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Walbro 255 Installation DIY

  #16  
Old 12-06-2007, 11:30 AM
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I have an 03 coupe and my installation was a little different. I'm not sure if the assemblies are different between the sedan and coupe. But mine was way different then yours for these aspects:

- Fuel pump is placed off to the side in its own section (not centered like yours)
- I did not have a jet pump (that was connected to any hoses at least)

Mine looks like this:



Just some input for people that may run into not having the same fuel bucket assembly as you.
 

Last edited by G35Asian; 12-06-2007 at 11:33 AM.
  #17  
Old 12-07-2007, 11:24 AM
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Wow! That is really different. Did you put a Walbro in yours? If so, is the bottom of the bucket where the little nib sticks out of the fuel pump the same?
 
  #18  
Old 12-07-2007, 11:58 AM
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Thanks, you just saved me some money.
 
  #19  
Old 12-07-2007, 12:41 PM
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Originally Posted by sliderg35
Wow! That is really different. Did you put a Walbro in yours? If so, is the bottom of the bucket where the little nib sticks out of the fuel pump the same?
No, it is way different. All you have to do is shave off the tabs on the walbro, cut the rubber washer to fit around the bumps, and install the pump as if you were reinstalling the stock one. A little simpler then the fuel bucket assembly that the OP was using for this DIY.
 
  #20  
Old 01-07-2008, 02:31 PM
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Excellent post! Thanks Slider! I'm going to be doing this soon. . .

Can a mod please sticky this?
 
  #21  
Old 01-07-2008, 04:59 PM
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WOW where was this six months ago when I installed one in a coupe lol. Nice write up
 
  #22  
Old 03-15-2008, 03:28 AM
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nice job
 
  #23  
Old 03-15-2008, 04:09 AM
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wow....like the most complete/best write up i have seen good just..
 
  #24  
Old 07-29-2008, 10:44 PM
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How come my pump container(white) is different? The pump actually draws out of the container. Im having a hard time installing this walbro because it dooesnt fit right.
03' coupe
Any write ups for mine?
Thanks,

~Dv8
 
  #25  
Old 07-31-2008, 03:23 AM
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just out of curiousity, does the replacement of the pump actually end up helping the volume of fuel the motor actually sees?

With it being a returnless system, the fuel system is essentially voltage regulated and once you start to max out the pump in the factory systems, its my understanding that the pump circuits are getting overloaded and shutting down. now i could be completely off on this and if i am, please correct me.

By putting in a larger pump, i dont see the ecu being able to understand there is a larger volume pump in the car and it will still and suffocate the pump electrically? Did you upgrade the fuel pump circuit with a external 30amp relay and larger guage wiring, while installing the pump?

Either way, good on you guys for the DIY, helps others in this perdicament with a boosted VQ.

ps slider: did you ever head back to the dyno after the one i met ya at zensport? i was the guy that talked to you about your headers with the 03 DG coupe.
 
  #26  
Old 07-31-2008, 06:04 PM
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GJ! Thats looks different from mine too, did you drill out the regulator?
 
  #27  
Old 08-07-2008, 03:16 PM
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Originally Posted by Dv8
How come my pump container(white) is different? The pump actually draws out of the container. Im having a hard time installing this walbro because it dooesnt fit right.
03' coupe
Any write ups for mine?
Thanks,

~Dv8
I was sold the wrong fuel pump!!! I got the correct one and installation using this DIY was a breeze.

Thanks.

~Dv8
 
  #28  
Old 08-12-2008, 12:50 PM
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Originally Posted by Jpalta01
just out of curiousity, does the replacement of the pump actually end up helping the volume of fuel the motor actually sees?

With it being a returnless system, the fuel system is essentially voltage regulated and once you start to max out the pump in the factory systems, its my understanding that the pump circuits are getting overloaded and shutting down. now i could be completely off on this and if i am, please correct me.

By putting in a larger pump, i dont see the ecu being able to understand there is a larger volume pump in the car and it will still and suffocate the pump electrically? Did you upgrade the fuel pump circuit with a external 30amp relay and larger guage wiring, while installing the pump?

Either way, good on you guys for the DIY, helps others in this perdicament with a boosted VQ.

ps slider: did you ever head back to the dyno after the one i met ya at zensport? i was the guy that talked to you about your headers with the 03 DG coupe.
You can see the effect of having a higher volume pump when you go to do the tune. I was only having trouble at the higher end when the pump was maxed out. The A/F ratio started going up at 6K RPM when my injectors were maxed out. Now there is enough pressure so the injectors aren't maxed out until 6800 and I could fix that with bigger injectors. (but I rarely go over 6,000 RPM so I'm not in a hurry to switch injectors)

I didn't go back to re-dyno because I wasn't really impressed with their work. They only adjusted fuel and completely ignored timing. I have all the tools to do it myself now anyway.
 
  #30  
Old 08-25-2011, 10:33 PM
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So I did the install and my fuel gauge isn't working..I didn't trim the "bump" on to the new fuel pump. Think that's y the gauge isn't working? Is my fuse bad? I didn't remove it or anything.
 

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