pomanferrari

iTrader: (1)

Car wouldn't start, fuel pressure around 21psi and then kept dropping even with GND to F/P on the diagnostic connector.
Checked fuel pump resistor and it shows the right amount of resistance.
Checked the fuel pump connector with ohmeter on A and B which should show continuity. Nothing so according to page F101, it's a dead pump. Only after 20K miles.

Now this is supposedly a rebadged Denso supra pump that rx7.com sells. May be it's not really OEM quality?

I checked my old Denso Cosmos pump and it's showing 10.9 ohms with 40K miles. My stock pump with 68K miles shows 55 ohms.

Question: did your Supra pump failed after only 20K miles?

K-Tune

iTrader: (26)

did your supra pump actually have the Denso logo and denso part number on it?

GoodfellaFD3S

iTrader: (213)

Rotary Performance sells legit parts.

Did you have the pump hotwired to receive constant 12+ volts?

arghx

iTrader: (3)

Strange. I've got a Supra pump right out of a '95 TT. It was in that Supra, then it was in my buddy's Vr-4 for a couple years, and it's been in my car for two years (hotwired).

pomanferrari

iTrader: (1)

Nope. I never went above 320whp so didn't see the need to rewire.

Should I have rewired to bypass the resistor?

moosejaw

iTrader: (6)

I dont know if you bought yours new but.....
Personally I have seen four supra pumps fail while cars were tuned on a dyno

Most people buy them second hand, thinking supra pump=fuel

In reality they have a shelf life of no more than four years.
Never buy a used one, which was the case is all four instances this past dyno tune session in December

I recommend you replace that unit with a Bosch

pomanferrari

iTrader: (1)

Did buy this Denso pump new 4 years ago from RP (rx7.com).

"shelf-life" meaning that if I let it sits outside the fuel tank in my garage?

Bosch 044 isn't a plug and play option so I'm buying another Denso directly from a toyota dealer for the pump so I know for sure that it's OEM quality. see the following site: http://www.stealth316.com/2-fuelpumpguide.htm#j3


A strange thing. I'm looking at the "Cosmos" pump that I bought from SR. It had the Denso part number ground off but under a 10X scope I can see that it's a part number for a Denso Supra pump. So was SR selling the supra pump as cosmos pump?

what the hell kind of business is this?

Bryan Jacobs

iTrader: (66)

yea and they sell $500 painted red stock ppf's LOL

no_more_rice

...one of the most interesting features of this data is the tremendous change in output at lower voltage levels. The change in output from 9 volts to 12 volts at 40, 50, and 60 psi line pressure is 70%, 200%, and 236%, respectively. This would be about 23%, 67%, and 78%, respectively, per volt change in output! Obviously, this fuel pump responds well to small increases in voltage. Output increases are less dramatic at levels above 14 volts, but still significant. This type of variation with supplied voltage may be typical for other high-flow Denso pumps. We won't know until further testing is performed.

Another good reason to re-wire your pump. I replaced the old wiring inside the back hatch and from the pump cover down to the pump and saw a 2 V jump

Fritz Flynn

iTrader: (263)

You're thinking of SR motorsports.

The supra pump is superior to the cosmo pump so it would appear that's a case of under promising and over providing which usually works for me.

The denso pump will last a long time on or off the shelf

That's been my pump of choice for 10 years but I'm also not making over 350 rwhp so I'd say anything over 400 get the apexi GTR pump if you're really going crazy go with two supra tt pumps etc...etc...

The supra TT pump has been a proven pump in these cars for years so I have to disagree with the 4 year life span statement. I'm also NOT a fan of bosch pumps.

no_more_rice

My Supra pump is about 4 years old, so far so good. Plenty of fuel for my little hp output

Wompa164

iTrader: (4)

Wanna buy an Apexi BNR33 fuel pump?

Jason

iTrader: (5)

I have sold hundreds of Supra pumps with very few issues. Possible yours just took a dump early.

PandazRx-7

iTrader: (18)

I wonder if the brand new OEM supra will bump your pressure vs. your old one... let us know, might have to re-tune maybe?

Btw, I have the Apexi BNR33 pump which was a pretty straight forward install. Pump looks identical to the 300ZX/Skyline pump with the rubber jacket in that link, probably same pump that Apexi modified. With stock wiring fuel pressure barely drops at 430rwp. Altough I do plan on doing the Dale Clark re-wire before I re-tune.

adam c

iTrader: (2)

I have been running a Supra pump for more than 6 years. It is one of the most reliable and easiest to install upgrades I have done. One bad apple don't spoil the whole bunch

grimple1

iTrader: (1)

parts fail? *gasp* I had no idea!?? The horror..... the.... horror.....*trails off*

onemeansaturn

As an aside, I had mine fail while being tuned at the RX7Store back in summer 2008. The pump was supposedly a only a year or two old with low mileage (it was installed when I purchased the car and I had the receipts, etc.). Not sure what it made before failing, but I ended up making 405whp after replacing it with a new Supra pump. Like with all things, you should expect that parts won't last forever and you might have just had a bad pump.

pomanferrari

iTrader: (1)

Some pictures.

First is the rx7.com denso pump. Supposedly a Supra turbo pump but as you can see, the model number has been scratched off. So I have no idea what this pump's model is.



For comparison, here is the stock pump. You can see the model number.

Gorilla RE

iTrader: (1)

Rotary performance sells REAL supra denso fuel pumps, no worries. On a supra pump the last four digits in the part number are -1020 instead of the stock rx7s denso pump with -0782. The other visual difference is that the raised top of the supra pump (where the part number is) is always black and the rx7 one is always tan (as seen in the lower pic).

-J

pomanferrari

iTrader: (1)

I took the denso pump out and it seems that my fuel strainer (the sock like portion) that feeds into the pump is clogged.

While waiting for the OEM Toyota Supra turbo pump, I am putting on the SR Motorsport "Cosmos" pump with a new fuel strainer tomorrow. My hunch is that the strainer didn't allow fuel to flow into the pump and probably killing the rx7.com pump.

The thing that bothered me about both rx7.com and SR Motorsports is why they had to scratch off the model number of the pumps? Are these second quality pumps that Denso sells and so Denso (or the vendors) removed the part number?

pomanferrari

iTrader: (1)

Jason - are your pumps Denso 195130-1020 (and without the number scratched off)?

no_more_rice

That was going to be my suggestion, check the filter sock. The pump was starved. These old gas tanks have alot of rust, another reason to use a high quality fuel filter with a 10 micron element to keep that crap out of your injectors. I have Jason's pump in my car and don't recall the numbers being filed off.

t-von

iTrader: (8)

If that's case you may need to change the thread title. It's not the pumps fault if there is clogging elsewhere.

pomanferrari

iTrader: (1)

Here is a picture of the fuel filter strainer in the car.


Here is the new filter part number from Airtex for $20.00.




With the new filter in place. Don't forget the little steel washer retainer.

pomanferrari

iTrader: (1)

How do you do this? Mods can you change the title to: "What happens if you don't change your sock filter on your pump"