[Supras] Fuel pressure.

[Sean Cavanaugh]

I didn't mean that it back flowed immediately. Yes it should take a while. Like he listed, it happened overnight or after hours of being parked. 
I like that 12v mod, prob have to do that to mine also.
 
-Sean




> Date: Thu, 18 Oct 2007 21:20:05 -0500> From: rdp at ix.netcom.com> To: Millenia2000 at hotmail.com> CC: vladiborev at yahoo.com; supras at supras.com> Subject: Re: [Supras] Fuel pressure.> > There should be a check valve in the fuel pump to prevent back flow. > Fuel pressure should drop very slowly after the key is off, but loosing > all pressure overnight is totally normal. Loosing pressure quickly > might indicate a leaking injector or bad fuel pump check valve. If you > shut the motor off and it takes a bit to restart while still hot, that > could be some form of fuel vapor lock.> > Easy test would be to place a jumper (paper clip) between B+ and Fp > within the diag block. This will send a 12v signal to the fuel pump > when you turn the ignition on pre-priming the fuel system. If that > clears up your hard start problem, then you could check the voltage at > the fuel pump (the Supra uses a resistor/relay to step between 9v and > 12v to the fuel pump) or it might be time to replace the fuel pump. If > the car is still hard to start, you might want to look for a weak > ignition. Replacing the plugs and wires.> > Sean - once you do the 12v mod (putting 12v to the fuel pump via heavier > gauge wire and relay when IGN is on), many Supras fire right up when you > turn key. Which actually might not be a bad idea for Vladimir's car > either...> -Rich> > Sean Cavanaugh wrote:> > far as I know, that's normal. after car is off, fuel flows backwards thru > > the pump into the tank. first few seconds of cranking reprimes the line with > > fuel and you're good to go. I have never heard of a MKIII with a stock pump > > that starts right up without a little lag.> >> > -Sean> >> > ----- Original Message -----> > From: "Vladimir Ponomarev" <vladiborev at yahoo.com>> > To: <supras at supras.com>> > Sent: Thursday, October 18, 2007 6:07 PM> > Subject: [Supras] Fuel pressure.> >> > > >> Hi guys. I have noticed a fuel pressure drop after my 91T with 170 kmiles> >> sits overnight in the garage or even after few hours after stop. It takes> >> time to build fuel pressure again and to crank her. Question: what is the> >> most likely cause of the pressure drop? I have switched to AFPR, but it> >> didn't help. What is my next bet?> >> Thanks.> >>> >> Vlad.> >> _______________________________________________> >> Supras mailing list> >> Supras at supras.com> >> http://supras.com/mailman/listinfo/supras_supras.com> >>> >> > >> > _______________________________________________> > Supras mailing list> > Supras at supras.com> > http://supras.com/mailman/listinfo/supras_supras.com> >> >> > > > 
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