipr too when I originally scanned the truck and drove it I lent him a good icp and ipr that I had that for sure worked and came out of a perfect running truck and no change at all.