Fuel Pump Upgrade Guide
permission of Jeff Lucius)
(This page has been modified,
original page can be found
Editor’s Note: This
article was written by Jeff Lucius, a Dodge Stealth owner and is directed to
the Stealth/3000GT community. All references to “stock” sizes for pumps &
injectors are for the Stealth engine, however the information and test data
provided in the article will be of interest to the Supra community.
11V: up to 360 cc/min
up to 450 cc/min
13.5V: up to 550
14V: up to 600 cc/min
up to 750 cc/min
18V: up to
Mach V sells the
Buschur Racing Upgrade Pump that is a direct drop-in replacement with a claimed
capacity of 369 lb/hr at 70 psi line pressure, or about 231 liters (61 gallons)
per hour at 70 psi (there is no mention of supply voltage). This pump must be
the Supra Turbo pump.
The Cosmo pump performs similar to the Walbro 341
pump and would be good for 550 cc/min injectors only if 13.5 volts or more are
supplied to the pump. Otherwise, it is safe to use with 450 cc/min injectors.
The Cosmo pump, or Denso 195130-0771, is sold by HKS with their part number
1407-001US. For many years this pump was advertised by retailers with a rating
of “340 lph, 165 psi” or “90 gph, 165 psi”. I am not sure what that means. The
Cosmo pump might flow 340 lph at 0 psi line pressure and 13.5 volts. But it only
flows about 260 lph at 43 psi and 13.5 volts. HKS now advertises this pump on
their web page http://www.hksusa.com/products/?id=717 with a rating of 71 gph
at 45 psi (no voltage listed) and a suggest retail price of $835 (wow!). This
might be about right for the Cosmo pump at 14 volts – 269 lph at 45 psi. From
the RCE pump tests, it looks like the relief valve for the Cosmo pump is set at
about 90 psi, so I’m not sure what the “165 psi” in the old advertisements
The pictures below are of the pump that was sold to me as “same
as the HKS 90-gph pump”. The part numbers were ground off, but I installed it
anyway in the Spring of 2000. On March 13, 2001 I removed the fuel pump from my
tank and inspected the ground-off numbers with a 10-power hand lens. The
remnants of “1020″ can still be seen. This pump is the Toyota Supra Turbo fuel
pump. I sent this pump and the old stock one to RC Engineering for flow testing
and the results are shown above. The Supra Turbo pump can be purchased for about
$200 (sometimes less) from places like Conicelli Parts Center. In retrospect, I never should have
accepted a part that had the part numbers ground off, and will not in the
future. On a humorous note, this pump actually performs better than the “HKS”
Below are some pictures of the HKS fuel pump that I purchased. I
returned it after seeing it was the Cosmo pump, which flows less than the Supra
pump I already had. I cannot caution people enough to avoid the “HKS” pump (if
it is actually Denso 195130-0771) when it is sold at the exorbitant price of
$400 to $800.
Please note that flow values in the tables below are for 13.5
volts supplied at the pump. Voltage at the pump in your car may be only 10.5 to
12 volts, and so actual flow may be much less than the values indicated below.
Fuel Pumps for the
lph @ 43psi
gph @ 43psi
Comments Mitsubishi VR4 Denso
180 48 This pump also may be used in the Celica GT-4.
use with 360 cc/min injectors up to 12-15 psi boost
when voltage is
less than 12 volts.
Light blue or green tag on top.
210 55 Flow data is from The Old
Good for use with 450 cc/min injectors.
62.2 mm diameter;
Requires modifications to the pump assembly.
Mazda RX-7 Turbo Denso
235 62 Road///Race Engineering says 210 lph @ 12 v.
use with 450 cc/min injectors.
255 67 This flow data is from Auto Performance Engineering.
Good for use with 450
The Walbro 341 can be purchased from Extreme PSI
$100. An adapter is required for the pickup tube and
Nissan 300ZX Turbo
(Skyline the same?)
255 67 This flow data is from RC Engineering tests for
Requires modification to pump assembly pickup tube.
for use with 550 cc/min injectors if supplied
voltage is kept high.
Related Posts About the author