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Author Topic: No fuel at injectors  (Read 483 times)

April 17, 2018, 03:54:36 pm

jhonyquest97

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No fuel at injectors
« on: April 17, 2018, 03:54:36 pm »
1.6 d.
Had it running and it got a leak at the high pressure head and I replaced the gasket by removing the pump from the car.

Now she won't start. Here's what I have done already.

New battery 800cca

Tested stop solenoid in the pump as well as out of the pump. Functions properly.

Verified timing or motor at flywheel, camlobes and lock, and lock in injection pump pulley.

Installed clear fuel lines

Installed a temporary electric fuel pump between filter and IP.

Filled IP at inlet and outlet   

Ran electric pump to verify fuel coming through to IP

Cracked the fuel lines at injectors and also tried at the head on the pump and cranked the motor. Got no fuel.

Ran direct line from battery to stop solenoid



Here's what I'm seeing.

10v at stop solenoid even with brand new battery.

After cranking air bubbles slowly backing out of the inlet on the IP.




I'm at a loss here for what to do. I mean how can I get fuel through the pump? 

Any help is greatly appreciated



Reply #1April 17, 2018, 04:27:37 pm

sgnimj96

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Re: No fuel at injectors
« Reply #1 on: April 17, 2018, 04:27:37 pm »
jump the fuel solenoid  straight from the battery to test with full voltage.   

 Take the plunger out of the fuel solenoid if you're still not getting fuel (just to see if you can get fuel out the lines at the injectors).    A mechanical failure of the fuel stop solenoid seems rare tho.    It's just a magnetic thing,  if you take the plunger out it has fuel all the time.
81 Scirocco 1.6D (conversion)               86 Gofl 1.6D                          1985 300TD

Reply #2April 17, 2018, 04:40:47 pm

ToddA1

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Re: No fuel at injectors
« Reply #2 on: April 17, 2018, 04:40:47 pm »
10v all the time, or just when the GPs are on?  Agreed, jump the solenoid.

Smoke at the tailpipe?  Were you able to bleed the lines? 

-Todd

Reply #3April 17, 2018, 07:03:58 pm

jhonyquest97

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Re: No fuel at injectors
« Reply #3 on: April 17, 2018, 07:03:58 pm »
I'll pull the plunger. It would be odd because also because I've tested it out of the pump by jumping it to the battery. Pulls back hard. Can't hurt to try though.

Reply #4April 17, 2018, 07:12:11 pm

jhonyquest97

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Re: No fuel at injectors
« Reply #4 on: April 17, 2018, 07:12:11 pm »
If I turn the electric pump on will the fuel theoretically flow through?  Or does the pulley need to be spinning

Reply #5April 17, 2018, 07:53:02 pm

sgnimj96

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Re: No fuel at injectors
« Reply #5 on: April 17, 2018, 07:53:02 pm »
If I turn the electric pump on will the fuel theoretically flow through?  Or does the pulley need to be spinning

Sure,  but the out-bolt restricts the flow considerably.    The out bolt orifice is so tiny,  the pressure on the return lines is like 2psi.
81 Scirocco 1.6D (conversion)               86 Gofl 1.6D                          1985 300TD

Reply #6April 18, 2018, 12:02:23 pm

jhonyquest97

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Re: No fuel at injectors
« Reply #6 on: April 18, 2018, 12:02:23 pm »
Ok so I pulled the plunger and 12v at solenoid (not that it matters right lol)

Hooked up the electric pump

Disconnected the fuel hardlines from the IP

Cranked the motor twice for 15-20 seconds.

Nada. No fuel comming out the head


Reply #7April 18, 2018, 02:34:02 pm

sgnimj96

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Re: No fuel at injectors
« Reply #7 on: April 18, 2018, 02:34:02 pm »
?

