Slant *       6       Forum
Home Home Home
The Place to Go for Slant Six Info!
Click here to help support the Slant Six Forum!
It is currently Tue Dec 23, 2025 3:43 pm

Unanswered topics | Active topics


» » Tech Q & A » Engine

All times are UTC-08:00



Post new topic  Reply to topic  Page 1 of 1
  [ 13 posts ] 
  Print view Previous topic | Next topic 
Author Message
Bren67Cuda904
 Post subject: 390 is pulling over fuel
PostPosted: Tue Mar 31, 2009 6:10 pm 
Offline
Board Sponsor
User avatar

Joined: Tue Jun 27, 2006 8:21 am
Posts: 1614
Location: Orlando, FL
Car Model:
Just got the engine back in today and broke in the cam. I noticed that during break in that any time the engine RPM reached 3000 the front shooters would start to drizzle and as rpm increase they would pretty much be spraying. (only the primaries though) What could cause this?

PS the wide band would go from 13.5 to 10 or even 9.5 when it starts to pull over.

_________________
67Cuda,FAST EZEFI,340cu,CR=10.25,RollerCam&Rocker (XR268HR,#20-810-9)(#1622-16)(EddyRPM#60779,#7576), (MSD6AL,#6425) A904, GearVendorsOD, 8 1/4,3.55:1, ClassicAir
Image
Top
   
Reply with quote  
Joshie225
 Post subject:
PostPosted: Tue Mar 31, 2009 6:21 pm 
Offline
Supercharged
User avatar

Joined: Thu Jan 27, 2005 8:32 pm
Posts: 7834
Location: Portland-ish
Car Model: Fiat 500e
Sounds like the float level is high or possibly the fuel pressure, maybe some of both. There is an anti-pullover booster if you find the float level and fuel pressure are both correct.

_________________
Joshua
Top
   
Reply with quote  
ceej
 Post subject:
PostPosted: Tue Mar 31, 2009 7:10 pm 
Offline
Site Admin
User avatar

Joined: Mon Mar 31, 2003 1:04 pm
Posts: 7456
Location: Oregon
Car Model: 2023 Eichman Digger?
Check the bowl bolt torque. I had that problem when the bowl wasn't tightened up correctly. Vibration caused the accelerator pump to dribble fuel through the shooters. Double check your pump cam clearance too.

CJ

_________________
Part of Tyrde-Browne Racing
Top
   
Reply with quote  
Bren67Cuda904
 Post subject:
PostPosted: Wed Apr 01, 2009 11:28 am 
Offline
Board Sponsor
User avatar

Joined: Tue Jun 27, 2006 8:21 am
Posts: 1614
Location: Orlando, FL
Car Model:
Quote:
Sounds like the float level is high or possibly the fuel pressure, maybe some of both. There is an anti-pullover booster if you find the float level and fuel pressure are both correct.
It coming from the accel pump nozzle.

_________________
67Cuda,FAST EZEFI,340cu,CR=10.25,RollerCam&Rocker (XR268HR,#20-810-9)(#1622-16)(EddyRPM#60779,#7576), (MSD6AL,#6425) A904, GearVendorsOD, 8 1/4,3.55:1, ClassicAir
Image
Top
   
Reply with quote  
Joshie225
 Post subject:
PostPosted: Wed Apr 01, 2009 11:46 am 
Offline
Supercharged
User avatar

Joined: Thu Jan 27, 2005 8:32 pm
Posts: 7834
Location: Portland-ish
Car Model: Fiat 500e
Sorry, meant nozzle not booster. Anti-pullover boosters would be a bad thing.

_________________
Joshua
Top
   
Reply with quote  
ceej
 Post subject:
PostPosted: Wed Apr 01, 2009 11:59 am 
Offline
Site Admin
User avatar

Joined: Mon Mar 31, 2003 1:04 pm
Posts: 7456
Location: Oregon
Car Model: 2023 Eichman Digger?
Grab the bowl and push and wiggle on it without touching the pump lever.

Does it squirt fuel?

CJ

_________________
Part of Tyrde-Browne Racing
Top
   
Reply with quote  
Bren67Cuda904
 Post subject:
PostPosted: Wed Apr 01, 2009 12:27 pm 
Offline
Board Sponsor
User avatar

Joined: Tue Jun 27, 2006 8:21 am
Posts: 1614
Location: Orlando, FL
Car Model:
Bolts are tight and bowl doesn't move. I thought maybe vibration was moving pump arm so I reved it up to the point it started feeding fuel through the nozzle, then held pump arm and it had no effect. Looked under the nozzle (by removing it) and the weighted needle is in there. I also found that if I rev it up even more the secondary nozzle starts fueling also.

