Skip the auto shop - Our mechanics make house calls

Q: Van ran yesterday, won't start today. Cranks great. What happens if it's not the pump, but rather the relay, fuse, or other?

asked by on

as stated in question.
My car has an automatic transmission.

Hi There, This may be related to many different possibilities, some of which may be related to a lack of spark or possibly timing issues and some of which may be related to a fuel delivery problem or a combination of both. Things like ignition coils, crankshaft position sensor, spark plugs, spark plug wires or ignition module are all components that help to create spark and control ignition timing which may cause the motor to not produce spark or the correct timing needed to ignite the fuel in the motor.

In the case of a fuel delivery problem, this may be related to low fuel pressure, faulty or dirty fuel injectors, a faulty or dirty idle air control valve (this relays information about air intake to the computer which makes fuel adjustments), or potentially a faulty fuel pressure regulator or fuel pump. Fuel delivery problems will typically not allow the proper amount of fuel to be delivered to the cylinders which results in a lean fuel condition which can cause backfiring or simply cause the motor not to start as a result of fuel starvation. In some cases too much fuel may be supplied to the motor causing too much fuel to be introduced to the motor faster than what it can burn it. This results in the motor being flooded with too much fuel also causing it not to run properly. Any of the above possibilities can create an imbalance in the proper air/fuel ratio as well which will cause the motor to run very rough or not at all. I would recommend having an expert from YourMechanic come to your location to diagnose and inspect your vehicle.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  • Home
  • Questions
  • Van ran yesterday, won't start today. Cranks great. What happens if it's not the pump, but rather the relay, fuse, or other?

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Why is my car running hot?

Hi there, thank you for asking about your 2000 Dodge Grand Caravan. In most cases, the symptoms you're describing are related to a problem with your radiator thermostat. The thermostat is supposed to open the radiator to flow coolant into...

Q: brake booster and master cylinder

Your first step is to verify that the parts you purchased are EXACTLY like the ones you removed. It is possible to have a a similar component fit but have the wrong clearance for the brake pedal pushrod. If they...

Q: Have a 2005 Chevrolet Impala and the fuel guage and temperture guage are not working. What could be problem?

Hi there. If both of these stopped working at the same time then most of the time it is caused by an issue with the instrument panel itself. The logic board that is internal tends to short and cause this....

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...