Ford's answers to the NHTSA 6.7 Investigation
There was a request for a link to Ford's answer's to the NHTSA investigation posted on a previous thread, since closed. Here is the link: Ford's NHTSA Answers to the 6.7 investigation This PDF i...
Forum Discussion
I think we are at a point where preliminary policy recommendations can be made to end users who have experienced a problem.
Since this is a very small set --- and it appeared to have recurred with certain users, it cannot be ruled out that something specific to the users, operating, vehicle equipment involved is responsible.
Recommendations:
1. Damaging limiting retrofit.
A 30 micron or finer filter, sufficient to handle the volume of fuel, should be fitted in the low pressure fuel return line.
The goal is to reduce the ingression of metal particles etc. from a pump failure.
2. Fuel-Water Separator / filter
A fuel water separator ahead of the factory unit in the low pressure could be fitted to give a larger safety margin --- ideally speced to double the factory water separation capacity from abut 7oz in the Ford to at least twice that.
3. Operating changes
Fuel tank should not be run too close to empty, especially under warm / hot weather and when engine is working hard (e.g. heavy towing).
Suggest in summer months, down south, towing, that tank should always be at least 1/3 full.
When stopping after a hot run on a hot day, engine should be allowed to idle for 1 or 2 minutes or more to allow the fuel pump to cool.
Since this is a very small set --- and it appeared to have recurred with certain users, it cannot be ruled out that something specific to the users, operating, vehicle equipment involved is responsible.
Recommendations:
1. Damaging limiting retrofit.
A 30 micron or finer filter, sufficient to handle the volume of fuel, should be fitted in the low pressure fuel return line.
The goal is to reduce the ingression of metal particles etc. from a pump failure.
2. Fuel-Water Separator / filter
A fuel water separator ahead of the factory unit in the low pressure could be fitted to give a larger safety margin --- ideally speced to double the factory water separation capacity from abut 7oz in the Ford to at least twice that.
3. Operating changes
Fuel tank should not be run too close to empty, especially under warm / hot weather and when engine is working hard (e.g. heavy towing).
Suggest in summer months, down south, towing, that tank should always be at least 1/3 full.
When stopping after a hot run on a hot day, engine should be allowed to idle for 1 or 2 minutes or more to allow the fuel pump to cool.
