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Old 06-07-2018, 09:15 AM   #1
zachu812
 
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13mm pump mysteries

I've been chasing an issue with the setup below for a couple months and I'm just about stumped.

When I first installed the pump I set timing to 20* using spill port and a stock pump gear. Truck had a noticeable lope at idle, ran great otherwise. I could blow the tires off from a 60 roll without brake boosting and the smoke would clear up to a dark haze at wot.

One day I was driving and mid pull around 3600 rpms in 3rd the truck started puking black smoke, barked the turbo, and fell on its face. I slowed down and the truck was running fine but I noticed the lope was gone. Went to do another pull and it left the line hard but fell off up top and wouldn't clean up the smoke anymore.

I assumed timing slipped given the symptoms and a stock pump gear, bought and installed a keyed adjustable gear and set timing back to 20* still ran the same. Checked all intake plumbing, compression, cam, crank gear, pushrods, and valve lash. Everything checked out fine. 215 pump went back on and the truck ran great, beat the **** out of it for a month with no issues at all. Checked over everything I could on the 13mm pump and talked to a few pump guys, couldn't pinpoint anything.

Pump went back on last night, this time at 24* and it acts the exact same. Lope is still gone and the smoke doesn't clear up at WOT, fuel pressure drops from 70psi to 50psi at WOT. It used to run great then started acting up and I cant find what could've changed to cause this. Should I open up the pump or is there something else I should look at? Any insight would be appreciated, I'm at a loss here.


13mm pump, 903 cam, 255 DV holders, 035 DVs, 5k gov springs,
AFC and plate all the way back, stiff afc spring
stock body 6x.013 injectors with another .020 needle lift
stock sized crossover tubes with edge filters removed
.084 injector lines
Fuelab 42401 lift pump at 70psi with -10 line into -8 dual feed
S472/83/1.0 cast SX-3
studs, springs, pushrods
Engine and head are otherwise stock
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2001 RCLB 4x4 auto
13mm, S472, 6x.013
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Old 06-07-2018, 10:14 AM   #2
94 12valve
 
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Sounds like some how your fuel adjustment at WOT has increased. Check the fuel plate in the 13mm make sure its still set where it should be, did not move and the screws are tight. Are you using the same AFC in both the 215 and 13mm pumps?
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94 Dodge RCLB home built Limited Pro Stock Puller The Green Machine
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Old 06-07-2018, 11:56 AM   #3
zachu812
 
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Fuel plate is right where it should be and screws are tight, it was forward a little ways then I moved it back all the way with no change. I should add when stabbing the throttle on a free rev the truck seems to break up a little but I can ease on the throttle and it sounds healthy all the way past 3k
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Last edited by zachu812; 06-07-2018 at 12:05 PM.
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Old 06-07-2018, 12:15 PM   #4
turbo2387
 
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have you checked your delivery valve stacks? might have something funcky going on there. had a issue with free revs with some old 131's once upon a time.
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Old 06-07-2018, 01:21 PM   #5
zachu812
 
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Yup, all DVs were removed and inspected. Didn’t see anything out of the ordinary, I might try throwing in my 181s to see what happens though.
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Old 06-07-2018, 03:11 PM   #6
zstroken
 
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Was your AFC hung up, and eventually enough boost was applied and it broke free?
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Old 06-07-2018, 10:49 PM   #7
zachu812
 
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I’ve checked the afc couple times before and after it started acting up but I’ll look into it. Seeing how the truck acts without the afc line hooked up is on my list too.
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Old 06-08-2018, 09:09 AM   #8
zachu812
 
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Quote:
Originally Posted by zstroken View Post
Was your AFC hung up, and eventually enough boost was applied and it broke free?
Is it possible to over fuel a truck to the point that it falls under the charger? I'm wondering if that's a possibility, when the truck started acting up that was the longest pull I'd done with it since the pump went on.
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Old 06-08-2018, 09:11 AM   #9
jasonc

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Yes, put out the fire.
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Old 06-16-2018, 05:27 PM   #10
zachu812
 
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Pulled the AFC line off and went for a drive, the truck still smokes at WOT and builds boost but doesn’t go anywhere. Snapped a banjo bolt so I didn’t get a chance to try anything else.
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Old 06-16-2018, 06:17 PM   #11
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Advance timing
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