who has replaced a fuel pump .. why?

Little Beavis said:
Added an inline (Pierburg). Stock pump couldn't support 5 psi or so. . .started to whine after hard driving.

Pierburg is great, makes a little humm, but nothing major. Allowed me to support 100 psi under boost without fade. Was able to peak about 120 to 130 psi, but couldn't hold it. . .so out went the FMU. . .but the inline fuel pump remains!
Same here! I can easily go over 100 PSI with this Pierburg! It really is a trip and 1/2!
 
paulmp3 said:
???'s tp those with inline or new pumps. Especially if you have a wideband!

How does your car idle and run in normal driving? will the car still maintain a 14.7 AFR while in closed loop?

Which one is better inline or intank??

Also links and prices!
Well, my car has always idle a little rich, but I can run 14.7 when cruising, so no problem there. I also found that with the inline, I could go to a 8:1 on the Vortech FMU, as I was obviously getting more fuel. That allowed me to turn up the boost, which was great!

I bought the Pierburg from FM. It was expensive, but it is a nice pump. I'm guessing there are cheaper ones out there that will do the same job, but the Pierburg definitely does what it needs to do.
 
shouldnt i just be able to hook up the fuel pump and if its rich im good for now? then get the meter later?
 
Matthew said:
shouldnt i just be able to hook up the fuel pump and if its rich im good for now? then get the meter later?
Yeah and no. If it is the fuel pump, yes. If it is not the fuel pump, no.

A gauge is a good buy regardless, but if money is tight then, do one at a time, because once this is "resolved" you won't have much of a use for the fuel pressure gauge. . .I look at mine because it is there, but I don't think I would miss it if it weren't.
 
well if its not the fuel pump it should be pretty obvious and then ill prolly buy a new FMU. after that i wouldnt know WHAT to do :(
 
Just to answer the question, I replaced my intank pump with a Walbro 342.

I do not know if there is a better replacement, however, I did not cut my pump holder deal up.

As for the reason why, the stocker couldn't handle the flow I needed. I watched the pressure drop as the RPMs went higher on 5 psi of boost. With the replacement, I have no issues.

I chose the Walbro for ease of installation given that I didn't feel like pulling half of my charge piping out and hacking up more fuel line to get everything set up again.

Either option will work. If I did it all over again, I would probably get the Pierburg during the install, but do thw Walbro after all is said and done after the original install.
 
StuttersC said:
Just to answer the question, I replaced my intank pump with a Walbro 342.
Whats the difference between the Walbro 342 and the Walbro 255. Which one would you use for certain applications.
 
342 is actually the part number of the high pressure, high capacity 255 LPH fuel pump for the Miata, from Walbro. 255 is simply the amount of litres per hour the pump is capable of pushing, so both are one and the same. =)
 
StuttersC said:
Just to answer the question, I replaced my intank pump with a Walbro 342.

I do not know if there is a better replacement, however, I did not cut my pump holder deal up.

As for the reason why, the stocker couldn't handle the flow I needed. I watched the pressure drop as the RPMs went higher on 5 psi of boost. With the replacement, I have no issues.

I chose the Walbro for ease of installation given that I didn't feel like pulling half of my charge piping out and hacking up more fuel line to get everything set up again.

Either option will work. If I did it all over again, I would probably get the Pierburg during the install, but do thw Walbro after all is said and done after the original install.
I didn't have to pull any charge piping out to install my Pierburg In-line pump. You just have to feed into the other side of the RRFPR. It works fine.
 
I got the Walbro, but not the high pressure version. The regular pressure version will go high enough for my needs. I have an "OEM" turbo that didn't come in the states. No idea how it runs because I can't get it to turn on with my new fuel harness!! I tested it with the stock harness and it was loud as hell, but that was pumping at full steam :) . Really easy installation.
 
YP5 Toronto said:
StuttersC, how was the install? was it straight forward? no cutting?
Pretty straight forward. I decided not to cut up the little plastic thing on the bottom as I might have a reaosn to go back to stock. So, we zip tied the snot out of it and it does not budge.

Just pull out (or up depending on wagon or sedan) the back seat, and remoce screws. Pretty easy.
 

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