Fuel pump questions

Road_Runna

10 Year Member
Dec 23, 2002
581
5
29
40
Ogden, UT
Visit site
I tested fuel pump pressure on the car today (94 GT 5.0) and am getting zero (0) pressure even tho the pump can be heard priming in the back, getting 12 volts at the 20amp fuse under the hood. The fuel shrader valve barely puddles. My rpm needle jumps slightly when i crank the motor, there is clicking at the ccrm, and car has a new fuel filter, no gas can be smelled from regulator. Car will turn over when starter fluid is sprayed into the throttle body inlett. Yes i am getting spark.
My question is would a 255 lph fuel pump be too much on a stockish 5.0.
Only big mod ive done so far is the intake manifold is a edelbrock performer.
Cylinder heads or a Kenne bell are planned out for next year if things stay the same financially.
The culprit is pointing out to be the fuel pump, strainer clogged or hoses. I wont know fully until i unbolt the tank off and look at the strainer and hoses.
I believe ive gone through the checklist posted on these forums.
So would a walbro 255lph overkill for stockish 5.0?
 
Last edited:
  • Sponsors(?)


96pushrod

Mustang Master
May 15, 2018
839
506
103
28
Savannah
A 255 has been ran on stock setups in the past without issue. Sn95s have a slightly larger fuel return which helps with the excess fuel the 255 will Inevitably pump.
If you plan on upgrading in the future it’s not a bad idea.
 

Road_Runna

10 Year Member
Dec 23, 2002
581
5
29
40
Ogden, UT
Visit site
A 255 has been ran on stock setups in the past without issue. Sn95s have a slightly larger fuel return which helps with the excess fuel the 255 will Inevitably pump.
If you plan on upgrading in the future it’s not a bad idea.
Good to hear.
i really din't think of compatibility issues when i purchased the pump.
Basically i ordered it first thinking the regulator will regulate how much and then drain back to tank, that was my thinking to begin with on my stockist 5.0L.
It should be here Tuesday along with my fuel filler floater. I just got my new tank today.

I do believe i have bad gas in there, seen some jelly looking sludge dripping out of my new fuel filter.
 
Last edited:

96pushrod

Mustang Master
May 15, 2018
839
506
103
28
Savannah
If you disconnect the lines at the Rail and tank you can blow them out with compressed air. That then cycle the key a few times with the rail still disconnected to clean a bit more.
 

General karthief

wonder how much it would cost to ship you a pair
Mod Dude
Aug 25, 2016
17,333
5,597
193
polk county florida
Disconnect the fuel lines on the passenger side of the engine, connect rubber hoses to them and direct them into a small bucket or catch pan then blow them out with compressed air. The rest of the fuel lines on the engine can be removed and cleaned. If there is a lot of goo in there then I would get the injectors tested too.
JMO and not based on any real mechanical experience.
 

Road_Runna

10 Year Member
Dec 23, 2002
581
5
29
40
Ogden, UT
Visit site
Finally got her running.
I found the rubber "S" hose with a crack on it, only after ordering all my parts in the mail. New tank, new fuel gauge, walbro 225lph pump and seals.
Installed everything except the new pump, i figured the old one would still be good to use; i was wrong.
2nd time pulling the tank down; i installed the walbro pump, fired right up. Pushing down on the shrader valve, gas goes so high it actually hit under the hood.
Pump isn't quiet at all! Which is what i like, makes thing sound like there's something evil coming up.
 
Last edited:

jozsefsz

5 Year Member
Aug 11, 2013
1,147
272
114
49
Cleveland OH Area
I guess that depends on what you're comparing it to - a nice rumbly exhaust for example. The Walbro is definitely a bit buzzier than the stock unit, which is already buzzy when standing outside the car.
 

Road_Runna

10 Year Member
Dec 23, 2002
581
5
29
40
Ogden, UT
Visit site
I guess that depends on what you're comparing it to - a nice rumbly exhaust for example. The Walbro is definitely a bit buzzier than the stock unit, which is already buzzy when standing outside the car.
I can testify to the walbro being a bit louder than stock. Although i only have about 2 or gallons of fuel in the tank.
My stock pump seals might of been bad, but it was still trying to push fuel thru, just not as much as it should.
Walbro is a atleast 20% louder than stock. On 2 or 3 gallons of fuel.
 

