NinerBikes
Somewhere camping
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Joined: 03/14/2012
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NewsW wrote:The purpose of a return line filter is not to "save" the system, but merely to limit damage (debris in tank and damage to fuel tank / pump / etc.).
If the damage is not excessive (nothing in injectors, etc.) then the repair job will be just flushing the lines and replacement of pump --- and not flushing tank and entire fuel system.
My understanding is injectors are not replaced as part of the repair as of now.
Injectors are replaced on all VW's and Audi's, pretty sure Bosch replaces them on all failures with HPFP, to eliminate contamination issues or a needle valve sticking open caught up with debris, which on a Common rail, would burn a hole through the piston and have a runaway motor.
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NewsW
US
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Joined: 02/06/2012
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NinerBikes wrote:NewsW wrote:The purpose of a return line filter is not to "save" the system, but merely to limit damage (debris in tank and damage to fuel tank / pump / etc.).
If the damage is not excessive (nothing in injectors, etc.) then the repair job will be just flushing the lines and replacement of pump --- and not flushing tank and entire fuel system.
My understanding is injectors are not replaced as part of the repair as of now.
Injectors are replaced on all VW's and Audi's, pretty sure Bosch replaces them on all failures with HPFP, to eliminate contamination issues or a needle valve sticking open caught up with debris, which on a Common rail, would burn a hole through the piston and have a runaway motor.
What is the cost of the repair with the VWs?
@rick
Did they replace all your injectors when the HPFP went?
That begs the question... were the fuel lines (pump to injectors) replaced?
Surely it cannot be perfectly flushed.
I know fuel tank and low pressure lines are not replaced... just flushed.
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stsmark
Northern CA
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News,
Ford's guidance to techs is if the engine is even started post WIF or improper fueling event the entire fuel system is replaced except the LP lines and tank but those must be cleaned.
Mark, Cathy and Zoey (aka The Golden Missle)
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NewsW
US
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stsmark wrote:News,
Ford's guidance to techs is if the engine is even started post WIF or improper fueling event the entire fuel system is replaced except the LP lines and tank but those must be cleaned.
That is very helpful.. thanks.
Then the return line filter is not going to do any good.
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stsmark
Northern CA
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It actually would take 2 filters, one return low pressure from the cam cavity and one on the discharge high pressure.
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NewsW
US
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stsmark wrote:It actually would take 2 filters, one return low pressure from the cam cavity and one on the discharge high pressure.
There is an existing metal filter at the high pressure exit on the pump.
I believe but cannot confirm that there are individual metal filters on individual injectors as well.
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BenK
SF BayArea
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NewsW wrote:stsmark wrote:It actually would take 2 filters, one return low pressure from the cam cavity and one on the discharge high pressure.
There is an existing metal filter at the high pressure exit on the pump.
I believe but cannot confirm that there are individual metal filters on individual injectors as well.
Wonder if they are good enough in particulate size and PSI.
As they load up, wonder if there is enough surface area to continue to
pass without pressure drop and at those PSI's/BAR's...it would become
a balloon quickly if plugged.
$$$$ would factor in the kind/quality/etc of any filter in this type
of system.
Again, impossible to filter debris inside the cam cavity. Married with
very poor lube flow, as it is recycled with little 'fresh' fluid.
Unless the input port and exhaust port are on opposing sides of the cam
cavity
Even then, the basic problem is still there.
Wonder if they had the piston captured like a ICE's crank/rod/pin/piston
would have helped or solved???....but then $$$ becomes an issue...
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NewsW
US
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This is an example of a 30,000psi industrial filter:
http://www.normanfilters.com/30Khighpressureinlinefilters.html
Very expensive, to buy, install, and operate.
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ricatic
Home
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All injectors replaced
Both fuel rails replaced
DCFM replaced
HPFP replaced
Fuel pressure sensors replaced
Ben is correct. The amount of carnage inside the cam cavity is disturbing. There is not one part that does not show damage.
News...Wiebulls early failures were built in what month?
Regards
Ricatic
Debbie and Savannah the Wonderdachsund
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NewsW
US
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rick -- no info on that particular one, but know the first batch of failures were in VINs that were close together.
Notice they did not replace the high pressure lines... why not?
* This post was
edited 05/05/12 07:27am by NewsW *
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