shortboy2

i have a 88 4 runner runs decent some times it will not start but cranks and has fire and fuel psi but will not runwhen it does start it acts like it flooded and when it clears out it runs good . some times when i shut it offit wil not restart check al the sensors and replaced the normal plugs wires cap rotor fuel filter air flow sensor any help would be welcomed

4Crawler

iTrader: (3)

How have you determined it has fuel pressure?
- http://www.4crawler.com/4x4/CheapTri...shtml#FuelPump

Also, check the vacuum line to the fuel pressure regulator.

shortboy2

when i crack the fuel line at the cold start inj it has fuel psi there and shoot gas all over the top of the engine

4Crawler

iTrader: (3)

Is that while cranking the engine over or before you try to start the engine?

shortboy2

ok i have now found out the only way to get it to start and run is to jump the fuel pump to battery the battey terminal in the dia connector has weak battery power so i jumped it straight to the battery

shortboy2

ok does any one know were the diagiostic conn. gets its battery power from

4Crawler

iTrader: (3)

If you look at the wiring diagram on the page I posted a link to earlier, you'll see there is no power at the diagnostic/fuel pump test connector. Why? Because it is a connection to ground:



It simply provides a path to ground for the current flowing through the secondary winding of the circuit opening relay.

shortboy2

yes i understand that i must be missing something if i just the fp terminal in the diag conn to the b+ term the pump will not run because the b+ terminal is very weak so i jumped it straight to the battery and it ranso i was thinking if the b+ terminal at the diag . connector is weak i have a power problem else were becauce when i ran it to the battery to the fp terminal the truck ran

4Crawler

iTrader: (3)

OK, sounds like you have the newer style test connector, not quite sure which year they changed. In that case, then yes, the B+ is supplying power to the pump. A Factory Service Manual wiring diagram would show you where that terminal is getting power from.