1994 Cobra fuel pump limitations?

94' Cobra 351 · February 12th, 2009, 01:19 PM

I was wondering how much power a stock 94' cobra fuel pump will support?

I think they are 155gph? Or is it lph?

I'm going to be throwing a 125 shot of nitrous on the 351, and am wondering if the stock fuel pump will support it.

Thanks!

it's a wet kit, by the way.

flamedstang95 · February 12th, 2009, 01:38 PM

Your stock cobra pump isn't working as good now 15 yrs later as it did back in '94. That being said just get yourself a 255lph pump and call it done. You will see a HUGE difference in the way your car runs after the swap. I can promise you that. I bought my FP for 100 bucks.

94' Cobra 351 · February 12th, 2009, 01:40 PM

How much power will a 255lph support?

flamedstang95 · February 12th, 2009, 01:57 PM

I'm not sure on the exact numbers it will support. There are many guys with blown applications running the same pump so I think it's a safe bet to say you're okay. I think you have to be more concerned with your injector's supporting it. What injectors are you running? FYI, most of the fuel pumps out there are made by Walbro so don't pay extra for a trick flow, bbk, holley etc. When you open up the box it's still going to be a Walbro. Summit lists them for 119.00 You might want to check out Arts Performance and see if he can get you one for around 99.00 shipped. Great guy to deal with BTW!

efulton95 · February 12th, 2009, 01:59 PM

not trying to steal the thread but if he were to get a 255 would he need bigger injectors too if he doesnt have them already? or would the stockers be ok?

94' Cobra 351 · February 12th, 2009, 02:03 PM

I have 24# injectors, which might be too small for my 5.8, but doesn't matter for the nitrous kit since it is a wet kit.

To answer your question, no, you don't need different injectors when you swap pumps.

WildWill · February 12th, 2009, 09:39 PM

I swapped to a 255lph pump and still have the stock injectors... the fuel pump made a HUGE difference, as flamedstang95 said...

I guarantee you're starving your motor with that stock pump. It's totally worth it to swap out the pump. Oh and while you're in there, its a good time to put a new fill neck gasket in. You can only get them at ford for about $40. Guarantee yours will be leaking once you pull the tank out.

efulton95 · February 12th, 2009, 10:25 PM

What kind of difference would I expect you say huge but what exactly would it do? In all of the reciepts the previous owner of my car gave me there is one for a new fuel pump but there is no part number or description so I guess I will email him and see if he had a stock one put in. Unless there is an easy way to tell

White Thunder · February 12th, 2009, 11:22 PM

its not going to be a huge differnece.....but i would highly recomend it

Traidmarx · February 12th, 2009, 11:37 PM

its not really a noticable difference if you're car is stock or mostly stock with stock injectors, I just put a Walbro 255lph in my car, not a real noticable difference except the car starts alot easier, thats about all i've noticed really. But you have the peace of mind knowing that if you ever need to step up the injectors to support the power that the pump will be solid.

flamedstang95 · February 13th, 2009, 02:34 AM

Originally Posted by 94' Cobra 351

I have 24# injectors, which might be too small for my 5.8, but doesn't matter for the nitrous kit since it is a wet kit.

To answer your question, no, you don't need different injectors when you swap pumps.

You are probably at the max duty cycle on those injectors. +1 on the filler neck gasket as well.

WildWill · February 13th, 2009, 10:24 AM

Originally Posted by Traidmarx

its not really a noticable difference if you're car is stock or mostly stock with stock injectors, I just put a Walbro 255lph in my car, not a real noticable difference except the car starts alot easier, thats about all i've noticed really. But you have the peace of mind knowing that if you ever need to step up the injectors to support the power that the pump will be solid.

spot on....

94' Cobra 351 · February 13th, 2009, 11:18 AM

Thanks for the info, but does anybody know the limitations of the 255lph pump? Any good links for fuel pump limits?

flamedstang95 · February 13th, 2009, 01:34 PM

If I ever get unbanned from Web Page Re-director I can find the answer for you. You might want to register over there and check out the 94/95 tech. I can't find the exact #'s.

White Thunder · February 13th, 2009, 04:15 PM

i read some where they wont support more than 60lb injectors....i think...i would like to know the anwser to this as well

February 12th, 2009, 01:19 PM	#1
94' Cobra 351 Regular Join Date: Dec 2006 Posts: 480 iTrader: 0 reviews	1994 Cobra fuel pump limitations? I was wondering how much power a stock 94' cobra fuel pump will support? I think they are 155gph? Or is it lph? I'm going to be throwing a 125 shot of nitrous on the 351, and am wondering if the stock fuel pump will support it. Thanks! it's a wet kit, by the way.

