MG Sports Cars

engine swaps and other performance upgrades, plus "factory" and Costello V8s

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jbarila
John Barilaro
Red Sox Nation!
(60 posts)

Registered:
11/02/2007 08:29AM

Main British Car:
1977 MGB Ford 302/5L

Fuel System Opinions.
Posted by: jbarila
Date: March 12, 2008 08:09AM

What is the general consensus on upgraded fuel systems. Will the stock MG fuel tank pickup handle a V8 upgrade? A 3/8" fuel line is close to the stock size. What have V8ers found?
I think a mild carburated V8 will not be a worry but high horse power FI's might get starved.


rficalora
Rob Ficalora
Willis, TX
(2764 posts)

Registered:
10/24/2007 02:46PM

Main British Car:
'76 MGB w/CB front, Sebring rear, early metal dash Ford 302

authors avatar
Re: Fuel System Opinions.
Posted by: rficalora
Date: March 12, 2008 12:35PM

I'll be interested to see what others say. I talked with a couple of folks with Ford 302's & indication I got was stock pickup allowed plenty of flow.


BMC
Brian Mc Cullough
Forest Lake, Minnesota, USA
(383 posts)

Registered:
10/30/2007 02:27AM

Main British Car:
1980 MGB '95 3.4L 'L32' SFI V6, GM V6T5 & 3.42 Limi

authors avatar
Re: Fuel System Opinions.
Posted by: BMC
Date: March 12, 2008 02:57PM

Fuel injection: 3/8 line to system, 5/16" line return- constant flow.

Most carbs on cars under a given BHP, Lets say under 300(?): Dead headed fuel flowing in one direction, never a drop in pressure Should be able to use a 5/16" feed line.

Correct me if I am wrong, but quite a few high BHP cars with 3.8 feed line to a FI motor run pretty good. These are minimums. Also, if you go with a 3/8" line to the front, the tank line is a 5/16" so its a bit of a bottle neck, but again, i dont think you need to worry. We have pulled FI motors out of this without issue due to size.

-BMC.
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scot abbott
scot abbott

(26 posts)

Registered:
01/30/2008 06:03PM

Main British Car:
Re: Fuel System Opinions.
Posted by: scot abbott
Date: March 25, 2008 12:12AM

According to Poisueille's equasion, flow resistance at constant pressure goes up by the FOURTH POWER of the tubing radius. A 3/8 diameter tube has 1/2 the flow resistance per foot that 5/16 inch tube has. Thus it is clear that tubing diameter is much more important than length.
If you have any question about the fuel supply capability, simply measure it. One smart measurement is worth far more than a bunch of dumb conjecture.


kstevusa
kelly stevenson
Southern Middle Tennessee
(985 posts)

Registered:
10/25/2007 09:37AM

Main British Car:
2003 Jaguar XK8 Coupe 4.2L DOHC/ VVT / 6sp. AT

authors avatar
Re: Fuel System Opinions.
Posted by: kstevusa
Date: March 27, 2008 07:29PM

just cked the web-site Hardcore 5.0 and they have fuel pump calcuator using the flywheel HP. accordingly, a 315 FWHP car (my is in this range (266RWHP), it take 25.4 gal/hour WOT. i have both 5/16" pressure and return with no problem. the system is Ford EFI with a Kirban Adj. pres. reg @39 PSI. my pump will a GM Module from a 99 Malibu with a capacity of 30 gph. it can be upgraded to larger pump if needed. the new system is almost ready to fire up. Brian, did you complete you GM module system?


BMC
Brian Mc Cullough
Forest Lake, Minnesota, USA
(383 posts)

Registered:
10/30/2007 02:27AM

Main British Car:
1980 MGB '95 3.4L 'L32' SFI V6, GM V6T5 & 3.42 Limi

authors avatar
Re: Fuel System Opinions.
Posted by: BMC
Date: April 11, 2008 12:21PM

Kelly, are you asking me? If so I am not sure exactly what your asking...

-BMC.


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