aeromotive 340 or walbro 255?

[jonahs_supra]

so i recently been having problems with my walbro 255
bought it 2 yrs ago for another supra but never installed
installed the pump into my 91 due to the old pump was bad(oem)
walbro has been installed for 6-7 months and i didnt do the 12v mod

the past few weeks my walbro has been getting louder and louder
last night in boost at 20psi i noticed my afr leaning out to 15:1
immediatly let off
got home and noticed my fuel pressure was long
cold start fuel pressure is 42 psi...drive to work 40 miles 1 hr my fuel pressure pulsates between 30-34 psi

anyways i have heard good and bad about the walbros

anybody have experience with the aeromotive 340?

HP goal will be 500 hopefully by the summer

thanks for any input

 

[IJ.]

Have a look at the Walbro 400, :love: mine!

 

[mytmk3]

I may aswell ask here but IJ any issues with over heated fuel? deciding on adding another 255lph to my current set up or a single 400

 

[IJ.]

I may aswell ask here but IJ any issues with over heated fuel? deciding on adding another 255lph to my current set up or a single 400

I run a stock Holden pump to an 8 litre fuel cell that has 2x 400's inside, I run a couple of Aeromotive pump controllers so at idle/cruise only 1 pump runs at reduced volume to prevent it boiling the fuel, I also run returnless so this makes a diference.

 

[mytmk3]

yup that far exceeds what I had planned for my set up haha

 

[IJ.]

I always look at what I need in a fuel system then double it

NOTHING will kill a boosted engine faster than a leanout...

 

[jonahs_supra]

would running a single 400 require bigger fuel line?

thanks IJ

 

[IJ.]

would running a single 400 require bigger fuel line?

thanks IJ

No, but I would

At least a -6.

 

[jonahs_supra]

im sure there's a lot of things you would do

contacted walbro to see if theres anything they can do for me since the pump was only used for 6 months

 

[IJ.]

Another benefit of the 400's is they're fairly new so no Copies out there... yet

I've ran a bunch of different pumps over the years and have never been as impressed by the free flow of the 400's, not even the 040 and 044 Bosch combo I ran came close to the firehose 400's

 

[jonahs_supra]

i wonder how long they will last?

i have read a bunch of threads with complaints of the life spand of walbro pumps

 

[IJ.]

Most of the "bad" I've read has been for the Copies, 400 is a Gerotor Pump head on the Smaller Walbro Motor, really quiet in operation and feels very smooth while running, ANY other pump I've tried that have this sort of volume have been Coffee Grinders..

 

[jonahs_supra]

for the price of the 400 compared to the aero 340
the 400 is ruffly $20 cheap (quick search)

im also wondering if this will work with the oem mk3 pump hanger?

 

[IJ.]

Might have to put a spacer in between the motor and the hanger as the pump head is bigger diameter.

 

[jonahs_supra]

ok i see what your saying about the pump head being bigger

ill do some more research

thanks

 

[Tura_1JZ]

Great pump, Don't forget to look at the flow rate chart to get a better idea of what your flowing at a certain psi.
Walbro 400

 

[jonahs_supra]

thanks for the chart
very helpful

 

[jonahs_supra]

Called and spoke with Jeff at Walbro Technical Support.
He seems to think i have air bubbles in my fuel filter and recommends a new fuel filter.
Im going to take his advice in the next few weeks.
New fuel filter, new strainer, clean tank good, constant 12V mod to pump and see what happens.
On my way to work today at 20psi(of boost) my AFR was a nice 11:1.
But he said if its still acting up then he can get me a new pump . I may try and squeeze a deal in with the Walbro 400 haha

 

[IndigoMKII]

Since this does pertain to the walbro 255, should the base FP be lowered on a 7mgte when switching to a walbro 255 vs the oem one? I mean lowered as in like 30-33 as opposed to 33-40 to try and help control the added flow?

 

[jonahs_supra]

Since this does pertain to the walbro 255, should the base FP be lowered on a 7mgte when switching to a walbro 255 vs the oem one? I mean lowered as in like 30-33 as opposed to 33-40 to try and help control the added flow?

no
set to factory pressure if no tuning device is used