Engine Fuel pump died after battery failure

[Chuck E.]

My Zmaster Z286E Battery died. Jumped it and it started, engaged PTO and it died. Re jumped it and it started and ran straight to garage but it died getting there. Now tried to jump and engine cranks but no electric fuel pump hum. Just got new battery. same scenario. Checked fuses all visibly good. Momentarily ran a jumper hot wire to fuel pump....it activates. Don't know how to check relays but I am thinking this could be the problem.
Any thoughts??
Thanks in advance, grass is growing, any help appreciated!

 

[reynoldston]

My Zmaster Z286E Battery died. Jumped it and it started, engaged PTO and it died. Re jumped it and it started and ran straight to garage but it died getting there. Now tried to jump and engine cranks but no electric fuel pump hum. Just got new battery. same scenario. Checked fuses all visibly good. Momentarily ran a jumper hot wire to fuel pump....it activates. Don't know how to check relays but I am thinking this could be the problem.
Any thoughts??
Thanks in advance, grass is growing, any help appreciated!

Test fuses I have seen bad fuses that look OK but still tested bad. A relay is just a electric switch. Number 87 and 85 are the coil terminals the activates the switch and 86 and 30 is the switch itself. Very easy to test.

 

[Chuck E.]

reynoldston ,

Thanks for the rapid reply. I will get a continuity meter and check the fuses. For the relays there is 2 relay blocks on the left side of the engine. I will check both. Do I remove them and and check the coils with an ohm meter to see if there is a break. The switch part I assume I activate the coil leads with 12v. and check if the switch opens and or closes. Is that what you are recommending?

 

[reynoldston]

reynoldston ,

Thanks for the rapid reply. I will get a continuity meter and check the fuses. For the relays there is 2 relay blocks on the left side of the engine. I will check both. Do I remove them and and check the coils with an ohm meter to see if there is a break. The switch part I assume I activate the coil leads with 12v. and check if the switch opens and or closes. Is that what you are recommending?

You got it right. Not that much to a relay. Some relays have more terminals but they all work the same way.

 

[bertsmobile1]

Test the relay with a battery.
Hook up the trigger terminals to a battery and it will click
Hook up a wire from a battery to a load like an old headlamp through the relay and see if you can turn the lamp on & off with the trigger terminals.

I never like using a meter on relays because they can test OK but not carry a load.

A new relay is about $ 3 so it might just be cheaper and easier to test by swapping out.
Turn everything off , charge the battery then connect & disconnect it in a dark place.
If you get a spark then there is a short somewhere in the wiring loom.

 

[Chuck E.]

I bench tested both relays with a meter. Both checked OK. I will check tomorrow with a load as suggested by bertsmobile1.
I hate to do it but can I just use a jumper and have the fuel pump on continuous while I cut, Just until I figure out my problem?
Would it cause any harm?

 

[bertsmobile1]

Should be fine.
Just watch for black smoke from the exhaust signialing the fuel pump is over pressureising the carby.
AFAIK none of them pump much more than 5 PSI and all are on contioiosly

 

[Chuck E.]

Swapped out relays. No change. Seems that there is no power to the relay (no click on rear relay). put jumper to fuel pump and tried to start. Found I have no spark. Two huge reasons why it wont run.

Could my ECU have failed and how can I check. I am going to look at service manual to see if I can decipher what to do.

 

[reynoldston]

The fuel pump, relays, and fuses all tested OK. Time to test the circuit. Check for loose or broken wires. A wiring diagram might be very handy here.

 

[Chuck E.]

Thanks, I'll let You know.