Lucky_Smurf

Ok this maybe a stupid question but I'm going to ask it anyway. I'm needing a new fuel pump and my setup is as follows. B18c 84mm golden eagle sleeves 9.8:1 endyn pistons, manley rods, 880cc precision injectors, hondata, sx adjustable fpr, full race t3/67 .82 ar. built head. I've been looking at the walbro's and found two and I'm not sure what the difference is:

GSS317 (400-846) Civic / Del Sol 1992-00 255lph
GSS342 (400-846) Civic / Del Sol 1992-00 255lph-HP

So which one?

theo99gsr

get the High Pressure one

Adr!an

Which two did you find??

Lucky_Smurf

They are listed in the first post.

SWC

Little off the topic.
Is the 342(high pressure) noisier/louder than regular 255lph pump? I have a HP pump and it sounds noisy.

Sketch_hs

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SWC &raquo;</TD></TR><TR><TD CLASS="quote">Little off the topic.
Is the 342(high pressure) noisier/louder than regular 255lph pump? I have a HP pump and it sounds noisy. </TD></TR></TABLE>

i can hardly hear it... but i do have full interior.

SWC

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Sketch_hs &raquo;</TD></TR><TR><TD CLASS="quote">

i can hardly hear it... but i do have full interior.</TD></TR></TABLE>
I have a regular 255lph pump in my WRX and it is much quieter than HP pump in my Civic. I bought HP pump just because same price with the regular one.

BlueShadow

Lucky_Smurf,

It sounds like you are running a serious setup there. If you are planning on running lots of boost then you'll want a HP pump. Increased fuel pressure lowers the fuel pumps flow capability, but the HP pump can deliver more fuel at higher pressure then the regular pump.

BUT sine you are running such a complex turbo setup and are probably planning on making lots of power you might wanna get a better pump. Not sure if you are willing to run a sumped fuel tank, but if you are the Aeromotive A1000 pump might be something you wanna look at. If you wanna stick to an intank fuel pump, I dont know what brands are better then Walbro. Maybe somebody else can post up better pump brands other then Walbro.

HiProfile

Here's the deal: The HP pump can support more flow (~5gph) at the same pressure up to ~50psi (most an NA car would usually see), which is where they break away from each other. With both at 65psi (IIRC, maybe a bit more), the HP is flowing twice the GPH than the normal 255gph pump.

As for noise, it depends. I would think a newer wrx has much more sound barriers than most any civic. I bought the HP because I was going to run 450's to their max next year, but I decided to get some 780's I found for a good price. At least on my car, the fuel pump isn't sticking right into the cabin.


If you're going to run smaller injectors with quite a bit of power, go with the HP. If you get larger injectors and never break 400whp, go with the normal 255gph.

SWC

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HiProfile &raquo;</TD></TR><TR><TD CLASS="quote">If you're going to run smaller injectors with quite a bit of power, go with the HP. If you get larger injectors and never break 400whp, go with the normal 255gph.</TD></TR></TABLE>
I'm confusing about your statement. Go with higher flow pump for smaller injectors and lower flow pump for larger injectors?

BlueShadow

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HiProfile &raquo;</TD></TR><TR><TD CLASS="quote">Here's the deal: The HP pump can support more flow (~5gph) at the same pressure up to ~50psi (most an NA car would usually see), which is where they break away from each other. With both at 65psi (IIRC, maybe a bit more), the HP is flowing twice the GPH than the normal 255gph pump.

As for noise, it depends. I would think a newer wrx has much more sound barriers than most any civic. I bought the HP because I was going to run 450's to their max next year, but I decided to get some 780's I found for a good price. At least on my car, the fuel pump isn't sticking right into the cabin.


If you're going to run smaller injectors with quite a bit of power, go with the HP. If you get larger injectors and never break 400whp, go with the normal 255gph.</TD></TR></TABLE>

yah I'm with SWC...your last statement is kinda confusing. The high pressure pump should be used if you are going to run a lot of boost. The boost pressure affects the fuel pressure if you are running a 1:1 rising rate FPR (ie stock FPR and most aftermarket FPR's). So if you are planning on running say 20 psi then you have to factor that into your overall fuel pressure at WOT. Then you have to figure out if your base fuel pressure+boost pressure allows the pump to flow enough for your HP goals. The regular pump should be ok if you are running low boost, and if you have an adjustable FPR you can lower the fuel pressure to get more flow out of the pump. Since the HP pump is only $10 more then the regular pump so might as well get the HP pump "just in case".

One other thing too, the Walbro pumps are rated in LPH not GPH. It's not a 255GPH pump, it's a 255LPH. I believe the pumps are rated at 44-45 psi of fuel pressure where they flow 255LPH, and 255LPH is roughly 55-56GPH.

http://www.lightningmotorsport...h.htm