i have my motor out as of right now, and i want to check my fuels system for leaks. My problem is, if everything disconnected the fuel pump will not prime? mine wont, with my stock comp or aftermarket. Is this supposed to be? i think it might but not sure
thanks

 

upp

 

It probably depends on what's removed or disconnected in your case. If the ECU, main relay, & most wiring are still in place, it should work.

 

all the wiring is still in place, i reinstalled the ecu and no prime, just the whole engine is disconnected

 

I guess I don't know what's different. I'd wanna see a wiring drawing for YOUR model & year before I pretend to know too much. I really didn't think the engine physically has to be there.

Got a Helm book? Maybe some of the ECU/mainrelay/fuelpump circuits travel thru a wiring harness that you've got disconnected? Have you unplugged some of those connections near the brake master cylinder?

Does your engine have a group of ground wires at the thermostat? Maybe that's what's missing? Your ECU won't power up without (+) AND (-) power.

 

not sure, but you can always do a direct wire to pump set up

 

i was gonna try that but thought it would power up without the engine.


Jimblake- yes it does have a group of groung staps on the thermostat, thats what i figured too would be the reason the ecu wouldent power up. Its a 99 ex chassis and harness if it helps

Can anyone positively agree with this

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vtekthis &raquo;</TD></TR><TR><TD CLASS="quote">... Its a 99 ex chassis and harness if it helps...</TD></TR></TABLE>So what is it? Your signature says '91 Civic SI. It's a '99 Civic EX?

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vtekthis &raquo;</TD></TR><TR><TD CLASS="quote">... yes it does have a group of groung staps on the thermostat, thats what i figured too would be the reason the ecu wouldent power up...</TD></TR></TABLE>So did you try taking that bundle of wires & grounding them?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JimBlake &raquo;</TD></TR><TR><TD CLASS="quote">So what is it? Your signature says '91 Civic SI. It's a '99 Civic EX?

So did you try taking that bundle of wires & grounding them?
</TD></TR></TABLE>


My sig says "another black t4 coupe from the east" and a 91 daily

No i did not ground them yet im gonna try tomarrow

 

update- the coolent ground has to be grounded for the ecu to read power, fuel pump primes!