Maybe you should elaborate on how exactly you fixed the leak in the injection pump.
81 Scirocco 1.6D (conversion)               86 Gofl 1.6D                          1985 300TD

Reply #8April 18, 2018, 02:54:46 pm

jhonyquest97

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Re: No fuel at injectors
« Reply #8 on: April 18, 2018, 02:54:46 pm »
Took the pump off. Loosened the four head bolts one half turn at a time while tightening a longer bolt in the timing port. Did this little by little until I saw the oring. Cut that oring off and stretched the new oring over the head, into the groove for it.  Then did reverse. Slowly tightening the four bolts and loosening the timing port bolt.

You think something felt out in there?

Reply #9April 18, 2018, 03:02:13 pm

libbydiesel

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Re: No fuel at injectors
« Reply #9 on: April 18, 2018, 03:02:13 pm »
If the stop solenoid plunger is removed and you are showing fuel flowing through feed and return lines, and still you have no fuel spitting from the delivery valves, I would have to assume that something internal is not correct (e.g. snapped plunger). 
Use, abuse or ignorance of any information is at your own risk, confirmation or refutation is your own responsibility, no further 'proof' will be given, take it or leave it, YMMV,terms subject to change without notice, avoid contact with eyes or skin, contents known to cause cancer in California

Reply #10April 18, 2018, 03:57:59 pm

jhonyquest97

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Re: No fuel at injectors
« Reply #10 on: April 18, 2018, 03:57:59 pm »
I'll check to see if it's actually going out the return line. It's seems more like its just not flowing through at all but I'm not sure until I get clear lines on the return line.

I mean I see fuel moving as I crank the motor so maybe it is

Reply #11April 19, 2018, 01:30:23 pm

fatmobile

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Re: No fuel at injectors
« Reply #11 on: April 19, 2018, 01:30:23 pm »
When you say you installed clear fuel lines,.. did you put one on the return line?
 Weird that air comes out of the front of the pump, even though you have a helper pump.
 Did you swap banjo bolts and put the "OUT" bolt on the front of the pump?
Tornado red, '91 Golf 4 door,
with a re-ringed, '84 quantum, turbo diesel, MD block

Reply #12April 19, 2018, 05:19:50 pm

jhonyquest97

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Re: No fuel at injectors
« Reply #12 on: April 19, 2018, 05:19:50 pm »
I just ran the clear lines from the inlet and outlet. With the electric pump running the fuel flows through and out the return line. However when I crank the motor over, 25 secs this morning, nothing comes out the ports on the head. Could the plunger still read on the timing dial and not deliver fuel? 

Does Giles still build pumps. I think I'm over this one...

Reply #13April 19, 2018, 06:11:32 pm

sgnimj96

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Re: No fuel at injectors
« Reply #13 on: April 19, 2018, 06:11:32 pm »
Seems like the dial indicator would show if the plunger is broken or the rollers fell out
https://youtu.be/9-GSNR7W73M?t=22

Disassembly, cleaning and replacement of all the seals isn't a bad idea anytime one of the seals starts leaking- so don't feel bad about wanting to do that.     A lot of crud could be inside the pump, too.   

Maybe the spill ring got disconnected? ;  I'm not sure of the odds of that being the problem.
81 Scirocco 1.6D (conversion)               86 Gofl 1.6D                          1985 300TD

Reply #14April 19, 2018, 07:08:04 pm

libbydiesel

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Re: No fuel at injectors
« Reply #14 on: April 19, 2018, 07:08:04 pm »
Plunger could be snapped without the dial indicator showing it.  It will still ride up and down with the camplate lifting it and the dial indicator exerting spring pressure to return the snapped part.  It just wouldn't pump fuel because it would all leak out the break.  You'd have to pull the head out very far for a camplate roller to fall out of place.  The little shim at the end of the plunger is the concern.  If that falls out of place, it can put uneven pressure on the plunger foot and snap the plunger.
Use, abuse or ignorance of any information is at your own risk, confirmation or refutation is your own responsibility, no further 'proof' will be given, take it or leave it, YMMV,terms subject to change without notice, avoid contact with eyes or skin, contents known to cause cancer in California

 

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