803A Hard to start

[quartermeter]

If I start it every day it’ll start. If I wait a week I’ve got a crank it 12 to 15 times before it will start. Once it started it runs fine.
I’ve got a fuel pump but I haven’t changed it yet to see if that made a difference.
what else could it be?
Thanks great site.

 

[quartermeter]

If it’s losing its prime what would cause that? I thought about that.

 

[Scoobyshep]

when you go to start, turn the selector to prime and run. what does the pump sound like? is it rapidly clicking or slow clicks?

 

[Ray70]

You should crack open the Banjo bolt coming out of the fuel filter housing. Upon turning S1 you should have immediate flow at the loosened banjo bolt. If not, you will need to start checking your fuel delivery system.

If your system is draining back, simply turning on the pump and letting it run for a minute should refill it and help diagnose this possibility.
The metering pumps require some pressure to work. They will not pump unless they are fed with about 5 psi.

Also check your fuel shut off solenoid and make sure it is pulling fully inward as soon as you start cranking. If not, the machine will not start easily.

 

[Guyfang]

Keep in mind, there is no "check valve", per say in the set. The electric fuel pump itself is designed to stop fuel from draining back in the system. Mostly, it works just fine. That may be an area to look at. Like Ray, I think, and always did myself, turn the set to prime. and let it run a short while, before starting.

 

[quartermeter]

You should crack open the Banjo bolt coming out of the fuel filter housing. Upon turning S1 you should have immediate flow at the loosened banjo bolt. If not, you will need to start checking your fuel delivery system.

If your system is draining back, simply turning on the pump and letting it run for a minute should refill it and help diagnose this possibility.
The metering pumps require some pressure to work. They will not pump unless they are fed with about 5 psi.

Also check your fuel shut off solenoid and make sure it is pulling fully inward as soon as you start cranking. If not, the machine will not start easily.

It Clicks fast

 

[quartermeter]

You should crack open the Banjo bolt coming out of the fuel filter housing. Upon turning S1 you should have immediate flow at the loosened banjo bolt. If not, you will need to start checking your fuel delivery system.

If your system is draining back, simply turning on the pump and letting it run for a minute should refill it and help diagnose this possibility.
The metering pumps require some pressure to work. They will not pump unless they are fed with about 5 psi.

Also check your fuel shut off solenoid and make sure it is pulling fully inward as soon as you start cranking. If not, the machine will not start easily.

Are the steps for checking the fuel shut off solenoid in the maintenance manual? Where is that solenoid located at the fuel pump

 

[Scoobyshep]

Are the steps for checking the fuel shut off solenoid in the maintenance manual? Where is that solenoid located at the fuel pump

If its clicking fast its not primed. Try this, leave it in prime/run until the clicking slows, then attempt to start.

 

[Lovetofix]

Are the steps for checking the fuel shut off solenoid in the maintenance manual? Where is that solenoid located at the fuel pump

There is no fuel shutoff solenoid.
The stop/run solenoid (right in the center of the exhaust side of the engine) moves the (internal) rack to close the fuel metering lever on each of the individual injection pumps.


Sent from my iPhone using Tapatalk

 

[Ray70]

Hold on... the pumps in an 802 / 803 make the same sound all the time. They do not slow down once the system is correctly primed. They are different than the magnetic plunger pumps in the 002/003 which slow down to a slow click once the system if full and primed.
Unfortunately the pumps in an 802 / 803 can also sometimes sound the same even when the are not pumping at all. The only way to tell for sure is to open up the system and test flow and pressure. The audible test only works on the air cooled machines.

 

[Daybreak]

Howdy,
The MEP-802A/803A will have a hollow sound while priming, you will hear the sound change to a fuller sound when primed.
Starting procedure
Turn to prime, wait... wait... Turn to start, hold it on start, you are waiting for the oil pressure rise, which also flashes the exciter, oil pressure up, let go of S-1

 

[Scoobyshep]

Hold on... the pumps in an 802 / 803 make the same sound all the time. They do not slow down once the system is correctly primed. They are different than the magnetic plunger pumps in the 002/003 which slow down to a slow click once the system if full and primed.
Unfortunately the pumps in an 802 / 803 can also sometimes sound the same even when the are not pumping at all. The only way to tell for sure is to open up the system and test flow and pressure. The audible test only works on the air cooled machines.

I really need to stop reading these posts on my phone.

 

[quartermeter]

I really need to stop reading these posts on my phone.

Is this the auxiliary fuel pump if I’m standing at the the control panel this is on the left side behind the door, Towards the far end of the machine from where I’m standing.

 

[quartermeter]

Is this the auxiliary fuel pump if I’m standing at the the control panel this is on the left side behind the door, Towards the far end of the machine from where I’m standing.
This is what’s clicking when I turn the switch to prime
View attachment 813288

 

[Guyfang]

No. Primary pump.

Have you downloaded the TM's and maybe read the -10 operators manual?

 

[quartermeter]

No. Primary pump.

Have you downloaded the TM's and maybe read the -10 operators manual?

I read of 2-109 diagram 2-21. My pic looks like #50

 

[quartermeter]

I read of 2-109 diagram 2-21. My pic looks like #50

Here’s the TM-#

 

[Guyfang]

Both the Main and AUX old style pumps look the same. They are not quite 100% the same, but very close. Are you having a problem?

 

[quartermeter]

Well I put the e8131 on my 803 this morning as primary pump. It’s getting fuel to the filter. When I open the drain it shoots out with good pressure. But it still won’t start. I checked air filter it’s not clogged. tried to start it with air filter out still wouldn’t start. I have a video but can’t figure out how to load it.
What next?

 

[Ray70]

If your fuel solenoid is pulling in correctly when you attempt to crank, and the linkage is moving freely to the right , next thing I would do is crack the lines on top of the 4 metering pumps, crank from S1 ( not the dead crank switch ) and see if you are getting little spurts of fuel out of all 4 lines.
If you are, then next step is to move up top to the injectors.
If you are not getting fuel from the metering pumps it is probably time to inspect the fuel rack and the metering pumps.