Going for a re-tune.... (Round #2) Updated 10/28/13

[hotaccord243]

Re: Going for a re-tune....

ALright, so last time I was working on it, my Walbro 255lph fuel pump was going haywire as far as intermittent priming and running intermittitenly when trying to turn it over, could this be part of the problem? instead of a steady sound it was going in and out?

Also, if I already have the system wired for the walbro, and I were to switch it out for a bosch 044 inline fuel pump are they interchangeable or do I need to change some wiring?

From the sounds of the pump I may need to get a new one?

 

[Russianred]

Re: Going for a re-tune....

Not a professional on pumps, but take the pump out and test it against a battery. If it works smoothly you have another issue and your pump works fine. If it works intermittently as you say it does, then the pump may indeed need to be replaced.

I believe that an inline pump such as the Bosch you mention, and the in-tank pump such as the Walbro 255, cannot be used interchangably due to their placement. If you can somehow rig up the inline pump to function as an in-tank pump and replace the walbro, it will work but otherwise an in-tank pump is an in-tank pump and an inline pump is an inline pump. If you wanted 2 pumps however, you could use one in-tank and one inline pump totalling 2 pumps. This is my understanding, however I may not be the wisest about the issue.

As far as wiring, it shouldn't need to be altered. If you decide to run 2 pumps, just splice wires from the extra non-OEM pump into the one OEM harness. You might even be able to run individual switches on each for safety.

 

[hotaccord243]

Re: Going for a re-tune....

Well they offer both walbro and Bosch in the inline and in tank options actually. The Bosch is a little quieter, and offers a 300lph vs the Walbro 255lph which allows for more fuel, more efficiency, and quieter operation.

But you are correct they are not interchangable as in intank vs inline pumps.

I'll have to test mine, but in the meantime, i would imagine that the only thing you need is power, ground, and wiring to the AEM (in our case). Just wondering if the amperage and wiring is the same more or less.

I appreciate the response Nikita.

 

[Russianred]

Re: Going for a re-tune....

I don't think amperage would be an issue especially if you are only going to replace it and run the one pump setup - it's just a 12v powered pump/device. Even if you wanted to, you should be able to double up safely on a second similar pump/device using the same harness/wires. I don't think it would need to be wired to the AEM directly either unless you wanted to do that - because the harness for the pump in the tank is already connected to the AEM on the other end. The AEM replaces ECU etc, haha you know.

 

[akoutmos]

Re: Going for a re-tune....

The fuel pump is triggered through the ECU through a relay. A pump would require far too much amperage for the ECU to supply. In case you want to know, it's pin A16 on the ECU.

 

[Russianred]

Re: Going for a re-tune....

So if you wanted another (second) pump to work parallel with the in-tank one you'd have to add another relay correct? If yes, would you then be able to use the stock harness or would it just be best to wire it to EMS directly (and for what reasons)?

 

[akoutmos]

Re: Going for a re-tune....

You could run another pump in parallel in several different ways. If the relay is capable of running both pumps (it can support the amperage), you can wire up both the pumps on the same relay. Or you could create another trigger on the EMS and run that trigger to a relay which will power the other pump. If it is a plug and play pump (like the walbros), then you don't need to do any harness modifications. I've had the walbro for 4 years now no problem. They are pretty dependable, just a little loud . That and they are good for close to 500hp. Unless you are going past that mark will you need to step up your fuel pump.

 

[x5carl3tMurd3rx]

Re: Going for a re-tune....

also another cool upgrade that my tuner suggested is to take the power wire going into the pump and run that to a relay with a larger gauge power wire (4g or 2g) running directly from the battery. he says its amazing how big of a difference that will make.

 

[Russianred]

Re: Going for a re-tune....

What effect does that have Patrick? What difference will it make? Noise level reduction, or does it affect how the pump works?

Devin - I'd say just get the Bosch if you can fine a reasonable deal in comparison with a Walbro. Either/or will work well up to 500whp as Alex mentioned, so I wouldn't be too worried.. But Bosch sounds like it would be the better option of the two if you can get it for a deal, AND it has the STOCK in-tank fitment.. NOT the inline fitment.

Have you taken out your current pump yet and tested it on a battery?

 

[hotaccord243]

Re: Going for a re-tune....

What effect does that have Patrick? What difference will it make? Noise level reduction, or does it affect how the pump works?

Devin - I'd say just get the Bosch if you can fine a reasonable deal in comparison with a Walbro. Either/or will work well up to 500whp as Alex mentioned, so I wouldn't be too worried.. But Bosch sounds like it would be the better option of the two if you can get it for a deal, AND it has the STOCK in-tank fitment.. NOT the inline fitment.

Have you taken out your current pump yet and tested it on a battery?

Haven't gotten around testing it yet actually. Just wanted the Bosch cause i have only heard good things, and they are quieter. I think for right now i may upgrade my inline to the Bosch, and later down the road, upgrade the in tank pump to a walbro. That is, if i can find a deal on the bosch.....