Author Topic: Fuel pressure or lack thereof  (Read 11166 times)

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Offline earlbrown

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Re: Fuel pressure or lack thereof
« Reply #15 on: September 08 2012, 03:58:00 PM »
Dropping the tank isn't that bad. Car ramps and a 5gal bucket are the perfect height to keep you out of trouble when the tank comes loose. The worst part of the whole job is the dust.

If you detonate hard enough to crack two pistons and have to rebuild the entire damn engine because of it you'll feel pretty pissed (trust me, I know!)
'87 GN - 4.2L SFI Turbocharged innercooled V6 - Chrome valve covers - supra pump - 14" K&N - 52mm throttlebody - rocker shaft supports -  1/2 intake spacer - TB coolant bypass - 3" ATR exhaust tip - Alum intake pipe - NOS timing cover - chip - relocated charcoal canister - CR42's - stock

Offline SuperSix

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Re: Fuel pressure or lack thereof
« Reply #16 on: September 08 2012, 04:01:32 PM »
Thanks Earl - the 5 gallon bucket idea is something I hadn't thought of.
'87 GN, 60lb, TA49, THDP, FTP cam, T+ lots o' shit - SOLD
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Offline earlbrown

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Re: Fuel pressure or lack thereof
« Reply #17 on: September 08 2012, 04:13:42 PM »

It's just low enough to get in there, blow off the dust and disconnect the hoses and wiring
'87 GN - 4.2L SFI Turbocharged innercooled V6 - Chrome valve covers - supra pump - 14" K&N - 52mm throttlebody - rocker shaft supports -  1/2 intake spacer - TB coolant bypass - 3" ATR exhaust tip - Alum intake pipe - NOS timing cover - chip - relocated charcoal canister - CR42's - stock

Offline Just a Six?

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Re: Fuel pressure or lack thereof
« Reply #18 on: September 08 2012, 05:39:22 PM »
A floorjack & a peice of plywood also works well for getting it back in the aproximate spot.
David
87 LTD. Purchased May 88
Doeskin leather, coach lites without Landau Roof, moon roof, carpeted trunk & No Factory Hood Ornament!
The sticker on AC shows a V-8 Carb car. Special order by Mr. Nick Hall VP of GM Canada
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Offline SuperSix

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Re: Fuel pressure or lack thereof
« Reply #19 on: September 09 2012, 09:45:26 AM »
A floorjack & a peice of plywood also works well for getting it back in the aproximate spot.

I have done that - but if there's any amount of fuel left in the tank, it will get unstable if moved too quickly.
'87 GN, 60lb, TA49, THDP, FTP cam, T+ lots o' shit - SOLD
'07 Ford F150 Lariat 2WD, 5.4L 3v - 255k
'20 Kubota BX2380. FEL, 60" deck
'78 IH/Case 184 Lo-Boy
'99 Kawasaki Bayou 400 4x4

Offline Steve Wood

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Re: Fuel pressure or lack thereof
« Reply #20 on: September 09 2012, 10:39:16 AM »
I have done that, but, I find it easier to just use my elbows and knees and slide it down on top of me...then I slide out and pull the tank from under the car once I have wiggled out from under the tank....easy if there are only two or three gallons in the tank
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Offline phil_long

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Re: Fuel pressure or lack thereof
« Reply #21 on: September 10 2012, 10:53:37 AM »
i hate dropping the tank. by far a PITA

Dropping it is easy.
The work comes when it's time to put it back in!!  :player:
Which is part of the process of "dropping the tank." You cant just leave it off. Lol

Offline dennisL

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Re: Fuel pressure or lack thereof
« Reply #22 on: September 13 2012, 05:58:18 PM »
Well the new pump arrived today but all I had time for was to drain the tank and disconnect the  hoses and harness.  Tomorrow is "drop the tank" day.  Right now its time for a beer. :atbeer:
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Offline Just a Six?

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Re: Fuel pressure or lack thereof
« Reply #23 on: September 13 2012, 06:42:39 PM »
The tank is usually a 2 beer job from start to finish so your halfway home after the 1st beer!  :atbeer: :player:
David
87 LTD. Purchased May 88
Doeskin leather, coach lites without Landau Roof, moon roof, carpeted trunk & No Factory Hood Ornament!
The sticker on AC shows a V-8 Carb car. Special order by Mr. Nick Hall VP of GM Canada
Runs 11.50 on 21 lbs with my old style 67 Q Trim & Alchy

Offline phil_long

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Re: Fuel pressure or lack thereof
« Reply #24 on: September 14 2012, 11:00:17 AM »
Good luck Dennis!! :atbeer:

Offline I Love Factory ECMs

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Re: Fuel pressure or lack thereof
« Reply #25 on: September 14 2012, 04:36:18 PM »
God gave us two knees and an elbow for putting it back in

LOL ,  been here, spit,spit (20 year old road debris.......)

Offline I Love Factory ECMs

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Re: Fuel pressure or lack thereof
« Reply #26 on: September 14 2012, 04:39:05 PM »
Don't forget a "Hotwire" kit if don't have one already, or maybe best to add after ,if problem remains try the Kit
Enjoy!

Offline dennisL

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Re: Fuel pressure or lack thereof
« Reply #27 on: September 17 2012, 07:08:30 PM »
I've got a hot wire setup so voltage at the pump is good.


Well I changed the pump and added a new bulkhead harness from Racetronix.  Their pump installation kit and harness is well made.  The only issue I had was the polarity was reversed on the bulkhead to pump wires which I fixed.


I rebuilt the Accufab regulator, adjusted it to 43.5psi (line off) then took a short test drive.  I now get 53psi fuel pressure with 16 lbs boost.  Doing the math indicates I should see 59 psi so my question now is "Should I worry about the missing 6psi?"
'87 GN (original owner)
'70 Buick Electra 225 Convertible
'69 Camaro ZZ502

Offline Steve Wood

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Re: Fuel pressure or lack thereof
« Reply #28 on: September 17 2012, 07:14:41 PM »
yes...might start with the gauge
Steve Wood

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Offline dennisL

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Re: Fuel pressure or lack thereof
« Reply #29 on: September 17 2012, 07:52:23 PM »
I have two pressure gauges besides the one on the car but they're old (like me).  The one on the car is new but its not one of the "big 3" brands.  (I was trying to save a few $$.)  Can you recommend one that I could use as a reference to "calibrate" the others?
'87 GN (original owner)
'70 Buick Electra 225 Convertible
'69 Camaro ZZ502

 

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