Attention Fuel Pump Installers

[Scoobum]

Im a stickler for instructions.. .so I thot I would post this. Not sure why this pic is sideways...sor ry.

[Scoobum]

...

[tar baby]

I just installed mine this weekend , along with a new tank . what is you fuel pressure when you start up your car ?

[Scoobum]

I run my line off pressure a couple pounds higher than Erics recommendation . BLMs check in at 118.

[tar baby]

ok so what's  your pressure when you car is running .

[Scoobum]

Depending how accurate my in car gauge is...bout 40-41 lbs.

[Steve Wood]

Makes no sense.☺  So your FP is 45 psi with the hose off the regulator?  Yet it is 41 when the engine is running?   Do you mean it is 41 when you put the hose back on the regulator?   And the engine is running in both cases?

I'm pretty sure that is what you mean, but I don't know if Tar Baby understands how fuel pressure is set.

Of course it's early in the morning and maybe I am just confused😄

[aminga]

Makes no sense.☺  So your FP is 45 psi with the hose off the regulator?  Yet it is 41 when the engine is running?   Do you mean it is 41 when you put the hose back on the regulator?   And the engine is running in both cases?

I'm pretty sure that is what you mean, but I don't know if Tar Baby understands how fuel pressure is set.

Of course it's early in the morning and maybe I am just confused😄

Get some more coffee.  As long as you're at idle (and under vacum) pressure will go down when you attache the vac line.

[Steve Wood]

Alan, you have to read the thread.  Brad said his hose off pressure was 45 (If you allow for the fact that Eric suggests 43 and Brad is a couple of psi higher).  Then Tar Baby asked what Brad's fuel pressure  was with the engine running?  Most of us would assume that Brad's hose off number was with the engine running...At least I would think most of us would assume that but, I may well be wrong. 

I well understand that fp drops with vacuum.  I am trying to find out if Tar Baby meant what is the fuel pressure was when the hose was put back on since Brad already answered that with the hose off....which is dependent upon how much vacuum the car is pulling at the time of measurement and if that was what Brad meant.

I will make it simple...Brad please ignore my comments   As usual, I am just here to argue the unimportant-I will try not to interrupt anymore

[Scoobum]

My bad. I should have been more specific. It was 41 with the hose on and the engine running. I gotta pull the car out tonite and install the ATR charcoal canister relocation kit. I'll post what the vacuum is...line on...41 PSI. I run Autometer gauges...so how accurate they are is up for speculation.


I recommend following Erics directions. Like Eric, I err on the rich side. Most can't sleep at nite if they're not at the magic 128. Steve can explain in detail how the ECM compensates. An engine running a tad rich at idle...will idle smoother. I've seen Norbs play with idle fuel enuf to know. Fairly certain I read a post awhile back from Cal Hartline saying the same thing.

[Steve Wood]

Brad, I understood what you were saying.  I was trying to be nice so you could explain it as I did not know if Tar Baby understood that the hose on number was basically meaningless between cars due to the differences in vacuum which can vary between cars due to mechanical condition and cam shaft variation.

I should have kept my mouth shut.  I am learning slowly not to get involved in these discussions

[Scoobum]

Keep getting involved...cuz I'm always interested in how things work...and why. I've had people ask me why something works the way it does on these cars. More than once my answer has been...cuz it just does. I wish I could wrap my head around electrical stuff.

[Be4u]

What Steve?! Pbbt... 

I personally love when you correct these knuckleheads.
But seriously, let them babble, a great learning experience comes from correction imho. That's how I learned some of the stuff I know. I remember NickM jacked my dumbass up once about something I was positive about, set me straight and I'll never forget the correction.

Me thinks you thinks you got intelligence compitition, again, pbbt... 

[Scoobum]

Here's the info...and I damn near choked to death on C16 fumes with this thing idling in the garage. I must be losing my mind...


RPM-900 via SM
15 inches of vaccuum
Fuel pressure-41 lbs line on

[tar baby]

I was asking because after I installed the pump my pressure shot up to 60 pounds .