Why would the return line cause it to lose fuel when you open the throttle?
If the purpose of the return line is to return unused fuel to the tank,
theoretically there is less fuel passing through it as you open the throttle
up.
Scout

"Bart Senior" wrote in message
et...
It didn't run at all until I changed the filters and bleed the
system.

I'll bet it's either the fuel pump or else the return line. Either
of those fits the circumstances.

"Scott Vernon" wrote

Did it run OK after you changed filters. Air leak?

"Bart Senior" wrote
All filters are new.

"Scout" wrote

check your fuel filter.

Scout wrote:
Why would the return line cause it to lose fuel when you open the throttle?
If the purpose of the return line is to return unused fuel to the tank,
theoretically there is less fuel passing through it as you open the throttle
up.

Not necessarily. With a Detroit, yes, but other types of injector
systems do it differently. With our diesel (Ford Lehman) for example
there is almost no return at idle, the return flow seems to be
proportional to throttle setting (although it jumps when the load changes).

A blocked return line could cause the engine to die but it would be more
likely to surge or be unresponsive to throttle first (disclaimer- I am
not an expert diesel mechanic and never played one on TV)

Your advice about checking the filter again even though its new is right
on. Say Bart do you have a vacuum gage on the filter outlet?

Fresh Breezes- Doug King

Bart Senior wrote:
I don't think I've met a Southerner that was stupid and
mean. I have to admit as a group, they rate about the
best in the US.

Thanks. I am a Southerner and am proud of it. Cultural differences are
being erased in this country, partly because of mass media and partly
because of everybody moving around so much.

There certainly are mean-spirited and/or stupid and/or dishonest
Sotherners, just like among any other people... we try to weed them out
early though Some cultural anthropologists studying the matter have
identified a number of characteristics of Southerners, the main two are
generosity and sense of honor. This doesn't necessarily mean that
Southerners are more honest or have better families, just that we get
PO'd if you insult them!

Speaking of which, this guy is a hoot... genuine PhD and Southerner...
used to write a column for the local paper until it was bought up by a
Yankee franchise...
http://xroads.virginia.edu/~DRBR/REED/tears.html


DSK

Scout wrote:
that's because so many Yankees have migrated South.

It certainly explains the traffic problems. And why so many restaurants
have given up serving sweet tea.

DSK

Bart Senior wrote:
Hmm, I was thinking about going to hard lines!

There are a couple of benefits: greater flow is one, more compact, more
resistance to various kinds of stress, less prone to leakage in places
other than fittings... the down side is that they're more difficult to
fit, and you can't pull them out of the way to work on something else.
Over years, the hard copper pipe will work-harden with vibration and
become impossible to keep tight. The copper pipe I put in is mounted so
that (hopefully) the vibration will be minimum.


I'd like to have a fuel scrubbing system.

Me too... it's on the list, along with many other upgrades

... Have you seen these fuel
monitoring systems that measure fuel flow and fuel return to track
fuel usage.

Yep... a lot of control systems we work on have some fancy fuel flow &
fuel consumtion/efficiency packages.

... I read about them a few months back and I'd like to
find out more about them.

In industry, Siemens and ITT are about the best IMHO. For boats the
FloScan is popular and seems practical. I know a number of trawler
owners with these

http://www.floscan.com/html/index.asp

... I don't want to be wondering how much
fuel I have.

You'd need a flow meter hooked up to a totalizer. Really, that seems
like overkill for our boats. A good reliable tank level gage should be
fine... most are cheap junk, like the ones in cars... better than
nothing though!

Fresh Breezes- Doug King

"DSK" wrote in message
.. .
Scout wrote:
that's because so many Yankees have migrated South.

It certainly explains the traffic problems. And why so many
restaurants
have given up serving sweet tea.

Every truckstop across the country serves sweet tea, hon.

SV

Scott Vernon wrote:
Every truckstop across the country serves sweet tea, hon.

Dunno about truck stops, but most Waffle Houses do!

DSK

"Bart Senior" wrote ...
It didn't run at all until I changed the filters and bleed the
system.

Because the filters were clogged, or you had air in the system?
If the filters were clogged, the new one may have restriction already.
Did you inspect the rubber gasket? Do you have 2 fuel filters?

SV










I'll bet it's either the fuel pump or else the return line. Either
of those fits the circumstances.

"Scott Vernon" wrote

Did it run OK after you changed filters. Air leak?

"Bart Senior" wrote
All filters are new.

"Scout" wrote

check your fuel filter.

Mmmmmmmm pecan waffles......


"DSK" wrote in message
.. .
Scott Vernon wrote:
Every truckstop across the country serves sweet tea, hon.

Dunno about truck stops, but most Waffle Houses do!

DSK

Good points Doug.
Also, in many of the fuel pumps I've worked with, a severely restricted
return line will blow the pump seal.
Scout

"DSK" wrote in message
news
Scout wrote:
Why would the return line cause it to lose fuel when you open the
throttle?
If the purpose of the return line is to return unused fuel to the tank,
theoretically there is less fuel passing through it as you open the
throttle
up.

Not necessarily. With a Detroit, yes, but other types of injector
systems do it differently. With our diesel (Ford Lehman) for example
there is almost no return at idle, the return flow seems to be
proportional to throttle setting (although it jumps when the load
changes).

A blocked return line could cause the engine to die but it would be more
likely to surge or be unresponsive to throttle first (disclaimer- I am
not an expert diesel mechanic and never played one on TV)

Your advice about checking the filter again even though its new is right
on. Say Bart do you have a vacuum gage on the filter outlet?

Fresh Breezes- Doug King