94 Chevy 1500 only runs when you pat gas - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**bigunde** · 09-18-2015, 12:29 PM

Just picked up a 94 Chevy Z71 with the 350 TBI engine. I put fresh gas in it, but it will only stay running if you pat the throttle, otherwise it shuts off no matter where the pedal position is. Any ideas???

flashed · 09-18-2015, 12:35 PM

Could the fuel pump be going out ,can you hear the pump come on when you turn on the switch ?

sntrym95 · 09-18-2015, 04:47 PM

I would start with the TPS. Check it to see if it's bad, or the connection is loose or corroded, and replace if necessary.

Here's a thread which sounds similar to what you are experiencing, but no response as to what worked. There are some other suggestions too. http://67-72chevytrucks.com/vboard/s...d.php?t=414355

ChevyTech · 09-19-2015, 09:33 AM

It could be a plugged up fuel filter, and wiggling the gas pedal triggers fuel enrichment.

I would replace the fuel filter, and if it still has problems I would test the fuel pressure.

There are several failures that can cause low fuel pressure.

As these trucks get older it is becoming a common problem for the rubber hose in the tank between the fuel pump and the sending unit to split. It seems like when the TBI trucks sit a long time without being driven the hose inside the fuel tank deteriorates faster.

**bigunde** · 09-19-2015, 12:20 PM

Quote:

Originally Posted by ChevyTech

It could be a plugged up fuel filter, and wiggling the gas pedal triggers fuel enrichment.

I would replace the fuel filter, and if it still has problems I would test the fuel pressure.

There are several failures that can cause low fuel pressure.

As these trucks get older it is becoming a common problem for the rubber hose in the tank between the fuel pump and the sending unit to split. It seems like when the TBI trucks sit a long time without being driven the hose inside the fuel tank deteriorates faster.

Thank you. I put a $40 TPS on it today with no change

Kudzupatch · 09-19-2015, 02:20 PM

Quote:

Originally Posted by bigunde

Thank you. I put a $40 TPS on it today with no change

Not to be a smart aleck, but that is why you test it rather than just throw new parts at it 'hopin' it fixes it. I have been through this and there is lots of info on how to test the sensors.

**bigunde** · 09-23-2015, 10:10 AM

Update. Pump is bad. Thanks all!

09-18-2015, 12:29 PM	#1
bigunde Rusty Rockerfeller Join Date: May 2003 Location: South Georgia Posts: 1,631	94 Chevy 1500 only runs when you pat gas Just picked up a 94 Chevy Z71 with the 350 TBI engine. I put fresh gas in it, but it will only stay running if you pat the throttle, otherwise it shuts off no matter where the pedal position is. Any ideas???

09-18-2015, 12:35 PM	#2
flashed Registered User Join Date: Oct 2009 Location: canton ga Posts: 12,728	Re: 94 Chevy 1500 only runs when you pat gas Could the fuel pump be going out ,can you hear the pump come on when you turn on the switch ?

09-18-2015, 04:47 PM	#3
sntrym95 Registered User Join Date: Jan 2006 Location: Big Pine Key, FL Posts: 745	Re: 94 Chevy 1500 only runs when you pat gas I would start with the TPS. Check it to see if it's bad, or the connection is loose or corroded, and replace if necessary. Here's a thread which sounds similar to what you are experiencing, but no response as to what worked. There are some other suggestions too. http://67-72chevytrucks.com/vboard/s...d.php?t=414355 __________________ Mike

09-19-2015, 09:33 AM	#4
ChevyTech Registered User Join Date: May 2004 Location: Minnesota Posts: 4,620	Re: 94 Chevy 1500 only runs when you pat gas It could be a plugged up fuel filter, and wiggling the gas pedal triggers fuel enrichment. I would replace the fuel filter, and if it still has problems I would test the fuel pressure. There are several failures that can cause low fuel pressure. As these trucks get older it is becoming a common problem for the rubber hose in the tank between the fuel pump and the sending unit to split. It seems like when the TBI trucks sit a long time without being driven the hose inside the fuel tank deteriorates faster. __________________ For those of you that are wondering why you are not getting replies to your thread: Did you give the model, year, engine, fuel system type, and transmission information? If it is modified from what came stock from the factory, let us know that too.

09-23-2015, 10:10 AM	#7
bigunde Rusty Rockerfeller Join Date: May 2003 Location: South Georgia Posts: 1,631	Re: 94 Chevy 1500 only runs when you pat gas Update. Pump is bad. Thanks all! Last edited by bigunde; 09-23-2015 at 02:49 PM.



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