99 Volvo Penta 5.0Gi won’t get power to fuel pump.

[Searsnathan81]

Having an issue with my 1999 Volvo penta 5.0 gi getting power to the fuel pump.

So far I have replaced the fuel pump and both relays next to the fuel pump still not getting fuel.
I have checked the kill switch aswell.

I was able to bypass the relay and put direct power to the fuel pump (from the 87 pin from the relay) and it starts and runs fine at idle as soon as I pull the 12v jumper it dies. Prior to this, the motor ran fine until satarday afternoon. The motor died on me a few times, But after letting it sit for a bit it would activate the fuel pump again and start up.

Any help would be great on this situation.


Thanks

 

[alldodge]

Hope its not the ECM but starting to sound like it. If it is at least there are folks that can repair

The ECM applies a ground to pin 86 from J1-23. Put a meter on pin 86, there should be 12V when key is turned ON then it goes to 0V and back to 12V as the ECM switched. Check continuity of the wire

 

[Searsnathan81]

Really not what I was hoping to hear.. was also thinking one of the fuses in line. How do I get to the fuses? Are they just wrapped in tape with the wires? I couldn’t seem to find a fuse box of any sort.

 

[alldodge]

They should be close by the relays. There not wraped in tape, either in a box or with a cap. Can be individual or all in a row type connector.

 

[Searsnathan81]

They should be close by the relays. There not wraped in tape, either in a box or with a cap. Can be individual or all in a row type connector.

Also where can I a printable version of the wiring diagram you provided? And worst case scenario where can I get the eco repaired and what does it cost?
Thanks

 

[alldodge]

Manual HERE

Repair and testing
https://obd2allinone.com/mefiecms.asp

 

[Searsnathan81]

Hope its not the ECM but starting to sound like it. If it is at least there are folks that can repair

The ECM applies a ground to pin 86 from J1-23. Put a meter on pin 86, there should be 12V when key is turned ON then it goes to 0V and back to 12V as the ECM switched. Check continuity of the

Hope its not the ECM but starting to sound like it. If it is at least there are folks that can repair

The ECM applies a ground to pin 86 from J1-23. Put a meter on pin 86, there should be 12V when key is turned ON then it goes to 0V and back to 12V as the ECM switched. Check continuity of the wire

So after a little more research in the on position I have 12v to both red wires and very low voltage coming out of the yellow and black wire going to the relay(less than .5) I didn’t get a chance to check the yellow and black from the harness at the ecu. So I’m hoping there might just be a break in the wire. Especially since really don’t have 1700 bucks laying around for a new ecu. My question is now can I put a 12v fused jumper with a switch and just run it directly to the the black and yellow on relay or even directly to the yellow for the fuel pump. That way I can turn it off when not using. Will I hurt anything?

Thanks for you help

 

[alldodge]

Got your PM and would like to keep all the info here

Hey dodge,
I was talking to you the other day in the forum about my issue with not getting power to my fuel pump. So after a little more research in the on position I have 12v to both red wires and very low voltage coming out of the yellow and black wire going to the relay(less than .5) I didn’t get a chance to check the yellow and black from the harness at the ecu. So I’m hoping there might just be a break in the wire. Especially since really don’t have 1700 bucks laying around for a new ecu. I did run a 12v jumper directly to the fuel pump wire (yellow) and it started right up. My question is now can I put a 12v fused jumper with a switch and just run it directly to the black and yellow wire that came from the ecu on relay or even directly to the yellow for the fuel pump. That way I can turn it off when not using. Will I hurt anything?

The relay pins 85/86 go thru the magnetic coil of the relay. When the ground side of the coil is not grounded by the ECM, you should see 12V on both sides of the coil. If your not seeing power on both sides then either the connection or the relay then maybe the issue

The problem with connecting a switch to turn ON the fuel pump, is if there is a problem and the motor needs to be shut down, the fuel pump will keep running and could make matters worst. Could be dangerous

 

[Searsnathan81]

Got your PM and would like to keep all the info here


The relay pins 85/86 go thru the magnetic coil of the relay. When the ground side of the coil is not grounded by the ECM, you should see 12V on both sides of the coil. If your not seeing power on both sides then either the connection or the relay then maybe the issue

The problem with connecting a switch to turn ON the fuel pump, is if there is a problem and the motor needs to be shut down, the fuel pump will keep running and could make matters worst. Could be dangerous

Is there anything that could be broken for the ecm to not send 12v to the 86 pin? All the wiring and relays checked out good.
Thanks in advance

 

[alldodge]

The ECM applies a ground to pin 86, and this turns the pump ON
Yes something inside the ECM could be broken and would need to be sent out for testing if that is the problem. If the wire from pin 86 to ECM is intact, then the ECM needs to be checked

 

[cgrant55]

Is there anything that could be broken for the ecm to not send 12v to the 86 pin? All the wiring and relays checked out good.
Thanks in advance

Have you checked your ground? I had the same issue a few weeks ago with my port engine. Key on but would not activate the pump. It would crank and do everything else normal but pump would not activate and supply fuel. Had power all the way to pump and pump was good.

Ended up being a loose ground and once it was secured back in place it starts and runs fine.

Can't speak if your 12v jumper method negates this as a possibility but throwing it out there

 

[rwfloberg]

Have you checked your ground? I had the same issue a few weeks ago with my port engine. Key on but would not activate the pump. It would crank and do everything else normal but pump would not activate and supply fuel. Had power all the way to pump and pump was good.

Ended up being a loose ground and once it was secured back in place it starts and runs fine.

Can't speak if your 12v jumper method negates this as a possibility but throwing it out there

Where was your loose ground?

 

[bruceb58]

Out of curiosity, is this the Ford or GM engine?