Re: FUEL PRESSURE FLUCTUATIONS
[Re: QUIKFISH1850]
#447885
08/26/09 07:49 PM
08/26/09 07:49 PM
|
Joined: Jan 2003
Posts: 4,287
Morrow, OH
markz528
master
|
master
Joined: Jan 2003
Posts: 4,287
Morrow, OH
|
I will guess you have a liquid filled gage - -either replace it with non-filled or drain the liquid out.
67 Coronet 500 9.610 @ 139.20 mph
67 Coronet 500 (street car) 14.82 @ 94 mph
69 GTX (clone) - build in progress......
|
|
|
Re: FUEL PRESSURE FLUCTUATIONS
[Re: rowin4]
#447887
08/26/09 08:22 PM
08/26/09 08:22 PM
|
Joined: Jan 2003
Posts: 4,852
KENTUCKY
69CHARGERMD
master
|
master
Joined: Jan 2003
Posts: 4,852
KENTUCKY
|
Mine seems to fluctuate as well,,,nothing to do with the gauge either,,,,
Could a bad ground,,,or some electrical gremelin do this ?
Air in the line do this ?
|
|
|
Re: FUEL PRESSURE FLUCTUATIONS
[Re: 69CHARGERMD]
#447888
08/26/09 08:30 PM
08/26/09 08:30 PM
|
Joined: Jan 2003
Posts: 19,384
Las Vegas
Al_Alguire
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 19,384
Las Vegas
|
I know this sounds crazy but I was having the same issue. The solution was new needle and seats, after trying everything else.
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
|
|
|
Re: FUEL PRESSURE FLUCTUATIONS
[Re: 69CHARGERMD]
#447891
08/26/09 08:57 PM
08/26/09 08:57 PM
|
Joined: Jan 2003
Posts: 19,384
Las Vegas
Al_Alguire
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 19,384
Las Vegas
|
No they looked fine. It was a problem I had very intermittently. I changed them after I had another carb that belonged to someone else on the car. He had an issue we fixed and fired it up on mine just to make sure. Rock solid fuel pressure and it had all new stuff in it. I replacd mine and it returned to rock solid pressure.
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
|
|
|
Re: FUEL PRESSURE FLUCTUATIONS
[Re: Al_Alguire]
#447892
08/26/09 09:10 PM
08/26/09 09:10 PM
|
Joined: Aug 2007
Posts: 316
Ohio
Lil Wedge
enthusiast
|
enthusiast
Joined: Aug 2007
Posts: 316
Ohio
|
Quote:
I know this sounds crazy but I was having the same issue. The solution was new needle and seats, after trying everything else.
|
|
|
Re: FUEL PRESSURE FLUCTUATIONS
[Re: Lil Wedge]
#447893
08/26/09 09:15 PM
08/26/09 09:15 PM
|
Joined: Jan 2003
Posts: 4,287
Morrow, OH
markz528
master
|
master
Joined: Jan 2003
Posts: 4,287
Morrow, OH
|
Also need to remember that a dead-head regulator needs to be adjusted while the car is running or the settings will not be accurate/repeatable.
67 Coronet 500 9.610 @ 139.20 mph
67 Coronet 500 (street car) 14.82 @ 94 mph
69 GTX (clone) - build in progress......
|
|
|
Re: FUEL PRESSURE FLUCTUATIONS
[Re: markz528]
#447894
08/27/09 01:52 AM
08/27/09 01:52 AM
|
Anonymous
Unregistered
|
Anonymous
Unregistered
|
your blowing through the needle and seats.
you need to get a product engineering return system to keep the fuel flowing.
it seems to be a problem with the magnafuel & product engineering high flow pumps.
|
|
|
Re: FUEL PRESSURE FLUCTUATIONS
[Re: Otherlane]
#447896
08/27/09 07:55 AM
08/27/09 07:55 AM
|
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
|
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
|
Quote:
What is a dead hard regulator? I've been having problems with my carb.its either shoot gas out the front,rear or both vent tubes out the carb and this happens even though its sits at 7 pounds but not all the time. I have a new BG regulator.do I need to run the engine with the regulator to get a good reading? or trash in the needle and seat. this carb is new.we didn't have this problem when this carb was on the dyno [/quote
A dead head regulator is the NON return type... if
its blowing out the vents the pressure is blowing
the needle off the set.... I'm sure you havent checked
the gauge for accuracy but more than likely its
greater than 7 psi... on a known good gauge the needle
can handle about 7 1/2 psi, at 8 psi it can blow the
needle open(this is why we set the pressure at 7 1/2 max
on the production pumps at Chrysler..... I had to
flow a TON of pumps in the fuel lab)
Or your setting the float level too high... but if
you watch the float window(Holley) you might see it
creeping upward or dumping fuel out while open...
which is a pressure issue OR bad needle and seat
|
|
|
Re: FUEL PRESSURE FLUCTUATIONS
[Re: Otherlane]
#447898
08/27/09 08:35 AM
08/27/09 08:35 AM
|
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
|
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
|
Quote:
I have a two port bg regulator but while the car running the needle at 7 and it shoots the gas out.the gas is right at the site level but I don't know where it is while its running.i will check it out when I get home.thanks p-body
Forget the gauge right now.... lower the pressure
on the regulator(way low) and get the engine running
then slowly up the pressure on the regulator till
you get a idea where it will hold at.... then do a
gal per minute flow test(in a bucket)
|
|
|
|
|
