relay it via the oil pressure switch or something similar so it only
feeds fuel if the crank is rotating.

Ok, I want to make sure you really understand this... it's important. The
fuel pump should only be working when the engine is cranking to *start*, OR
there is oil pressure. When you're cranking the engine to start it, there is
no oil pressure, but you need fuel. Once it's started, AND you have oil
pressure, the fuel pump works as well. The scenario you want to avoid is a
running engine, being fed fuel, with NO oil pressure.

James' advice is dead on. The pump needs to be wired to the cranking
terminal of the
starter *AND* (not OR) to an oil pressure switch.

--Mike



"Bennie via BoatKB.com" u31788@uwe wrote in message
news:6ddf7681e40a8@uwe...
Thanks for all that info - for the time being while I get this running
while
OUT the water I can leave it alone but I will definitely work out away to
either relay it via the oil pressure switch or something similar so it
only
feeds fuel if the crank is rotating. Again brilliant advice from you all.
Thanks.

Anyone have more thoughts about the raw water pump and the possible need
to
cool the stern leg?
I don' know if I need that...... I am a going mechanical and electronics
guy -
planes .....yes. Boats....not yet!!

I did see that that alternator was not a Marine version but I have worked
out
a way to "seal" it so no sparks get out. The starter looks like a marine
version though.
Thanks again on the pump issue - almost certainley save me a bit of grief!

Mike wrote:
When ign switch is off - no fuel....

No good! There should only be fuel when the engine is cranking (to start),
or there is oil pressure (engine running). The latter could save your
engine
as well. If the oil pressure drops for any reason, the fuel pump will cut
out, and the engine will stop before you melt the block. If the ign switch
is simply on, and the engine isn't running, the fuel pump should NOT be
moving fuel.

--Mike

It is on the same circuit as the coil...When ign switch is off - no
fuel....
[quoted text clipped - 15 lines]

Eisboch

--
Message posted via http://www.boatkb.com

On Feb 15, 10:13 pm, "Mike" wrote:
relay it via the oil pressure switch or something similar so it only

feeds fuel if the crank is rotating.

Ok, I want to make sure you really understand this... it's important. The
fuel pump should only be working when the engine is cranking to *start*, OR
there is oil pressure. When you're cranking the engine to start it, there is
no oil pressure, but you need fuel. Once it's started, AND you have oil
pressure, the fuel pump works as well. The scenario you want to avoid is a
running engine, being fed fuel, with NO oil pressure.

James' advice is dead on. The pump needs to be wired to the cranking
terminal of the
starter *AND* (not OR) to an oil pressure switch.


better yet, On a Delco starter, That is, if it's a GM motor, the Delco
starter should have two small terminals on the solenoid switch. one
for "start" (S) and the other is "relay" (R) .
Instead of wiring the fuel pump to the (S) terminal as perscribed,
wire it to the (R) terminal which is an inner switch, that when the
starter is cranking it will provide a full 12v shot to your fuel
pump.

If you wire the pump to the (S) terminal, the voltage pull from the
pump itself, can rob you of power to the pull-in coil[s] in the
solenoid, giving weak solenoid performance, causing the starter not to
work properly.

Got it...


Mike wrote:
relay it via the oil pressure switch or something similar so it only
feeds fuel if the crank is rotating.

Ok, I want to make sure you really understand this... it's important. The
fuel pump should only be working when the engine is cranking to *start*, OR
there is oil pressure. When you're cranking the engine to start it, there is
no oil pressure, but you need fuel. Once it's started, AND you have oil
pressure, the fuel pump works as well. The scenario you want to avoid is a
running engine, being fed fuel, with NO oil pressure.

James' advice is dead on. The pump needs to be wired to the cranking
terminal of the
starter *AND* (not OR) to an oil pressure switch.

--Mike

Thanks for all that info - for the time being while I get this running
while
[quoted text clipped - 34 lines]

Eisboch

--
Message posted via BoatKB.com
http://www.boatkb.com/Uwe/Forums.aspx/boats/200702/1