My "White Truck" build/project

BramanteCummins

BramanteCummins

ADD maniac
Joined
Nov 1, 2012
Messages
636
Hey guys, its been a LONG time but I'm finally back in a truck. Played with TDI and V8 audi a bit and got bored. Until I found this gem...

1998.5 with a supposedly 13mm pump, full cuts, 7x14 injectors, hamilton 188/220, 66 over 83, fass 200, studded, o-ring'd, cut pistons, marine head gasket.

Seller said "it runs till its warmed up then gets dead pedal and dies"

Went down, ran it till warm. nothing. over ¾ throttle it got choppy and rough but came down and idled smooth. Bought it.

Went to load it on the trailer and it finally dies. wouldn't start. pulled off clogged/collapsed air filter, fires right up. Idles rough takes some pedal to keep it running.

At the shop, fires right up runs great. a few shakedown passes later and it stalls. start with pedal, stalled. start it with ¾ throttle, fires up unwillingly, let it run at high rpm until its semi stable then slowly let rpm down until foot is off pedal.

another pass back the the bay and blew a boot... doh!


A few questions, is a 13mm pump the same as 12mm as far as timing it goes? (lift amount in correlation to degrees)
Opinions on what is going on with the pump. Seems like a funky gov to me. haven't gotten into it yet. maybe this weekend.
 
I assume fuel pressure is still good when the truck is acting up starting?


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Sounds a lot like fuel supply. Maybe tie the shut off back and check fuel pressure
 
stubz616 said:
I assume fuel pressure is still good when the truck is acting up starting?


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Click to expand...


Fuel pressure is good. Though it will draw pressure down to 25-30 from 45


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97rada said:
Sounds a lot like fuel supply. Maybe tie the shut off back and check fuel pressure
Click to expand...


Shut off solenoid is gone, converted to cable operated (going back to solenoid). Not sure if that answers that.


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Not the problem then. When does it draw down that hard? Sounds kinda like air to. I would hook up a line and fresh filter to shop fuel and run it
 
There is no filter at the moment, the old one was starting to invert.

Problem is it will do this after a WOT pass easiest. Otherwise it will take hours of idle time


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The fuel sensor is just after the pump/filter. I'll move it up to just before the injection pump


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Sounds like it could be a bad injection pump with scored barrels/plungers.

I'd swap the pump out and see how the truck runs.
 
That's expensive :( I was hoping to not have to rebuild. What's the going rate for redoing a 13mm...


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Big Blue24 said:
Sounds like it could be a bad injection pump with scored barrels/plungers.

I'd swap the pump out and see how the truck runs.
Click to expand...

Thats what i was thinking. Had a friends truck that acted that same way. Got a rebuilt and benched P7100 and it solved the problem.
 
Knew your name looked familiar. Sucks to hear you're having problems already.
 
The last time I had one with those exact symptoms it was a plunger in the pump hanging when it got hot. Swapping pumps fixed it.
 
I'm going to have to agree with BigBlue.

Does the fuel pedal become harder to push when it acts up? If so... pump time.
 
Another vote for pump. Exact symptoms I have seen when the pump was the culprit. I think some put way too much faith in that oil line on the side of a P7100 and ignore fuel quality/pressure.
 
Snedge said:
I'm going to have to agree with BigBlue.

Does the fuel pedal become harder to push when it acts up? If so... pump time.
Click to expand...


Not that I noticed, seems the same.

Thanks for the input, I'll see if my socket has enough spline left to pull the holders off for inspection.

What is everyone running for injectors/delivery valves nowadays? I know these are too big.

https://vimeo.com/165295074


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