96pushrod

Mustang Master
May 15, 2018
839
506
103
28
Savannah
I can testify to the walbro being a bit louder than stock. Although i only have about 2 or gallons of fuel in the tank.
My stock pump seals might of been bad, but it was still trying to push fuel thru, just not as much as it should.
Walbro is a atleast 20% louder than stock. On 2 or 3 gallons of fuel.
I’ve ran numerous in tank fp sizes and never noticed any being all that loud. Hell even my aeromotive a1000 really isn’t bad at all when the car is running.
 

revhead347

My mission is to out curmudgeon you
15 Year Member
Jun 14, 2004
8,250
1,125
214
40
Acworth, GA
I’ve ran numerous in tank fp sizes and never noticed any being all that loud. Hell even my aeromotive a1000 really isn’t bad at all when the car is running.
Agreed. The difference in noise between any of the in tank pumps is going to be negligible. Now, my old school in line T-Rex is a whole other story.

Kurt
 
Thread starter Similar threads Forum Replies Date
W Fuel pump question Fox 5.0 Mustang Tech 1
F Fuel 1992 Mustang GT 5.0- Fuel pump question Fox 5.0 Mustang Tech 3
santos fuel pump question 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 8
4 Intro/questions Fox 5.0 Mustang Tech 9
S Stroker Build Questions 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 47
S Fuel Fuel Pump Question SN95 V6 Mustang Tech 0
SlowFiveOh Question Relating To Fuel Pump Failure/blown Headgasket Fox 5.0 Mustang Tech 10
B Fuel Pump Question 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 1
B 5.0 Swap Fuel Pump Wiring Question? Please Help! Fox 5.0 Mustang Tech 4
C 98 Gt Fuel Pump Question SN95 4.6L Mustang Tech 3
S Electrical Another No Power To The Fuel Pump Question Fox 5.0 Mustang Tech 1
traewolfe Fuel Pump Question 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 10
86lxhatch Stock Fuel Pump Question Fox 5.0 Mustang Tech 1
B stock fuel pump limit. and p.i head porting question SN95 4.6L Mustang Tech 5
Bob Hughes Fuel pump question SN95 4.6L Mustang Tech 1
C Fuel pump wiring question Fox Engine Swaparoo 1
83Zombie question about spark plugs and fuel pump.( upgrades) Fox 5.0 Mustang Tech 2
jpplaw Question about GT500 Fuel Pumps 2005 - 2009 Specific Tech 4
2 02 GT Fuel Pump Question SN95 4.6L Mustang Tech 6
NIKwoaC Fuel pump install questions! Fox 5.0 Mustang Tech 11
M Carb'd Fuel Pump Question Fox 5.0 Mustang Tech 6
barthel Fuel pump question 1994 - 1995 Specific Tech 4
G Fuel Pump Surprise, Gravity, and Other Questions Classic Mustang Specific Tech 4
V Got a Fuel Pump question SN95 4.6L Mustang Tech 7
S fuel pump questions 1994 - 1995 Specific Tech 3
H Quick Fuel Pump Question Fox 5.0 Mustang Tech 2
M Mechanical Fuel Pump Question Fox 5.0 Mustang Tech 5
Jamee 3.8 To 5.0 Fuel Pump/Regulator Question 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 2
MikeR351w Fuel pump cut-off switch - HELP with simple question! Fox 5.0 Mustang Tech 2
5.0Torx Question on fuel pump / bad ecu Fox 5.0 Mustang Tech 8
GOLDENPONY Fuel Pump/Sender Questions '06 GT 2005 - 2009 Specific Tech 13
MyBloodRunsBlue stock fuel pumps question SVT Tech Forum 0
5 carb electric fuel pump question Fox 5.0 Mustang Tech 10
B fuel pump question. Fox 5.0 Mustang Tech 34
keepinitril just a fuel pump question Fox 5.0 Mustang Tech 7
MY 85 GT Fuel pump question? 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 2
MeanMustang Fuel pump assembly question... Fox 5.0 Mustang Tech 1
P Brief question about mechanical fuel pump install Classic Mustang Specific Tech 14
Blackone51 Fuel pump upgrade questions on 98 gt 1996 - 2004 SN95 Mustang -General/Talk- 1
P 98 Gt - Vortech Fuel Pump install question SN95 4.6L Mustang Tech 0
68dustin electric fuel pump questions Classic Mustang Specific Tech 11
vertigasen Fuel Pump question SVT focus (maybe) SN95 4.6L Mustang Tech 10
Cobra_Dusten Fuel Pump and MAF questions Fox 5.0 Mustang Tech 13
Texstang9682 question about upgrading fuel pumps SN95 4.6L Mustang Tech 6
S fuel pump question please help Fox 5.0 Mustang Tech 1
J noob fuel pump/injector question Fox 5.0 Mustang Tech 4
93GTosu quick fuel pump question Fox 5.0 Mustang Tech 4
derrick gil Fuel pump question Fox 5.0 Mustang Tech 4
JC6715 Mechanical fuel pump lever question Classic Mustang Specific Tech 1
Dagz BBK 255 lph Fuel Pump Question 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 2
Similar threads