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8.4 power to fuel pump will crank but won't start, Hold on

8.4 power to fuel pump...
8.4 power to fuel pump will crank but won't start
JA: Have you checked the fuel supply? And are all the spark plugs working?
Customer: Hold on let me ask husband
JA: What is the model/year of your Chevy?
Customer: 1994 3500 7.4
JA: Are you fixing your 3500 yourself? What have you tried so far?
Customer: Bought new computer ,changed ignition coil,new fuel pump, new relay
JA: Anything else you want the mechanic to know before I connect you?
Customer: No
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Answered in 5 minutes by:
9/10/2017
AMEDEE
AMEDEE, CHEVY TECHNICIAN
Category: Chevy
Satisfied Customers: 26,816
Experience: ASE certified tech ADVANCED LEVEL SPECIALIST. Wisconsin certified emissions state inspector
Verified

Hello and welcome!

My name isCustomerand I can assist you with your question.

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I am very sorry your having this issue with your vehicle.

I will try my best to answer all of your questions.

However, before we get started, please let me mention a few things.

1. If at any point you would like to speak on the phone, please feel free to request a phone call on your end and I can call you right away.

2. If you dont understand any technical terms or anything that I mention (component tests or theory or operation), please let me know and I will provide you with a more in debt explanation or answer.

3. Please understand that I am here to help.

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Does the engine have spark while cranking?

Does it run on starting fluid?

Would you be willing to speak on the phone?

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Customer reply replied 2 months ago
Please call me

You can request a phone call on your end.

I will call you right away when I see it come through..

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Customer reply replied 2 months ago
Im not getting fuel to my injectors

You can request a phone call on your end.

I will call you right away when I see it come through..

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Customer reply replied 2 months ago
Let me check if it will start with fluid

Ok

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Customer reply replied 2 months ago
I would like to talk by phone but text will do for now

Ok, no problem.

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Customer reply replied 2 months ago
Won't start with starter fluid

Ok, then check to see if it has spark.

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Customer reply replied 2 months ago
Spark plugs have spark

Ok, then the ignition or valve timing is incorrect.

Start by checking engine compression and valve timing first.

Then go back and double check the ignition timing.

It could be a faulty cap/rotor causing incorrect timing.

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Customer reply replied 2 months ago
it has spark

Ok, then the ignition or valve timing is incorrect.

Start by checking engine compression and valve timing first.

Then go back and double check the ignition timing.

It could be a faulty cap/rotor causing incorrect timing.

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Customer reply replied 2 months ago
But fuel pump not kicking on

Right. So it could be two separate issues.

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Customer reply replied 2 months ago
Why am I only getting 8.4 to fuel pump?

Most likely a faulty connection or bad connection at or inside a relay

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Customer reply replied 2 months ago
I changed relay changed fuses, Put new ignition coil, new oil pump sensor, new computer

Ok, then a faulty/loose connection would be the next most likely possible cause.

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Customer reply replied 2 months ago
Where should I look?

You will need to check the entire fuel pump circuit to see where you are losing voltage.

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This would be so much easier over the phone.

I can lower the cost of the phone call down to $5 bucks for you.

Is that OK?

AMEDEE
AMEDEE, CHEVY TECHNICIAN
Category: Chevy
Satisfied Customers: 26,816
Experience: ASE certified tech ADVANCED LEVEL SPECIALIST. Wisconsin certified emissions state inspector
Verified
AMEDEE and 87 other Chevy Specialists are ready to help you
Ask your own question now
Customer reply replied 2 months ago
Just checked spark plug wiring won't start
Customer reply replied 2 months ago
Ok

Please call me now

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Customer reply replied 2 months ago
Can I have the number again

I just posted in on the page.

Or, please post your number in the private space so only I can read it.

Ask Your Own Chevy Question

.

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Ask AMEDEE Your Own Question
AMEDEE
AMEDEE
AMEDEE, CHEVY TECHNICIAN
Category: Chevy
Satisfied Customers: 26,816
26,816 Satisfied Customers
Experience: ASE certified tech ADVANCED LEVEL SPECIALIST. Wisconsin certified emissions state inspector

AMEDEE is online now

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