Car keeps stalling need to know if it is fuel pump.

hot or cold engine or both?





which engine, to work on one, you need to know what it is

and what EFI system it uses. or its all just a crap shoot.

no new distributor cap and rotor why skip the full tune up,. why?



first questions.

1: can you save the stall with a a fast right foot.

2: why change out pump etc, if fuel pressure is at spec, a $20 tool would have saved you 5 hours hard labor and bath in fuel? why?





Stalls 101.:



the engine can stall for over 50 reasons are you going to do all 50?

surely not. why not consider diagnosis.. as a path.

1: car stalls, right foot saves it. and can drive fast if i keep foot busy.

a: ISC stuck closed.

b: EGR valve stuck open (depends on which engine options)

c: low compression on one or more cylinders.

2: can\'t save it from stalling (right foot)

a: fuel pressure is low. (wires bad.)

b: lost spark, for any reasons.

c: lost 12vdc to the EFI system( killing spark and fueling)



stalls.

hot or cold or both

stalls, can save it or not, hot and cold

hot restarts are easy and it runs good hot,yes./no.



there is lots more to it, then just stalls. lots more.

The oil pressure light can/will keep power from reaching the fuel pump. So you would need to check oil pressure first.
Then once the oil pressure light problem is resolved checking the fuel pressure might be next.

I've heard of an excel with problems with the signal from the computer not keeping the fuel pump on, if I recall, that was on a '91 excel. To check yours, you would need to monitor the fuel pressure with a fuel pressure gauge, when the car was running, and still hooked up when the car strops running. If the pressure drops when the car stalls, you know you have a problem in the fuel pump circuit. The owner of that '91 excel had replaced the computer once, and believed he needed another. Don't know if this is your problem, but a good place to start is with the fuel pressure test, especially right after the car stalls. If it turns out not to be fuel related, then probably something in your ignition.

Normally fuse blows off if more current passes through it than what it is designed for.

Probably it is worth checking what original fuel pump fuse amps requirements and have the same installed.

Also check the relay if there is a relay set for the fuel pump.

Good luck

When you stop if the Mazda stalls try putting the car into neutral gear and see if it still stalls. if the Mazda does not stall in neutral then the torque converter has failed and needs replacing.

take the gas filter off, and blow through it, if it feels restricted, replace it.

So..... you replaced the pump because it stalls, or it ran ok, and you replaced the pump and now it stalls? Stalls going 50 mph? idle? hot? cold? ck eng light on? codes? Fuel pressure?

did u check the camshaft and crankshaft sensor. most likely crankshaft sensor causes stalling.

Sounds like fuel pump related. Check the pump pressure when the car is warm, also replace the fuel filter.

Try Cleaning All Of Your Oxygen Sensors.
Use Spray Electrical Cleaner Liberally.