FUEL PRESSURE... FUEL PUMPS.

[JRCivic]

It is true... right now, I am testing with the OE regulator removed, and there is a dead spot in low vaccuum... almost a random sputter while holding highway speeds.


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'93 Civic Si H/B with B18C1, JRSC @ 8psi
Best 1320: 12.68 at 110 mph

[civic13]

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by JRCivic:
For those who aren't sure of what pump they have mounted in their tank... do this test.

BOTTOM OUT THE JR FMU:
Loosen the 1/2" jam nut on the FMU and using a 3/16" hex key, turn the adjustment screw ALL of the way in. This will close the fuel return line and the pump will stop delivering fuel when it reaches its maximum flow rate. The GSS-317 (Low press) stops at about 85psi. The GSS-342 (high press) stops at about 115-120psi.
Now, don't forget to return the adjustment screw back to your original baseline settings. (60 psi is a good start... it is the factory setting)<HR></BLOCKQUOTE>

Jim, is this with all the lines hooked up or do you take off the vac line and plug it??


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[SteveW]

How old are these posts? Are the dates correct? So that means the Zdyne unit should have been released last summer? Any new developments on it?

Steve

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Steve
97 GSR SC
All go and little show

[A-dub5513]

Most of us here regard the GSS-317 as the "low oupt" pump while the GSS-342 as the "high output".

I was referred to a site that sells pumps with conflicting info on three pump models. The first is the lowest output pump flowing 190 ltr/hr that gives up at about 90 psi as JRCivic stated above.

Here's what's funny. The second pump which is a "regular" 255 ltr/hr pump which, according to the site's flow chart (derived from info from Walbro) only flows to 100. Then lastly, they have a third "high output" 255 ltr/hr pump that flows to about 110psi.

Now I'm not trying to split hairs here and I'll likely be picking up the "high output" version of their 255 ltr/hr pump, but what's the dillio?

I believe some of you purchased your pumps from this guy but I don't remember there ever being three models mentioned, or high/low models of the 342's to be specific, which raised my curiosity.

Any input? No biggie..just curious.

[JT98CivicEX]

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by 5 Liter Eater:
Shouldn't matter as turning down the allen screw all the way is blocking the return line to the tank.

<HR></BLOCKQUOTE>
Another quick method to test the max pump pressure per Corky Bell at Cartech is temporary clamp the fuel line with a plier. I think the instruction came with the my Cartech 2020.



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JT

[2kbill]

Yep, this thread took a year and a half nap, and started back up on first crank.

This board rocks!



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2000 GSR, JRSC@6psi, JR MAP, Kami/Carsound, ITR catback, rear sway & LSD, ACT HDSS, 11 lb. FW, Injen 3" CAI, Koni Yellows & Eibach ProKit.
[email protected]

[5 Liter Eater]

Shouldn't matter as turning down the allen screw all the way is blocking the return line to the tank.

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Bill Winters
'94 GSR w/ JRSC @ 9 PSI via ENDYN stepper pulley, Cartech 20005, Vortech fuel modifier, RC 310's, AEM fuel rail, 2.5" test pipe, Hotshot 3" short ram intake and homemade CAI, Clutch Specialties Stage 2

[JRCivic]

I am not sure which graphs you are looking at... however, the information that you have quoted is INCORRECT for the models that JR and I sell.

The GSS-250 is a 190 lph pump and its flow stops around 110 psi of fuel pressure.
The GSS-317 is a 255 lph pump and its flow stops around 90 psi of fuel pressure.
The GSS-342 is also a 255 lph pump... however, its flow doesn't stop until it reaches about 130 psi of fuel pressure.

I hope that this helps.


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Motorvations Motorsports
(205) 661-3600
'93 Civic Si H/B with B18C1, JRSC @ 8psi
Best 1320: 12.68 at 110 mph

[Marc]

Some of the DSM guys did some research and this is what they found.Maybe this link will help a little:
http://www.vfaq.com/mods/Walbro-specs.html

Please note it was also found that voltage directly affects the amount of flow a fuel pump can put out. By hardwiring your fuel pump using 10 gauge wiring you can dramatically increase the performance of your fuel pump, even your stock pump!

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Marc
Want to know why I got rid of the JRSC? http://crx.honda-perf.org/horror/jrsc.html

Coming soon: A new member to the 12 second club.