Re: Fuel pump relay & fuel pump inertia switch
"Bruce L. Bergman" <blPYTHONbergman@earthlink.invalid> wrote in message
> On Wed, 8 Mar 2006 19:50:43 -0600, "Dalton" <firstname.lastname@example.org> wrote:[color=green]
>>"Bruce L. Bergman" <blPYTHONbergman@earthlink.invalid> wrote in message
>>> On Tue, 7 Mar 2006 20:48:33 -0600, "Dalton" <email@example.com> wrote:[/color][/color]
>>>>Anyone could tell me where to find Fuel pump relay and fuel pump inertia
>>>>switch on my 95 T100. The engine kills when I accelerate hard. By the
>>>>way 576000 original miles.
>>> I'd think the first suspects would be a bad fuel pump, clogged or
>>> pinched fuel system line, or bad fuel pressure regulator, something in
>>> that area - when the fuel pump pressure and flow can't keep up with
>>> the injector demand at WOT, it'll act like the fuel pump or the
>>> ignition is cutting off.
>>> Hook up a fuel pressure gauge (with a long hose) to the test point
>>> on the injector rail, take someone with you to watch the pressure
>>> gauge, go out test-driving and romp on the gas hard.
>>> IIRC the fuel rail pressure is supposed to go up when RPM's and fuel
>>> demand are higher - if it stays static or drops, the pressure
>>> regulator has problems.[/color]
>>Where is the regulator located? Is it in the pump itself?
>>Yes the engine light is on. Its been on for a long time. Even before
> I think the fuel pressure regulator is on top of the engine,
> attached to the fuel rail, and it probably has test ports on the input
> and output so you can see if it's the fuel pump or the regulator.
> I've pretty much exhausted my stash of clues (I don't do this every
> day, but I know the theory) - Let's see if Ray or one of the MDT Techs
> that hangs out here can take over.
> --<< Bruce >>--
> Bruce L. Bergman, Woodland Hills (Los Angeles) CA - Desktop
> Electrician for Westend Electric - CA726700
> 5737 Kanan Rd. #359, Agoura CA 91301 (818) 889-9545
> Spamtrapped address: Remove the python and the invalid, and use a net.[/color]
I've seen fuel pressure regulators by the fuel rail and attached to the
tank-mounted fuel pump. I don't know the setup on the T-100. The one by
the fuel rail looks like a diaphragm-looking thing. As for the checking
fuel pressure, I don't think there are test ports. The Toyota SST attaches
with a banjo fitting installed in-line where the fuel line attaches to the
rail - this method of measuring fuel pressure would work as long as you are
downstream from the regulator.
The OP mentioned a check engine light - I'd start by pulling codes. I don't
know if the T-100 has OBD II or not although you can look under the driver's
side of the dash for a port that is shaped kind of like a parallel connector
for a printer to a PC. This shape diagnostic port is OBD II and trouble
codes can be read and cleared with a universal OBD II code reader.
If the diagnostic port is square, then the system is not OBD II. In this
case, jump terminals TE1 and E1 with a paper clip and count the flashes.
There will be a short pause between the first and second digit of the
malfunction code and a longer pause between the first code and subsequent
codes. A steady flash means that no codes are stored. Clear codes by
pulling the EFI main fuse or disconnecting the negative terminal of the
battery for 30 seconds. Keep in mind that disconnecting the battery will
clear radio presets and clock time as well.
(correct punctuation to reply)