Re: [Chrysler300] Carburetion Question!!! - reply

["Warren Anderson" <wranderson@xxxxxxxxxxxxx>]

Hi Warren,

Would you still take issue with this setup if a momentary contact switch
were used instead of a toggle?

Just curious.

Best Regards,

Thomas F. Miller
tfm@xxxxxxxxxxxx

A toggle could be used that is intermittent. This would mean that the pump
was only on when the switch (button or toggle) was activated and the
ignition switch was on. However, the need will arise when booster pump
service is needed while driving down the road. This I have much experience
with. Operating the boost switch while driving would take one hand to
operate and possible driver inattention. In past discussions, necessary use
of the booster pump 'in flight' has been noted by other Club members.

My experiences: Booster electric pumps have much shorter life expectancy
than mechanical fuel pumps. Adding in an extra element to the fuel delivery
system means an additional something to break and something else to check
out to see what  is possibly broken in the system when the need arises.
Needed electrical pieces become further complicating factors.

My carbureted pickup finally would not operate on the low vapor pressure
fuel we have now without a booster so it has one (with an oil pressure shut
down) but I do not like having it on the truck and would not have it there
except that it won't go up hills without it.

There are oil pressure switches that are used OE to control electric fuel
pumps. These are what I use for retro pump installations. These switches
fail. The one in my truck is probably 10 years old so my early on
reservations concerning using the switch has proven to be a non issue. My
first oil pressure switch installations incorporated a relay to power up the
pump. Relays switch every FI pump that I know of in modern iron. Stopped
using relays a number of years ago and a single switch on my truck has
outlasted two pumps.

For the rest of the story and why I take time to explain. Once apon a time,
in the interest of keeping things simple, I did orchestrate fuel pump
installations without relays or oil pressure safety switches. I selected a
relatively heavy duty lighted toggle switch as control and mounted it high
and visable. A lot of instruction went with the installation. Only ever had
trouble with one fellow who killed the engine and left the key on/pump
running and started a scary fuel fire in his motorhome .Four PSI fuel at the
pump and then through the engine pump (off) and then through the needle and
seat.  Did not end up my problem and operator error for sure, but I learn
qiuick so no more single switch pumps for me. Switches and relays then the
switch only gig which has worked well - - -so far.

Just for the record, so all know that I have what is to me a very good
reason to recommend against wiring in a pump without engine off/pump off
protection. And, I think NASCAR specifies mechanical pumps so that engine
not running, fuel positively not pumping.  Safer than any safety switching
system? I think so.

Have thought about adding a primer push button to the system on my truck but
the booster comes on when cranking and fuel does come up acceptably fast.

Warren Anderson
Sedona,AZ



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