what "filter" or "bag" or "sock" are you using on your pump the stock fuel pump one or the one provided with the walbro pump kit? maybe using the stock one is making the pump work to hard and its heating up quickly...

I have used the stock sock with my previous walbro pump on my comptech setup now on my new walbro ( I sold the other pump with the kit ) I am using the walbro sock, don't really know why I did it I just did, I can't say I notice a difference ( no fp gauge yet ) but the pump still wines the same as my previous one

....I do however want to rewire my fuel pump ( as some of you have done ) because with my direct port setup theres that split mila second of lean spike when the nitrous comes on when I got it tuned my tuner tried to correct it and did to an extent but you can only add so much fuel to the injectors etc before you just run out of fuel in the lines, so I'm thinking rewiring the pump will help keep the pressure up and steady so theres no a big strain on the fuel system when the nitrous comes on

 

I believe I'm using the stock sock, I thought I remember reading the walbro sock will get in the way of the fuel level sensor and cause errors in the reading.

 

If your fuel pressure before pulling the vacuum source from the FPR is 49 psi (should be about 59 psi without the vacuum source) and you run 21 psi of boost, your end fuel pressure is 80 psi and this is right at about the max output of the Walbro pump. It could be that your stock FPR is starting to have problems and maybe its not the pump. Try getting a new stock FPR or borrow one from a friend with an S. Or you could get an adjustable AEM FPR so you can lower you base pressure and see if your problems go away. You will have to retune the A/F's though if you go with the AEM FPR and lower your base pressure but this would be much easier than swapping out another pump. Its hard to imagine that two genuine Walbro pumps have already given you problems like this. I would bet that its something else like the FPR or possibly is the Walbro pump from running it at its max output.

 

I HAVE A SPARE REGULATOR, YOU PAY THE SHIPPING AND ITS YOURS....

 

With vacuum its 49psi, without it was 56psi. Might have to look into a FPR...

 

^^Yeah, something doesnt sound right there and it may be the FPR. When you pull the vacuum source, it should go up at least 10 psi. This may be your problem if its only going up 7 psi when you pull the vacuum.

 

Mine didn't seem to get in the way and hasn't given me any odd readings?

 

Hm, I thought I recall reading that somewhere on the forums. Regardless, I installed the pump 1-2 years ago so I can't really remember what I did

 

Checked voltages, all seems well but then again my pressure isn't sagging. I'm going to go for a long hard drive tomorrow (oh the pain ) to get it to loose pressure and remeasure the voltage at the pump.


BTW, I checked my gauge, it's really reading 350Kpa at idle which = 51psi with vacuum. Honda manual states I should be at least 10psi less? It says if your pressure is above this check for a clogged return line. Has anyone had a clogged return line?

EDIT: Evans stated that the base pressure should be 50-55psi (does base = vacuum?) so looks like cold, anyway, pressure is ok...

BTW does adding the walbro change the fuel pressure from using an OEM pump? I'm wondering if these numbers are valid when we arn't even running the same pump.

 

Base pressure from Evans statement at 50-55 psi would be without vacuum. Should be around 40-45 with vacuum. I believe the exact psi is 43.5 with vacuum.

I'm not too sure about the walbro changing the fuel pressure over the OEM unit, but I would assume it would be the same. Its just the Walbro can push more psi and volume of fuel over the OEM pump when pushing it to higher psi's.