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Old 07-05-2009, 03:22 AM
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hpop questions

Just wondering where exactly the hpop is located? Can someone tell me the differences in the hpop from the 7.3 to a 6.0 motor. I am picking up a 99 7.3 dually tomorrow. Nothing is wrong but curious on the hpop. I have a couple friends that have them and they have relatively long crank times to start. Ones an 03 6.0 the other a 99 7.3
thx, the locations are important if different on the 2 motors
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Old 07-05-2009, 09:09 AM
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the pump is mounted to the front cover, just under the fuel bowl.
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Old 07-05-2009, 09:19 AM
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thx but you still lost me. Fuel bowl? meaning fuel filter?
the 6.0 one is under the manifold towards the turbo?
front cover? sorry for the dunb question...
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Old 07-05-2009, 09:21 AM
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yes fuel bowl as in fuel filter. and front cover as in the big aluminum piece on the front of the engine.

7.3 are front gear train engines
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Old 07-05-2009, 09:44 AM
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cool, can you or someone explain to me the hpop process? I am notlookng for more power now. Just want to undestand longer cranking and also how the hpop mixes with the diesel fuel? doesn't it use a bit of engine oil to fore it all? I am a bit more familiar with the common rail. Is the hpop raising pressures of the diesel fuel(stupid question, I know) When itsleaking down how is the long crank happening? i assume building up pressure. The hpop must be a high pressure fuel pump after the one on the frame(lift pump gets it there??
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Old 07-05-2009, 09:52 AM
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look up the heui fuel system on google, it will tell you all about it.
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Old 07-05-2009, 10:07 AM
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i did, i get the fuelpump on the framesending fuel to the higher pressure pump(hpop)
from there it goes to the injectors at real extreme high pressures. This pump is mechanically driven off of gears. We run these trucks on diesel fuel.Where does the oil come in to play here? What i read it actuates the valves in the injector(i think) So from this hpop pump are there seperate lines for fuel and oil? Odviously, we dont run on our engines oil, I also know someoilconsumption here is normal? Why, how does it mix.
I understand low and high pressure pumps, but why does engine oil come into play?
thx
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Old 07-05-2009, 10:13 AM
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HPOP is not a fuel pump. It's the high pressure oil pump.
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Old 07-05-2009, 10:19 AM
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I just read some more, Can I assume that the frame fuel pump,pumps fuel thru the head to the injector and this pump produces high pressure?(if so, how much) Then totally seperate from this, is the hpop which is mechanically driven. This pump, pumps oil to the injector which hydralically opens(fires) the injector?
So fuel itself, never sees the hpop? passage ways in the head flow the fuel? the hpop has its own lines to the injector top for oil?? So if hpop pumps are pumping higher and more does it open the injecter farther and longer(or just one of the above) making more power.
Also that the hpop pressure raises the fuel pressure to the thousands when its forcing it into the cylinder. The large raise in actual fuel pressure is done where? In the injector on its way to the cylinder?

Last edited by melmount; 07-05-2009 at 10:24 AM.
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