HP fuel pump bites the dust
#16
11-02-2018, 07:43 PM
How do you know that? How do they know that? Not being argumentative, just wondering what the real data on this is.
If they are right, and the pump's crankcase is the start of the problem, then within a very few revolutions the top will also be trashed and you won't be able to tell where it started. On the other hand, if I understand the circulation of the fuel, if the fault starts in the top, this is downstream of the bottom end and the bottom will still look good. That means that for trucks in the garage with a trashed CP4, most of them would have a good bottom end but a trashed top end. If accuratediesel is right, most failed CP4 pumps will have both top and bottom trashed. Which is it? In the case of the OP, which was it?
If they are right, and the pump's crankcase is the start of the problem, then within a very few revolutions the top will also be trashed and you won't be able to tell where it started. On the other hand, if I understand the circulation of the fuel, if the fault starts in the top, this is downstream of the bottom end and the bottom will still look good. That means that for trucks in the garage with a trashed CP4, most of them would have a good bottom end but a trashed top end. If accuratediesel is right, most failed CP4 pumps will have both top and bottom trashed. Which is it? In the case of the OP, which was it?
Im basing my comments off CP4.2 diagrams and guys that mod these pumps for a living. One gentleman who has passed away in the last couple of years (Morgan from Midwest) was on the forefront of modding these pumps for more fuel output and these were his beliefs also. Plus, there are different metals in these parts if I'm not mistaken, so whichever metal you have an abundance of was probably the first part to let go.
#17
11-03-2018, 08:00 AM
As I understand it the most common failures are due to poor fuel or water in fuel. With that in mind the failures I would expect to come poor fuel would occur in the bottom end of the pump where the purpose of the fuel is lubrication. Top end failures present as low pressure and are not catastrophic. The kit looks like a good idea to me.
#18
11-03-2018, 09:31 AM
Fuel starvation is another factor. Either thru dirty filters of fuel gelling during cold months.
all no. 2 deisel is poor fuel. The process that removes the sulfur removes the lube value of the fuel and these pumps use fuel as lubrication.
an example of good no. 2 diesel is the stuff you get a Sunoco Stations on the nu turnpike. The pump label says the fuel has 5% bio diesel. The lube value of 5% biodiesel is double of the best after market fuel additive.
all no. 2 deisel is poor fuel. The process that removes the sulfur removes the lube value of the fuel and these pumps use fuel as lubrication.
an example of good no. 2 diesel is the stuff you get a Sunoco Stations on the nu turnpike. The pump label says the fuel has 5% bio diesel. The lube value of 5% biodiesel is double of the best after market fuel additive.
#19
11-03-2018, 02:30 PM
#20
11-03-2018, 06:37 PM
The really appealing product that is on the market to help eliminate pump failures destroying the entire system is the Exergy pump with an improved design of the CP4.2. Has a 25 micron filter in the mprop. It will shut the truck down to prevent system contamination. It also has improved coatings to reduce pump wear from poor cetane rated fuel.
Still wish we could swap to the CP3 like the D/Max guys can.
Still wish we could swap to the CP3 like the D/Max guys can.
#21
11-04-2018, 10:14 AM
The really appealing product that is on the market to help eliminate pump failures destroying the entire system is the Exergy pump with an improved design of the CP4.2. Has a 25 micron filter in the mprop. It will shut the truck down to prevent system contamination. It also has improved coatings to reduce pump wear from poor cetane rated fuel.
Still wish we could swap to the CP3 like the D/Max guys can.
Still wish we could swap to the CP3 like the D/Max guys can.
Here's a page from their catalog and what they offer for the 6.7 PSD.
Check out their site. A lot of information there.
#24
11-05-2018, 12:53 PM
The problem with this idea is they might not give you the full core price if you disassembled it. But I guess if you put it all back together it would probably be ok. Good thought though.
#25
11-05-2018, 12:54 PM
Thanks for posting up. What do you think of these kits? I know the pump will still go, but will this help prevent taking out the injectors?
Also, you have responded in that thread I started about additives and I got trashed about mine. Still using it every tank and going strong with over 33k miles. Always appreciate your input with your time behind the wrenches.
Also, you have responded in that thread I started about additives and I got trashed about mine. Still using it every tank and going strong with over 33k miles. Always appreciate your input with your time behind the wrenches.
I enjoy my job and don't mind posting things that could help someone.
#26
11-06-2018, 08:05 PM
Of course, someone at Bosch or Ford knows the answer. It's too bad that in this day and age of disposability, root cause analysis is a lost art.
#27
11-07-2018, 10:02 AM
It's not technically false, it just only sends the pump lubricating fuel back to the tank. The barrel and plungers that pressurize/pump the fuel fail more often than the crankcase parts. The only place the top end of the pump has to send fuel is the line/rail out to your injectors.
So the kit will prevent fuel system failure from metal being sent into the system via the lubricating fuel. It will not protect your system from the plungers and barrels failing.
#28
11-07-2018, 10:03 AM
#29
11-09-2018, 09:42 AM
Fuel starvation is another factor. Either thru dirty filters of fuel gelling during cold months.
all no. 2 deisel is poor fuel. The process that removes the sulfur removes the lube value of the fuel and these pumps use fuel as lubrication.
an example of good no. 2 diesel is the stuff you get a Sunoco Stations on the nu turnpike. The pump label says the fuel has 5% bio diesel. The lube value of 5% biodiesel is double of the best after market fuel additive.
all no. 2 deisel is poor fuel. The process that removes the sulfur removes the lube value of the fuel and these pumps use fuel as lubrication.
an example of good no. 2 diesel is the stuff you get a Sunoco Stations on the nu turnpike. The pump label says the fuel has 5% bio diesel. The lube value of 5% biodiesel is double of the best after market fuel additive.
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