[Vwdiesel] VE pump problem

[Mark Shepherd]

I would check the output of the pump by draining the return into a jello jar, with the engine Look for a pint a minute or so.

The fact that it will idle and fast idle, the internal vane pump must be lifting a little, or do you get no output, so a primed pump will run until it burns it's stored fuel?
Crud may have shifted and bound the pump vanes. 

Revving engine must result in significantly increased fuel output. If it doesn't then it is the vanes, as you have already stated that the fuel drains out from the pump 
when syphon opened. 

Stripping pump is the way to go.It really is easy. If you go to jack's site, and look for "And now for something completely different" You will find a little trick [mine actually] 
for testing that you have a good vane pump before reassembling the entire injection pump.

There could also be a fault with the govenor. The weights may be sticking open. This can be due to the condom like sleeve on the weights spindle sticking/binding. 

You can check the pressure regulator for dirt, by undoing it with a 10mm open ended spanner, if you don't have the convenience to make a modified socket. 
Incidentally the crud can get from the bottom of the main chamber if agitated, back to the lift side of the pump and into the vans regulator etc, because the one side of 
the advance piston is chamber lubricated under vacuum, from a tunnel under the pump and back to the downstream side of the vane pump...

Mark


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Message Received: Jan 19 2015, 03:25 AM
From: "sandy cameron" 
To: "diesel" 
Cc: 
Subject: [Vwdiesel] VE pump problem

I can't remember if I have ever asked for help on this forum before, 
even tho I have been here for years.

Cutting to the chase, My trusty, but venerable 1989 1.6 TD has suddenly 
developed a pump problem.

On Friday, 16 Jan, I ventured north west from Stittsville, near Ottawa, 
to Arnprior, about 25 miles NW from here.

The trip was uneventful (except for the arctic temperatures, What a 
great little heater she has!) at speeds around 60 mph.
A couple of times I found myself creeping above that, and had to ease 
off to avoid velocity taxes eagerly collected by our provincial 
government, who's premier refers to us as "revenue tools".

Arriving at destination, I parked in a steep driveway, nose up, and 
spent an hour delivering an old 2 metre ham rig, setting it up, and 
making a few local contacts.

The owner and I then headed out to a local coffee shop to celebrate. I 
started up normally, backed down the lane into the street, and drove off.

I quickly noticed the car was not behaving properly, it would idle 
normally, and run a street speeds,but topped out at about 2800rpm. (no 
tach).
The "top-out " felt like fuel starvation.

I made it home at 45-50mph max, on the level and down hill, and 
struggled up the hills at about 30mph. The "fuel starvation was 
consistent, and the speed varied with the load.

My fuel system is plumbed with clear tubing, so the diagnosis developed 
quickly. The filters were all ok and fuel flowed freely right out of 
the OEM filter. Yet, the transfer pump in the injection pump would not 
suck fuel.

As always, with fuel delivery issues, I rigged my specially designed "IV 
drip" apparatus, feeding the pump directly. Even with the supply jug 
elevated above the pump, fuel would not flow.

I cracked the inlet banjo bolt, and fuel gushed out by gravity.

The obstruction or defect is INSIDE THE PUMP!!

It may be mechanical, like a spring or lever in the governor section, 
but that would not affect the fuel flow.

The car had behaved completely normal up to being parked nose-up, and 
went in to the partial fail mode as soon as it was next moved. (an hour 
later)

On the half-hour return journey, it behaved normally, except it could 
not go faster than 50 mph, and drooped on hill ascents.

It was NOT icing or Gelling, because it was thoroughly warmed up to 
normal temperature. and the blockage is internal to the pump, as proved 
by the fuel douche bag.

How does the pump internal pressure control work? is it a bypass return, 
spring control valve?

What could happen in the transfer pump that would cause it to quit from 
being parked nose-up? Or, just being shut off for an hour and then 
re-started?

I have a couple of pumps here I can swap in, but I'm fishing for a 
"simple, stupid" solution.

James, I'm counting on you>


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