February 12th, 2009, 01:38 PM	#2
flamedstang95 Regular 1995 Mustang GT Join Date: Jan 2008 Location: Magnolia, DE Posts: 386 iTrader: 0 reviews	Your stock cobra pump isn't working as good now 15 yrs later as it did back in '94. That being said just get yourself a 255lph pump and call it done. You will see a HUGE difference in the way your car runs after the swap. I can promise you that. I bought my FP for 100 bucks. __________________ See garage for mods

February 12th, 2009, 01:57 PM	#4
flamedstang95 Regular 1995 Mustang GT Join Date: Jan 2008 Location: Magnolia, DE Posts: 386 iTrader: 0 reviews	I'm not sure on the exact numbers it will support. There are many guys with blown applications running the same pump so I think it's a safe bet to say you're okay. I think you have to be more concerned with your injector's supporting it. What injectors are you running? FYI, most of the fuel pumps out there are made by Walbro so don't pay extra for a trick flow, bbk, holley etc. When you open up the box it's still going to be a Walbro. Summit lists them for 119.00 You might want to check out Arts Performance and see if he can get you one for around 99.00 shipped. Great guy to deal with BTW! __________________ See garage for mods

February 12th, 2009, 09:39 PM	#7
WildWill Hardcore Enthusiast 1995 Mustang GT Join Date: Oct 2007 Location: Solomons, MD Posts: 1,112 iTrader: 0 reviews	I swapped to a 255lph pump and still have the stock injectors... the fuel pump made a HUGE difference, as flamedstang95 said... I guarantee you're starving your motor with that stock pump. It's totally worth it to swap out the pump. Oh and while you're in there, its a good time to put a new fill neck gasket in. You can only get them at ford for about $40. Guarantee yours will be leaking once you pull the tank out. __________________ GT40p heads, 1.7 crane RR's, GT40 u/l, MAC LTs, MAC o/r h-pipe, Flowmaster 40s, 65mm t/b, '03 Cobra Bilstein Struts, Tokico Bullitt Shocks, MM c/c plates, Eibach Sportlines, B&M shifter, 255lph f/p, RAM p/g clutch, Fidanza alum fly, rebuilt t-5

February 12th, 2009, 11:37 PM	#10
Traidmarx Hardcore Enthusiast 1995 Mustang GT SLOWER THAN OLD PEOPLE FUCK..:-( Join Date: Aug 2008 Location: Roanoke,VA Posts: 2,075 iTrader: 0 reviews	its not really a noticable difference if you're car is stock or mostly stock with stock injectors, I just put a Walbro 255lph in my car, not a real noticable difference except the car starts alot easier, thats about all i've noticed really. But you have the peace of mind knowing that if you ever need to step up the injectors to support the power that the pump will be solid. __________________ 1995 Mustang GT..4.30's,BBK Longtubes, Off Road X-Pipe,Magnaflow Catback,BBK Intake,BBK Underdrive Pulleys Walbro 255lph pump,accel dizzy,MSD Coil,MSD 8.5 Super Conductors,front sway bar removed, more coming soon.

February 12th, 2009, 01:40 PM	#3
94' Cobra 351 Regular Join Date: Dec 2006 Posts: 480 iTrader: 0 reviews	How much power will a 255lph support?

February 12th, 2009, 01:59 PM	#5
efulton95 Regular 1995 Mustang GT slower than a 3 leg dog Join Date: Oct 2007 Location: Detroit Posts: 165 iTrader: 0 reviews	not trying to steal the thread but if he were to get a 255 would he need bigger injectors too if he doesnt have them already? or would the stockers be ok?

February 12th, 2009, 02:03 PM	#6
94' Cobra 351 Regular Join Date: Dec 2006 Posts: 480 iTrader: 0 reviews	I have 24# injectors, which might be too small for my 5.8, but doesn't matter for the nitrous kit since it is a wet kit. To answer your question, no, you don't need different injectors when you swap pumps.

February 12th, 2009, 10:25 PM	#8
efulton95 Regular 1995 Mustang GT slower than a 3 leg dog Join Date: Oct 2007 Location: Detroit Posts: 165 iTrader: 0 reviews	What kind of difference would I expect you say huge but what exactly would it do? In all of the reciepts the previous owner of my car gave me there is one for a new fuel pump but there is no part number or description so I guess I will email him and see if he had a stock one put in. Unless there is an easy way to tell

February 13th, 2009, 11:18 AM	#13
94' Cobra 351 Regular Join Date: Dec 2006 Posts: 480 iTrader: 0 reviews	Thanks for the info, but does anybody know the limitations of the 255lph pump? Any good links for fuel pump limits?

February 13th, 2009, 01:34 PM	#14
flamedstang95 Regular 1995 Mustang GT Join Date: Jan 2008 Location: Magnolia, DE Posts: 386 iTrader: 0 reviews	If I ever get unbanned from Web Page Re-director I can find the answer for you. You might want to register over there and check out the 94/95 tech. I can't find the exact #'s. __________________ See garage for mods

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