fuel pump question
Thread Starter
Safety Car
Joined: Sep 2012
Posts: 4,688
Likes: 41
From: Palm Harbor, Florida
fuel pump question
Can a worn or going fuel pump cause sluggishness and jerking at full WOT off the line from a dead stop? Rochester 750 cfm is the carb on a 383
thanks
ps. iginition components are all relatively new and tuned. Unless of course my china made distributor from local auto parts store has all of a sudden crapped out, but I don't want to entertain that as my problem right now.
thanks
ps. iginition components are all relatively new and tuned. Unless of course my china made distributor from local auto parts store has all of a sudden crapped out, but I don't want to entertain that as my problem right now.
Last edited by Doug1; Jan 13, 2013 at 08:10 PM.
Le Mans Master
Joined: May 2002
Posts: 5,086
Likes: 786
From: Lebanon Township New Jersey
Usually fuel pump flow problems will show up at wide open throttle after a few seconds. A weak pump will normally keep the bowl full at idle or part throttle but won't keep up at full throttle. So I think your problem is elsewhere. Is your secondary air valve adjusted right? Opening too soon will cause your symptoms.
Thread Starter
Safety Car
Joined: Sep 2012
Posts: 4,688
Likes: 41
From: Palm Harbor, Florida
Usually fuel pump flow problems will show up at wide open throttle after a few seconds. A weak pump will normally keep the bowl full at idle or part throttle but won't keep up at full throttle. So I think your problem is elsewhere. Is your secondary air valve adjusted right? Opening too soon will cause your symptoms.
I want to check fuel pump psi. but I need to go to my father in laws in order to do that, as I don't have the gauges. But I figured if there was no chance that the fuel pump could cause issues in first few seconds, why bother checking the pump, because I know also that rochester's don't require much. top end is pretty good, I can get it to cough some if I try hard enough with total WOT.
thanks BK
Thread Starter
Safety Car
Joined: Sep 2012
Posts: 4,688
Likes: 41
From: Palm Harbor, Florida
I hope not too. this issue of jerking and chuging at full WOT off the line is a new all of a sudden issue. but the coughing through carb I have been battling for several weeks now....
Instructor
Joined: Oct 2009
Posts: 165
Likes: 1
From: Stanley NC
Well in Florida is a company called All American Carburetors and they do great remanufacting, not just rebuilt and my q-jet was just $300 and came back like new so if think maybe a carb issue may want to look up their website.
Thread Starter
Safety Car
Joined: Sep 2012
Posts: 4,688
Likes: 41
From: Palm Harbor, Florida
Ok, thanks, I know you guys love your Rochester's, but if I gotta shell out that kind of money, I'm leaning toward something new. I'm getting tired of chasing this problem around. I'm ready for it to run like it should, and I'm not all that concerned with gas mileage either.
