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02-26-2014, 09:16 PM
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#1 |
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Registered User
Join Date: Nov 2012
Location: melbourne australia
Posts: 196
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New fuel pump removes carb flat spot ???
My quadrajet is really worn so it got the blame for my truck not being able to handle flooring the throttle I have always had to feed it in progressively ever since I fitted my new crate motor it has had with a big flat spot and hessitation.
So when I replaced the fuel pump recently I was suprised to find it completely gone.It is much more responsive as well even with my shot Quad. Finally a win with this old girl. 
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02-26-2014, 09:22 PM
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#2 |
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Registered User
Join Date: Feb 2012
Location: Beautiful BC, Canada, eh?!
Posts: 2,291
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Re: New fuel pump removes carb flat spot ???
That kinda makes sense. The Q-jet doesn't have a very large float bowl, so if the engine draws fuel faster than the pump volume can refill it, you'd get a flat spot. Makes sense!
I just got through doctoring my worn out Q-Jet using Cliff Ruggles book. I also put in new throttle shaft bushings, too. Runs really swell now!
__________________
1961 Apache: "Grabber Orange" Shortboxed, pancake, step-notch, air-ride, turbo, LS 1977 Silverado: Shortboxed & dropped, potato-potato V8 Pontiac Firefly (Chevy Sprint): The ultimate engine swap: 5.7L in a 1.0L bag Lotus Super 7 Replica: Scratch-built street-legal rollerskate |
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02-26-2014, 10:31 PM
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#3 | |
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Registered User
Join Date: Nov 2012
Location: melbourne australia
Posts: 196
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Re: New fuel pump removes carb flat spot ???
Quote:
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02-27-2014, 06:12 AM
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#4 |
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Registered User
Join Date: Aug 2009
Location: S.C.
Posts: 1,593
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Re: New fuel pump removes carb flat spot ???
Cool, mine's currently waiting for a fuel pump. Put-puts fine around town, but hit the throttle and it'll cut out.
Surprise! Sometimes things just work out.
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'86 C-30 dually, 454/tbh400 '73 K-20 350/350/205 (sold  )I'm kinda like duct tape- no real purpose, but handy to have around. |
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02-27-2014, 08:44 PM
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#5 |
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Another Day, Another Dollar
Join Date: Nov 2008
Location: North Vancouver, BC
Posts: 1,316
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Re: New fuel pump removes carb flat spot ???
Hmmmmm..... I oughta give that a try
__________________
-78 K20 Cheyenne 454 long box, 4" lift, 35" MT's, '84 cab, '80 box "its hip to be square" 
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02-28-2014, 10:23 AM
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#6 |
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Registered User
Join Date: Oct 2013
Location: AZ Desert
Posts: 102
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Re: New fuel pump removes carb flat spot ???
Well I just put a new Fuel Pump on my 73' K10 and now I "Have" flat spots under acceleration especially on hills so wtf ?? I also did a full tune up at the same time and think maybe i needed to set the SP gap at .045 instead of the .035 the data plate says since I have a converted HEI. Gonna re-gap and different (HEI) rated plug wires this weekend. Gotta love these old gals...I'll post my findings after the changes are made.
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2017 Infiniti QX70 2015 GMC Yukon Denali XL 4x4 1993 Jeep Wrangler YJ 1973 Chevy Cheyenne K10 4x4 |
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