1990 Chevy Lumina APV No Start

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TUOMIRA
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1990 Chevy Lumina APV minivan. Van will not start after 2 hours of not use. If I pour a little gasoline in its supposed to be a fuleinjector but llooks like a carburator, it will start & runs good. I replaced the regulator diapram but that did not help. Seems like the initial fuel evaporates & it dont want to start until fuel is poured manually into it. Your help would be appreciated.
Jul 8, 2006 at 1:42 PM
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MIKEYBDMAN
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It continues to run once it is started, or it dies after the fuel you poured in evaporates?
Jul 9, 2006 at 7:17 AM
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TUOMIRA
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It continues to run
Jul 9, 2006 at 8:40 AM
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MIKEYBDMAN
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Here are some things to check for your symptoms. It sounds to me like the check vavle in the fuel tank, but here are some things to check.:

-Binding or sticking TPS, or high TPS voltage with throttle closed.
-High resistance in coolant sensor circuit (see Trouble Code 15).
-Incorrect fuel pressure or contaminated fuel.
-Improper EGR operation, leaking, binding or sticking EGR valve.
-Ignition system malfunction, worn damaged or fouled spark plugs.
-Defective in-tank fuel pump check valve allowing fuel to drain back to tank after engine is stopped.
-On V6-173 (2.8L) if engine starts, then dies, open distributor bypass line. If engine starts and runs properly, replace pickup coil.
Jul 9, 2006 at 8:59 AM
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TUOMIRA
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How does the coolant sensor interact with the fuel delivery.I am having aproblem with the cooling fan not coming on?
Jul 9, 2006 at 9:22 AM
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MIKEYBDMAN
  • ✓Experienced Mechanic
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It doesnt affect fuel delivery, however it does affect timing which can make it hard to start.
Jul 9, 2006 at 9:52 AM
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Suggested Repair

Suspect a defective in-tank fuel pump check valve that lets fuel drain back after shutdown. Also check fuel pressure and contamination, closed-throttle TPS voltage, EGR operation, spark plugs and ignition, and coolant-sensor circuit resistance, which can affect timing and starting but not fuel delivery.

Conversation Summary

A 1990 Chevrolet Lumina APV will not start after sitting about two hours, but starts and keeps running if a little gasoline is poured into the throttle body. Replacing the regulator diaphragm did not help. The expert said the in-tank fuel pump check valve is a likely cause of fuel drain-back and listed checks for fuel pressure, TPS, EGR, ignition, and the coolant sensor. The coolant sensor does not control fuel delivery but can affect timing; a cooling-fan complaint was mentioned but not diagnosed.

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