[urq] Better fuel pump needed
a.sigal at bluewin.ch
Sat Oct 6 10:40:34 PDT 2007
It seems to me like normal that to any question, people chime in their
experiences, and the the person who posed the question makes the
conclusions and decisions based on info that came in, and not he other
way around. No question, or suggestions based on experience can be
trivial, because they consolidate the picture, and therefore help, Ben
in this case, to find a solution. Those suggestions already covered are
easily discharged and other taken in and acted upon.
What was established within the exchange is not trivial at all.
Cody has established that 044 CIS pump is well sufficient for the job in
Scott has established that fuel supply can be a problem, and suggested
We all know that on Urq the f/pump supply can be a problem.
Based just on these three facts, one could make some clear conclusions,
- One could install in-cabin f/pressure gauge and establish for sure the
- To establish if there is a supply problem, one could monitor the
engine behaviour with full, and low on fuel tank. If there is any line
restriction in fuel supply, it would show with this test.
- To establish/eliminate completely the supply problem one could
slightly pressurize the fuel supply, or run separate line from separate
tank sitting on the back shelf.
- Considering that pump circulates the fuel in quantity well over
quantity needed for the engine, and supply to injectors is controlled by
FPR, the one should establish if there is FPR problem, which there could
well be, since Ben had manifold pressure/vacuum problem before, and FPR
is normally controlled via vac/press line, one could install adjustable
FPR and see what happens.
To cap it all, it could be that when Ben instals new pump, the problem
could be gone, so this problem could be indeed trivial, although
consecutive f/pump failures on same car, which could be quality related,
but also suggests otherwise.
So, if I was to suggest something magically trivial, I would say: The
best and cheapest is to install f/press. gauge and go from there.
Sorry Scott, there are no deep or shallow solutions, there are only
solutions for problems, which in the end are always based on the owners
subject knowledge, and always end up to be totally logical, as soon as
the culprit is found. It is only owners knowledge and experience that
makes a problem or a solution magical or trivial.
Anyway Ben, one shouldn't be critical about any input from the list,
because it does exactly what is made for; to help to find a solution for
the problem that the owner isn't able to solve on his own, so I'd say:
Folks, keep on chiming in, noting is trivial and no solution is magical.
What works magically is pooled knowledge, and this group worked its
magic thousands of times before.
QSHIPQ at aol.com wrote:
>I don't agree Ben's whining, maybe challenging folks like you and me.
>'Regular folks' should know Ben as well as they know you. After 10 years on this
>list, I learned there are newbies and not-so-newbies. I put Ben in the
>latter category easily. Which means, I make the assumption he has done the
>'obvious', and that this EFI 10vt car is cavitating the fuel pump. As a rule, the
>stock lines and pumps can handle ~350HP, then they really should be addressed
>with some other mod. I suspect line diameter would do it, but the Walbro
>alternative pumps could do the trick, and are pretty standard in the Japanese
>cars (ala my supercharged 4.5L DOHC landcruiser).
>On occasion, those outside the envelope are looking for deep solutions. I
>find Ben's post challenging, not insulting. It appears he's added enough
>power to the 10vt that deeper solutions might be necessary. I rarely post,
>certainly not to the newbies, as I feel that's what 'search' is for in the
>archives. When I see something new being asked regarding the 'old' 10vt
>applications, I'm in quickly.
>Huw, I would think the outcome of this might be good for your FAQ pages.
>After visiting Ben's home garage, the thought of a 'newbie' question, seems
>oxymoronic to me. I'd encourage you don't confuse his looking for higher level
>thinking for anything but that.
>In a message dated 10/6/2007 1:39:09 A.M. Central Daylight Time,
>audi at humanspeakers.com writes:
>> Come on guys..
>You posted like a newb with a fp prob, but expected deep solutions.
>Sorry if some regular folks tried to help...
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