_________________
67Cuda,FAST EZEFI,340cu,CR=10.25,RollerCam&Rocker (XR268HR,#20-810-9)(#1622-16)(EddyRPM#60779,#7576), (MSD6AL,#6425) A904, GearVendorsOD, 8 1/4,3.55:1, ClassicAir
Image
Top
   
Reply with quote  
68barracuda
 Post subject:
PostPosted: Wed Apr 01, 2009 12:52 pm 
Offline
Turbo Slant 6
User avatar

Joined: Fri Aug 17, 2007 3:30 am
Posts: 945
Location: Tiegerpoort, Pretoria, South Africa
Car Model:
It sucks..... :twisted: very hard

using mechanical pump ?- what is your fuel pressure like, and your float levels?

_________________
Regards,
Fanie Gerber
It's never junk, it's just a part you're not currently using

http://www.valiant50.co.za
Just say I own a few Mopars
Top
   
Reply with quote  
Bren67Cuda904
 Post subject:
PostPosted: Wed Apr 01, 2009 1:21 pm 
Offline
Board Sponsor
User avatar

Joined: Tue Jun 27, 2006 8:21 am
Posts: 1614
Location: Orlando, FL
Car Model:
Mech pump at 5.5 psi and floats set to just dribble out of side hole if car is bumped slitly.

_________________
67Cuda,FAST EZEFI,340cu,CR=10.25,RollerCam&Rocker (XR268HR,#20-810-9)(#1622-16)(EddyRPM#60779,#7576), (MSD6AL,#6425) A904, GearVendorsOD, 8 1/4,3.55:1, ClassicAir
Image
Top
   
Reply with quote  
68barracuda
 Post subject:
PostPosted: Wed Apr 01, 2009 1:31 pm 
Offline
Turbo Slant 6
User avatar

Joined: Fri Aug 17, 2007 3:30 am
Posts: 945
Location: Tiegerpoort, Pretoria, South Africa
Car Model:
you had your engine out - did you recheck your levels? btw scored a 390 with center hung bowls

_________________
Regards,
Fanie Gerber
It's never junk, it's just a part you're not currently using

http://www.valiant50.co.za
Just say I own a few Mopars
Top
   
Reply with quote  
ceej
 Post subject:
PostPosted: Wed Apr 01, 2009 1:46 pm 
Offline
Site Admin
User avatar

Joined: Mon Mar 31, 2003 1:04 pm
Posts: 7456
Location: Oregon
Car Model: 2023 Eichman Digger?
Did you check the fuel pressure hot or cold? Liquid filled gauge?

Pressure should be checked with engine full cold if you run a gauge under hood. As the fill heats up it gives an artificial low reading as the fluid compresses the bourdon tube.

I'm with Fanie, double check the float level too!

Do you have the weight over check ball, or the weight type needle check? Got some grit in the orifice?

CJ

_________________
Part of Tyrde-Browne Racing
Top
   
Reply with quote  
Bren67Cuda904
 Post subject:
PostPosted: Wed Apr 01, 2009 9:25 pm 
Offline
Board Sponsor
User avatar

Joined: Tue Jun 27, 2006 8:21 am
Posts: 1614
Location: Orlando, FL
Car Model:
Check both hot and cold. Gauge is air filled. There is a needle under the nozzle and it looks like steel, however with a strong earth magnet held over it and the accel arm jolted it doesn't seem to come out.

_________________
67Cuda,FAST EZEFI,340cu,CR=10.25,RollerCam&Rocker (XR268HR,#20-810-9)(#1622-16)(EddyRPM#60779,#7576), (MSD6AL,#6425) A904, GearVendorsOD, 8 1/4,3.55:1, ClassicAir
Image


Last edited by Bren67Cuda904 on Thu Apr 02, 2009 6:20 am, edited 1 time in total.

Top
   
Reply with quote  
Charrlie_S
 Post subject:
PostPosted: Thu Apr 02, 2009 3:59 am 
Offline
SL6 Racer & Moderator
User avatar

Joined: Sat Oct 19, 2002 12:06 pm
Posts: 8977
Location: Silver Springs, Fl.
Car Model:
I have had this fuel "pull over" problem, with both the 500 holley 2bbl, and the 390. Never did cure it. Holley teck was no help either. They told me to drill a small hole from the float bowl into the pump passage, above the fuel level, so the fuel would return to the float bowl, instead of flowing out the shooters. Didn't help.

_________________
Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225
Top
   
Reply with quote  
Display posts from previous:  Sort by  
Post new topic  Reply to topic  Page 1 of 1
  [ 13 posts ] 

» » Tech Q & A » Engine

All times are UTC-08:00

Who is online

Users browsing this forum: Ahrefs [Bot], Google [Bot] and 9 guests

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Limited