fuel problems

[dragon_person48884]

i have a 1991 geo tracker that is not getting power to the injecter and automatic choke and whatever else go with it . it will turn over all day its getting good spark ive checked all the wires i have even changed the computer and nothing the fuel pump works good. if i pour some gas into the throttle body it will start until the little gas i put in runs out i dont know if its a relay or what but i need some help

[Max]

Did you replace the fuel filter? (filters maybe)

[lord_galathon]

According to a friend who had a similar problem, in the driver's side, rear quarter panel (access by removing trim inside the truck) you have the connector for the fuel pump harness.

This connector will corrode and stop working.

It's an easy fix, just replace the connector or somehow reestablish the electric current to the fuel pump.

Good luck!

[dragon_person48884]

i have put a new fuel filter on i also re hooked those wire in that harness it was looking bad but i still dont have any power going through the wire harness that go the the fuel injecter throttle response sensor and whatever else is hooked to it i dont know if there is a relay or sensor that controls of that stuff i have even replaced the computer ive checked all the wires they look good, it gets fuel to the back of the throttle carb body. i have no idea whats going on

[jtgh]

great ( class book) diagnosis !!
the next quesition is , is the fuel pump getting 12dc
to its input. ( get close to pump , here it run !!)
if it not then trace backwords with a simple volt meter.
if is hot (12v) then
1- either your startup fuel pressure is much less than 15psi or your TBI (throttle body) injecter is not getting its
pulse (or is bad ( measures 1 ohm on coil +-)).

you said you replaced the ECU. ( many spares are in fact bad)

You dont have NOID lite ( to go across the injector conn) or scope to check it. If you did and the NOID was dead then youd have good nfo)

my manual (oem) says car will start : ( coil is ok)
1- good static fuel pressure at pump.
2- good TPS (throttle position sensor , ohm it out) ( min to max throttle)
3- Book says MAP can be bad and start ( untried by me)
it says MAP or TPS must be good to start but one or other can be bad.
4- water temperature must show water cold , not 200 degress F , when in fact it is 65 degress !!!
ohm it out. starting a cold engine with a hot engine profile is not easy.

all other sensors are ignored, oxy, Air Temp , egr, etc. (during cold start)
since you have spark your DISTY CAS is good.

( it cranks ,it sparks and runs force fed.) ( the cps ,cas is in the DIStributor) it is like the little drummer boy.
TDC,TDC, repeat.

this should put you on the correct path
good luck

jargon.
cas= crank angle senor
cps = crank position sensor.
some cars have 2 cas's one on crank and 1 on cam, either can start car and run ( albet poorly in the latter case)
you only have 1 cas. and it is good.

[dragon_person48884]

so if i get a new distributer, will that make my fuel injecter and the other electrical stuff that runs through the wires that are hooked in with the fuel injecter .

[dragon_person48884]

i got the beast running, it was the computer i only changed the black box by the clutch i didnt know that the computer was farther under the dash i changed it and started right up it was sweet it just a little mud toy anyways but i would like to thank everyone for you help.