MEP-803A genset no crank

[jaybird67k]

I got all the chewed wires fixed and my test lights work and it turns over but the fuel pumps aren't working. I have no fuel in the system because the tank needs cleaning. Will the fuel pumps run dry without fuel or is the float telling them not to run?
About to go check voltage at pumps.

Thanks, Jason

 

[Light in the Dark]

Do you have no fuel lights on?

 

[kloppk]

The primary fuel pump E2 should run as long as S1 in in Prime/Run, Prime/Run/Aux or START as long as there are no engine or fuel Faults on the Fault Monitor.
K12 is the engine fault relay. Normally the contacts in the highlighted path is closed unless there is an engine fault.
S1-3 is the "Run" signal 24 volts DC.

 

[jaybird67k]

Do you have no fuel lights on?

The "no fuel" light?
If so no its not on unless I hit the test light switch. Checked voltage at both pumps with then in their perspective S1 position and get .5 volts. 1/2 volt.

 

[kloppk]

With S1 in Prime/Run the primary fuel pump E2 should get +24 volt power from the Fault Relay K12-1.
Here is the wiring patch to check along for +24 volts to the Primary Fuel pump. J13/P13 is the 2 pin fuel pump connector
Wire #'s.......119F.........................................119E................................119C.......................119D
K12-1---------------TB-5-1---TB5-2--------------J7-6--P7-6---------------TB4-12---------------J13-1--P13-1--------------E2 Fuel Pump Positive

edit. Fixed so wire number are above each wire.

 

[jaybird67k]

With S1 in Prime/Run the primary fuel pump E2 should get +24 volt power from the Fault Relay K12-1.
Here is the wiring patch to check along for +24 volts to the Primary Fuel pump. J13/P13 is the 2 pin fuel pump connector
Wire #'s 119F 119E 119C 119D
K12-1---------------TB-5-1---TB5-2--------------J7-6--P7-6---------------TB4-12---------------J13-1--P13-1--------------E2 Fuel Pump Positive

I unhooked the 2 pin on both pumps and checked with S1 in prime for main them prime for aux. That's where I got 1/2 volt. I will trace out the wiring and let y'all know what I find.

Thanks, Jason

 

[kloppk]

Ignore the Aux Fuel Pump power for now.
Focus on getting power to the primary pump. It's needed to run the engine.
The Aux fuel pump only refills the tank with fuel. It does NOT provide fuel to the engine.

 

[flyfishtrailer]

Is it possible that the fuel tank float is stuck above where it would trigger the low fuel light?

 

[jaybird67k]

Ignore the Aux Fuel Pump power for now.
Focus on getting power to the primary pump. It's needed to run the engine.
The Aux fuel pump only refills the tank with fuel. It does NOT provide fuel to the engine.

Ok will do. Back to the other question I had. Will the pumps run without fuel in the tank and the lines?
Thanks, Jason

 

[Light in the Dark]

They will run if they have power, and are not being overriden by a fault. If you followed Kurts writeup and you dont have 24VDC+ at the pump connector, you need to determine where its dropping out.

 

[jaybird67k]

They will run if they have power, and are not being overriden by a fault. If you followed Kurts writeup and you dont have 24VDC+ at the pump connector, you need to determine where its dropping out.

Thanks

 

[Guyfang]

You can remove the tank cover and pull up the FL1 and FL2 switch. Then manually operate the float or floats.

 

[jaybird67k]

With S1 in Prime/Run the primary fuel pump E2 should get +24 volt power from the Fault Relay K12-1.
Here is the wiring patch to check along for +24 volts to the Primary Fuel pump. J13/P13 is the 2 pin fuel pump connector
Wire #'s.......119F.........................................119E................................119C.......................119D
K12-1---------------TB-5-1---TB5-2--------------J7-6--P7-6---------------TB4-12---------------J13-1--P13-1--------------E2 Fuel Pump Positive

edit. Fixed so wire number are above each wire.

Ok so I tried troubleshooting this today and now im having a S1 crank issue with no panel lights. This was all working the other day after I fixed the wiring. Checked the FU 1 30 amp its good. It cranks over from the engine compartment but not S1.
Nothing has changed. Tried resetting the 7.5 fuse pull.
No power at the panel switch or light and none of the terminal blocks.
I'm checking with multimeter with - on ground and + on all connections.
No voltage at any TB's

 

[kloppk]

So it dead cranks OK but no power to the panel.
Any chance the red Emergency Off button is pushed in?
Put the Dead Crank switch in NORMAL and check for 24 volts at:
- both used terminals on the Emergency off switch
- both terminals on CB1
- terminals 2,4,6 & 8 on S1
- terminal 2 on S2

 

[jaybird67k]

So it dead cranks OK but no power to the panel.
Any chance the red Emergency Off button is pushed in?
Put the Dead Crank switch in NORMAL and check for 24 volts at:
- both used terminals on the Emergency off switch
- both terminals on CB1
- terminals 2,4,6 & 8 on S1
- terminal 2 on S2

Emergency out is out.

 

[Light in the Dark]

Test it. Do you have 24V at both side terminals when its pulled out, and only at one side when pushed in?

 

[jaybird67k]

So it dead cranks OK but no power to the panel.
Any chance the red Emergency Off button is pushed in?
Put the Dead Crank switch in NORMAL and check for 24 volts at:
- both used terminals on the Emergency off switch
- both terminals on CB1
- terminals 2,4,6 & 8 on S1
- terminal 2 on S2

I checked continuity on the red button and it checked out good. Will do the other checks you mentioned when I get home.
Thanks

 

[jaybird67k]

With S1 in Prime/Run the primary fuel pump E2 should get +24 volt power from the Fault Relay K12-1.
Here is the wiring patch to check along for +24 volts to the Primary Fuel pump. J13/P13 is the 2 pin fuel pump connector
Wire #'s.......119F.........................................119E................................119C.......................119D
K12-1---------------TB-5-1---TB5-2--------------J7-6--P7-6---------------TB4-12---------------J13-1--P13-1--------------E2 Fuel Pump Positive

edit. Fixed so wire number are above each wire.

 

[jaybird67k]

Ok crank issue at S1 solved. I had the engine compartment crank switch off.....lol.
So back to the E2 fuel pump. I have 25 volts at TB-5 at terminal 1&2.
25 volts at TB-4 terminal 12.
Have 24 volts at E2 pump plug when putting my multimeter negative on battery negative and positive on one of E2 plug terminals

So you think the pump is locked up or bad?
I'm gonna jumper wire 24 volts straight to the pump next.
Any help is greatly appreciated.

Thanks

 

[Ray70]

Yup, sounds like your pump is dead. Especially if it's a Facet cube style pump.... those are notoriously bad!