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AAZ won't pump fuel...
by
Patrick
on 18 Jun, 2018 02:56
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Haven't posted in a long time. Swapped an AAZ into a 92 Jetta this weekend, pulled out an AAZ that's getting tired (low compression). Engine I swapped in ran when pulled from another car a lot of years ago but was tired. Had a start issue that I traced to the input seal on thr pump, kept losing it's prime. new seal, went through the whole engine. Rings, bearings, head studs (plans for the future), water pump etc. Been on the shelf for a lot of years. Finally put it in the car this weekend. No luck getting the injection pump to move fuel. Currently sitting overnight with fuel/ATF mix in the filter and the pump. I'm assuming the vane pump is stuck from sitting around.... Anyone got any suggestions?
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#1
by
Tmarkle
on 18 Jun, 2018 05:17
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May seem like a stupid question but do you have 12v to the shut off solenoid?
Sent from my iPhone using Tapatalk
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#2
by
Patrick
on 18 Jun, 2018 07:23
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Good thought but there's power and I hear a click at the pump when rhe key is turned on.
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#3
by
libbydiesel
on 18 Jun, 2018 16:45
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You filled the fuel filter and pump entirely with fuel before trying, right? My favorite way is to pull a vacuum on the return fitting. With clear supply and return lines do you see fuel move at all? It should move regardless of stop solenoid activation/function. If it is not moving fuel when cranking, then the vane pump vanes are stuck or the pressure regulator is stuck flowing all fuel back to the supply. Smart money would be on the vanes being stuck.
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#4
by
Patrick
on 18 Jun, 2018 17:17
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Thats my guess too... pump and filter full.
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#5
by
ORCoaster
on 18 Jun, 2018 17:46
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Since he provided this for context:
Engine I swapped in ran when pulled from another car a lot of years ago but was tired.
And he already replace the front seal.
I would put my dime on the vanes being stuck as well. They do that if they sit for a few months.
You might have luck with some Diesel Purge and not have to pull the pump apart.
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#6
by
Patrick
on 18 Jun, 2018 19:00
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I'm hoping so. If I have to I can pull the pump off the engine I just pulled but would rather not. Need that engine complete for another project.
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#7
by
Patrick
on 19 Jun, 2018 14:39
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It runs. Left it sitting for about a day with 1/2 diesel 1/2 ATF in the pump. Looks like that was enough to free up the vane pump. Made sure everything was full, cranked until I had fuel at all 4 injectors. Fired! Still some detail work to do but should be on the road again this week.
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#8
by
libbydiesel
on 19 Jun, 2018 16:21
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Excellent! Glad to hear that worked.
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#9
by
ORCoaster
on 19 Jun, 2018 17:42
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I love simple fixes that take care of themselves overnight while you snooze on it.
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#10
by
Patrick
on 19 Jun, 2018 18:18
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Excellent! Glad to hear that worked.
ME TOO! Old truck driver's trick, using ATF to clean up fuel systems. Don't know if you'll find it in a repair manual anywhere....
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#11
by
Patrick
on 23 Jun, 2018 08:03
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On the road again....