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Technical => Engine Tech => Topic started by: nutwagon on November 24, 2007, 11:19:16 AM

Title: What fuel pump would u suggest?
Post by: nutwagon on November 24, 2007, 11:19:16 AM
I heard these stock fuel pumps suck, and I`m puttin E7 heads on my tbird and an E303 cam in it this summer with bigger injectors and computer. what pump would you recommend? Or would it need one?
I`m looking to gain 50 or 60 hp. Oh yea and a gt40 intake too.
Title: What fuel pump would u suggest?
Post by: Kitz Kat on November 24, 2007, 02:47:28 PM
The stock will run 19's,but your getting to the edge of the flow.
for peace of mine a 190 will do.
Title: What fuel pump would u suggest?
Post by: V8Demon on November 24, 2007, 06:16:31 PM
Quote
The stock will run 19's


You mean the stock SO pump?
I wouldn't run 19's on one......
Read here:  http://www.foxtbirdcougarforums.com/showthread.php?t=13859&highlight=math
Title: What fuel pump would u suggest?
Post by: Cougar5.0 on November 24, 2007, 07:33:09 PM
From that post...

Quote from: Cougar5.0

... My 3700lb 20th went 13.7 @ 102 MPH (~ 270 RWHP) when it was N/A using the stock SO pump. That was a 9.7:1 compression P-headed combo that had excellent accleration too (as the track times verify).

OTOH, since technically a 70 lph pump is only good for about 225 flywheel HP, I would advise upgrading the pump to at least a 110 lph pump (~350 FWHP) on N/A HO conversions.


A 155 lph pump will work fine...
Title: fuel pump
Post by: 86T-bird on November 27, 2007, 09:26:44 PM
Good advice on the 155 lph pump.  After installation, check the fuel pressure, it may need to be adjusted.
Title: What fuel pump would u suggest?
Post by: grutinator on November 27, 2007, 11:02:53 PM
Quote from: nutwagon;189430
I heard these stock fuel pumps suck, and I`m puttin E7 heads on my tbird and an E303 cam in it this summer with bigger injectors and computer. what pump would you recommend? Or would it need one?
I`m looking to gain 50 or 60 hp. Oh yea and a gt40 intake too.


seeins how stock SO's are 155 and regular HO's are 225, you should at least gain 70, in theory. the e303 is a lil more powerful then a HO cam. and are you doing all those mods to your stock engine? your in for a rude surprise if you are. one word, FLAT-TOP...PISTONS, ok thats like 3 words.:hick:
Title: What fuel pump would u suggest?
Post by: V8Demon on November 28, 2007, 07:28:52 AM
Quote from: gruntinator
one word, FLAT-TOP...PISTONS, ok thats like 3 words.


Which with stock size valve non-milled E7 heads SHOULD be okay PTV clearance wise.  Check to make absolutely sure though.
Title: What fuel pump would u suggest?
Post by: thunderjet302 on November 28, 2007, 12:36:33 PM
I run a 155 lph pump with no problems.
Title: What fuel pump would u suggest?
Post by: JrP on November 29, 2007, 07:16:19 PM
I found a formula for figuring out what  capacity fuel pump is required. Follow these steps.
1.  horsepower x .5 = lbs fuel/hr
2.  lbs fuel/hr  / 7  = gallons/hr
3.  gallons/hr x 1.3 =  minimum capacity of pump in gallons/hr
 
step 3 adds 30 percent to the total to allow for friction losses in the plumbing,etc.

so a 300 hp engine requires in gph?
1. 300 x .5 =150
2. 150 / 7 =21.43
3. 21.43 x 1.3
= 27.86 gph @ your required operating pressure
Title: What fuel pump would u suggest?
Post by: SLEEPER T-BIRD 87 on November 29, 2007, 08:28:27 PM
Run a 255 pump and have no worries later when you upgrade some more.
Title: What fuel pump would u suggest?
Post by: Cougar5.0 on November 29, 2007, 11:18:54 PM
Quote from: SLEEPER T-BIRD 87;190230
Run a 255 pump and have no worries later when you upgrade some more.


Doesn't the idea of heating all the extra circulating fuel bother you?
Title: What fuel pump would u suggest?
Post by: V8Demon on November 30, 2007, 01:03:40 AM
Heating fuel isn't the issue with a 255.  At idle will you use the full capacity of a 155 on a stock HO?  Many people throw 155's on them.

The issue is with a 255 you NEED an AFPR because the stock FPR diaphram cannot hold back the volume of fuel a 255 puts out when a car is lumping along at idle.  Fuel pressure will actually creep up.

If that's all your looking to do performance wise with the additional little thing maybe down the road the 155 will more than suffice.
Title: What fuel pump would u suggest?
Post by: Cougar5.0 on November 30, 2007, 08:31:41 AM
Yeah, I was wondering about the ability of the stock FPR to return the extra fuel. I'm glad I'm using a 190lph with a BAP (Boost-A-Pump.) I was using a 155lph with BAP when I hit the 11's at the track. That's about 525 HP at the flywheel. Oh, and the bigger the pump, the more fuel circulated and the more it's heated.
Title: What fuel pump would u suggest?
Post by: 88BlueBird on November 30, 2007, 12:17:50 PM
I have a 155lph pump in my car. Naturally aspirated the 155lph pump easily support power levels up to 450 flywheel HP
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