OK I haven't posted up since before I got it running......swap was completed and has been fantastic - I have put 20k km on it already.
Here is the problem....in late summer after a long 2k mile trip I was thankfully not too far from home out fishing - got back to the truck - it would not start. Traced the problem to the fuel pump - I got home by jumping the pump directly from the battery (subwoofer power) - pump would not run through the normal circuit but would run through the direct line to the battery. I replaced the pump and It has run like a champ every since - until last night.
Last night the truck just died while driving down the street and would not start back up again - just like before. THis morning I checked a few things - made sure I had power getting to igniter, MAF etc. - then thought it might be the pump again - so I jumped the pump directly off the battery again and the truck starts right up and runs great.
Once I got home i probed the connector at the pump and read the voltage while turning over the motor - 2-3volts!???- I jumped the pump and started the motor and again probed the connector to the pump - fluctuating between 2-3.5 volts????
Now I rember the last time (see above) I did the same and I had under battery voltage when starting and battery voltage while running. I thought this to be strange at the time - but looking at the "circuit opening relay" it is not a standard relay and at the time I thought maybe Toyota varies the voltage to the pump for some reason??? When I put in the new pump I just assumed the old pump was worn and required more intial voltage/amperage than the stock circuit would provide and therefore would not get going, but of course ran well with a direct line to the battery - seemingly this was confirmed when the new pump ran fine.
So what the heck is going on?? Anyone know what voltage I should be seeing at the pump?
Sorry for the longwinded story-any help is appreciated.
