Fuel Pump Issue??!!
I think I need to buy & new fuel pump. My Holley manual is failing (170GPH) I think & is not enough apparently. I am getting sufficent pressure, but not enough flow at this point?? Here is a brief current setup: Sumped original tank w/ mallory filter @ tank all 10an to pump. Then 8an to reg w/ filter inbetween. from reg 6an to carb which is quickfuel 950hp. Reg is a BP w/ 6 an back to tank. BBC w/ P&P heads, teamG, solid lunatti, about 500Hp. all steel 69 Camaro w/ Th350 & stall.
Symptoms: off idle is fine. mid starts to fail & when secondaries are open for a duration, I get some flat acceleration & poping like it is lean. W/O Acceleration is poor. Carb is new (and larger than last), reg is new, new filters, plugs & wires new. floats set, jets correct, PV (only in primary) checked & is fine. Sound like a pump issue?? I need some electric pump advice. How is Holley blue/black?? I cannot afford the magna flow right now... but I want to get going soon. Have not had to buy a pump in a long time!! Any feed back is appreciated!! Scooter |
ive seen valve spring issues cause similar prob.just a thought
|
Yes I would use an on engine valve spring tester & compare your readings against what you set them up at first since this is a very quick check.Then I would do a "fuel can test" to establish what the output of your fuel system actually is before forking any cash on anything,both these tests are free.
|
Originally Posted by desoto30
Yes I would use an on engine valve spring tester & compare your readings against what you set them up at first since this is a very quick check.Then I would do a "fuel can test" to establish what the output of your fuel system actually is before forking any cash on anything,both these tests are free.
|
how I would go about this would be,hook the carb to an electric pump,with another fuel supply,connect a hose to the output side of the mechanical pump & run the engine @ chosen rpm & then look into the container each time & see how much fuel is there.Yes I totally agree with you to have a fire extinguisher at hand & I would suggest a buddy to assist also
|
Originally Posted by desoto30
how I would go about this would be,hook the carb to an electric pump,with another fuel supply,connect a hose to the output side of the mechanical pump & run the engine @ chosen rpm & then look into the container each time & see how much fuel is there.Yes I totally agree with you to have a fire extinguisher at hand & I would suggest a buddy to assist also
|
Stock or aftermarket fuel tank ? Stock tank will have smaller ID fuel line and a high demand engine will not allow sufficient flow to keep that carb full.
|
Thanks everybody. I want the Holley manual gone no matter what. The motor makes around 500hp, w/ one 4150 950hp flatform. Be it the new carb being starved or the manual pump bad, I just feel an electric is necessary. I have heard of vane style or a g-rotor style.... the g-rotor I am told is better, but requires a BP (which I have). There has to be some folks out there w/ BBC's running Holley blue or Black... on motors like mine... what is your feed back & is it enough? Keep talking to me...
Double -D, I have a stock 69 Camaro tank that is sumped, w/ 10AN to a Mallory filter, 10AN to current pump. Then 8AN to reg, & 6 AN to carb. 6AN is BP. |
Desoto-
Ok, I re-read what you are saying & now I understand it. This is mainly a wild street car driven on the street most of the time. I just don't see a pivotal point w/ valve train to cause this. I have done a visual on the heads & confirmed a .26/.26 int/ex valve lash... look good. No visible issues detected in condition of springs & valve train. Off idle is fine... it has symptoms in upper mid to full throttle. I agree with you, as you probaly know more than i anyways. heres my point: I hate mechanicals... this car warrants a electric in my opinion anyways. So no matter what, I am going to pick a pump- what do you think about holley blue/black? Thanks!! Scooter |
Originally Posted by Rigsby
Double -D,
I have a stock 69 Camaro tank that is sumped, w/ 10AN to a Mallory filter, 10AN to current pump. Then 8AN to reg, & 6 AN to carb. 6AN is BP. Just don't forget that tip over OFF switch ! |
All times are GMT -8. The time now is 11:29 AM. |