Skip the auto shop - Our mechanics make house calls

Q: Car will crank but no start... Fuel pump not coming on. New pump, relay, etc. Will start when hot wire runs from pump wires to bat

asked by on

We have replaced the fuel pump and relays. Car will crank with hot wire from fuel pump wire harness to battery. ( Wires not getting connection) Tested with test light. When running, car will sometimes stall at red lights or stop signs. Replaced fusebox and car ran for two weeks no problems. but all of a sudden car wouldnt start again, only by hot wire.

My car has 174546 miles.
My car has an automatic transmission.

A: There are a couple of approaches to take he...

There are a couple of approaches to take here - either start from the battery and work "towards" the fuel pump, fuse box, ignition switch, fuel pump relay, and wiring connections in between. Or, as you have done, start at the pump with 12v, and move backwards towards the battery. This will require a GM service manual, or wiring diagram at least, with connection locations as well.

I would recommend having a certified technician from YourMechanic diagnose this starting issue, get an accurate assessment of damage and cost estimate for repairs. YourMechanic.com can dispatch a mobile, professional mechanic to your location for this repair.

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: What is the maximum load weight?

Knowing your the maximum load weight of your vehicle is important to ensure you don’t overload your care and put you and your vehicle at risk. There are two places on your vehicle with labels that show your car’s maximum...

Q: why is my airbag sensor light on ? It has been on for 2 years , I have not gone and got it looked at. Is it serious or dangerous ?

Hi there. If your Air Bag Light comes on, we strongly suggest that you do not ignore it. In general; if the passenger sensing system detects that there’s no one sitting in the passenger front seat or if several other...

Q: Bad Ignition/electrical issue - takes several cranks before it starts!

Hello there, you have a few different faults going on with your 2007 Chevrolet Impala. A vehicle should not have to crank long before it starts unless there is a fault. Given the codes you have listed there are a...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...