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Old 02-19-2013, 12:47 PM
buch32 buch32 is offline
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Join Date: Aug 2004
Location: Centeral Ky.
Posts: 127
Quote:
Originally Posted by barry12345 View Post
They just for starters inform you when the fuel filters should be changed out. Also great early warning indicators of things like the lift pump may be failing or some form of obstruction is forming up in the system somewhere. Greatly aid in troubleshooting issues as well.

Running with low fuel pressure reduces milage. Reduces the quality of the engine idle and increases engine noise especially on the highway.

It is my somewhat unproven belief constant low fuel pressure will take the first cylinders rod bearing out over time. Almost for certain on the 616 four cylinder engines. Less certan on the 617 five cylinder engine but still a probability. There are some reasons the 616 engine is more prone to this.

Pressure gauge installed permanently or not. You should at least know where your fuel pressure in the base of the injection pump is. The upside of this is far greater than the downside. It is still fairly safe to say the vast majority of members at this time have no knowledge if they have even adaquate fuel pressure as these engines will still run seemingl decent at very substandard pressures. In my opinion there is a price to be paid for doing so one way or another.

The high milage expert on our site is not talking much. Still i think the fuel pressure he is running at is beyond what I suspect the recommended maximum pressure is. It is only one of a host of modifications he has done.

I am starting to think what he is doing in this area of boosting the fuel pressure higher is safe but still cannot recommend it without certain tests I would have to do.

At about thirty two miles per gallon at fairly high speeds I thought there was no further room for improving his milage. Yet he was getting 35 or more miles per gallon just awhile ago steadily. Drives a thousand miles a week as well back and forth to work and his observations are reliable in my opinion. He also does not vend cars on ebay.

I forgot to mention that good pressure increases power as well. So there is absolutly no downside I can think of to actually knowing you have it.
AFTER I CLEANED THE TANK SCREEN MY PRESSURE WAS STILL BELOW SPEC.
SINCE ADJUSTING THE RELIEF SPRING THE CAR IDLES MUCH BETTER AND HAS MUCH MORE POWER...THANKS AGAIN TO YOU AND DIESEL911
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