What does a heui pump do?
Instead of a conventional injection pump, HEUI systems use a high-pressure oil pump. The injection pressure regulator (controlled by the PCM) is responsible for creating injection pressures in a range of 450 to 3,000 psi on 7.3L engines, and 450 to 3,600 psi on 6.0L Power Strokes.
How does a HEUI injector work?
Opposed to the prior single-shot fuel injection design, HEUI systems use an electronically controlled hydraulic activation with a high-pressure oil pump forcing a plunger within the injector to open the needle to fuel spray into the combustion chamber.
How does HEUI injector system affect fuel economy?
Engineers know that if they increase this pressure, they can increase fuel atomization to create a more efficient combustion resulting in higher power and fuel economy. The International 6.9L and 7.3L IDI kept fuel pressure under 2,000 PSI. The HEUI injection system on the 7.3L Powerstroke would pressurize fuel to a max of 21,000 psi.
How to change a HEUI pump on YouTube?
Cat C7, 3126, and C9 – YouTube How To Change a HEUI Pump. Cat C7, 3126, and C9 If playback doesn’t begin shortly, try restarting your device. Videos you watch may be added to the TV’s watch history and influence TV recommendations. To avoid this, cancel and sign in to YouTube on your computer. An error occurred while retrieving sharing information.
When did the HEUI pump come out on the 3400 engine?
On the 3400-series of engines (going back to around the mid-90’s time frame) the HEUI pump was a total pain. These days they are a bit different. Of our equipment which was mostly new in the 2008/9 time frame we have had one HEUI pump failure early doors on a 336D, covered under warranty IIRC, but that’s been it to date.
How often does a cat HEUI pump fail?
I have recently had 2 Cat HEUI pump failures, and was wondering how widespread this problem is. Cat 324D failed at 4000hrs, and D6R series 3 at 4800 and again at 6800hrs, forcing pump and injector replacement.