MEP-002A, will Start, Run then dies....any suggestions?

[1FAST4]

Need access for the videos, but quickly just off the top of my head is your stopping pumping at pressure just clicking really slow?

If you click on the orangish colored link "Vid-1" it should open the video...at least it does when I click on it.

As for the Pump stopping, no, the pump is not clicking slow, it completely stops whether I have a pressure gage attached or if I let the fuel just free flow out of the pump outlet.

Let me know if you still can't see the videos and I'll have to get some help from Guyfang or another available Moderator.

 

[Scoobyshep]

If you click on the orangish colored link "Vid-1" it should open the video...at least it does when I click on it.

As for the Pump stopping, no, the pump is not clicking slow, it completely stops whether I have a pressure gage attached or if I let the fuel just free flow out of the pump outlet.

Let me know if you still can't see the videos and I'll have to get some help from Guyfang or another available Moderator.

Your videos are in your Google drive so when you click them yes you can view them however when one of us that doesn't have access to your Google drive clicks them it tells us it's restricted and needs permission to access the drive

In your test setup you need something to restrict flow to build pressure are you completely deadheading the pump?

One of two things I can see failing in this situation is something is jammed up or the coil is beginning to degrade and once it cools it starts working again

 

[rickf]

When the pump builds pressure it will stop, if it is deadheaded as your is it cannot move the fuel anywhere so it stops. This is perfectly normal for electric impulse pumps. Rotary vane pumps run all the time. If you have flow it should run forever till the batteries die. In actual use if you turn on the switch the pumps will run quickly and then slow down as pressure builds. They never stop due to the fuel bypassing the injection pump so there is always fuel moving. Bottom line, the pump is working as designed, right down to the set pressure.

 

[rickf]

When the pump builds pressure it will stop, if it is deadheaded as your is it cannot move the fuel anywhere so it stops. This is perfectly normal for electric impulse pumps. Rotary vane pumps run all the time. If you have flow it should run forever till the batteries die. In actual use if you turn on the switch the pumps will run quickly and then slow down as pressure builds. They never stop due to the fuel bypassing the injection pump so there is always fuel moving. Bottom line, the pump is working as designed, right down to the set pressure.

I saw your last post after I posted. You say it does the same thing even free flowing. Have you checked all of the outlet fittings and hose for any restrictions? I have seen rubber hoses delaminate and the flap that falls down inside blocks the line in one direction only. I have seen this in fuel lines and a lot more in brake lines. If that is all free and clear then I would look at the voltage as this is happening to be sure you do not have a loose connection somewhere that is heating up under load and loosing contact. Last but not least is the pump, if it is binding it will get pretty warm pretty quickly.

 

[Scoobyshep]

Id also look at current draw, and coil resistance (both idle and after stalling)

 

[Ray70]

When you were cleaning the pumps did you thoroughly clean all of the check ball assemblies and make sure none were sticking?
Your issue of the pump running and suddenly stopping, even with the lines open sounds to me like one of the outfeed check balls is sticking closed, essentially dead heading the line and stopping flow, which stops the plungers from clicking, as Rick mentioned.
The fact that the pump ran fine ( dry) on the bench also supports this theory because it won't dead head without being full of fuel.

 

[1FAST4]

I saw your last post after I posted. You say it does the same thing even free flowing. Have you checked all of the outlet fittings and hose for any restrictions? I have seen rubber hoses delaminate and the flap that falls down inside blocks the line in one direction only. I have seen this in fuel lines and a lot more in brake lines. If that is all free and clear then I would look at the voltage as this is happening to be sure you do not have a loose connection somewhere that is heating up under load and loosing contact. Last but not least is the pump, if it is binding it will get pretty warm pretty quickly.

All the hoses and fittings are clean and clear.
Tested pumps using 2-12v batteries in series. Voltage is good and constant.

 

[1FAST4]

Your videos are in your Google drive so when you click them yes you can view them however when one of us that doesn't have access to your Google drive clicks them it tells us it's restricted and needs permission to access the drive

Got it...Hopefully this works...Please let me know if it does.

Here are new links to the videos from my today's earlier post:

Vid-1
Vid-2
Vid-3
Vid-4

 

[Scoobyshep]

That worked.

Definitely not normal behavior.

 

[1FAST4]

When you were cleaning the pumps did you thoroughly clean all of the check ball assemblies and make sure none were sticking?
Your issue of the pump running and suddenly stopping, even with the lines open sounds to me like one of the outfeed check balls is sticking closed, essentially dead heading the line and stopping flow, which stops the plungers from clicking, as Rick mentioned.
The fact that the pump ran fine ( dry) on the bench also supports this theory because it won't dead head without being full of fuel.

Yes, I cleaned the Pump very well...Twice. Knowing their importance, I paid particular attention to the Check Ball in the bottom end of the plunger and the spring loaded one that goes in the end of the plunger spring as. The below pic is before cleaning. One thing I did notice on the ball inside the bottom plunger is that it was free floating, not spring loaded like the one that sits in the bottom of the plunger spring...is that normal? I didn't think to really compare it with the other pumps.