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Author Topic: 87 350 TBI starts but won't stay running.  (Read 8194 times)

Offline Quitefranklie

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87 350 TBI starts but won't stay running.
« on: March 22, 2015, 04:04:41 pm »
I have an 87 r10 350 5.7 with TBI. Two weeks ago I ran out of gas then filled up and again and everything was fine then while I was driving it started to sputter and die. I was able to get it running again. Then the same problem happened. I figured I must have pulled something up from the bottom of the tank into the filter. Replaced that. Still no dice. It'll start and stay running as long as I pour gas into it. Fuel pump is working. Not sure if it's putting out enough pressure though. Any ideas?
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Offline Irish_Alley

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Re: 87 350 TBI starts but won't stay running.
« Reply #1 on: March 22, 2015, 05:31:05 pm »
are your injectors firing?
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Offline Quitefranklie

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Re: 87 350 TBI starts but won't stay running.
« Reply #2 on: March 22, 2015, 05:55:41 pm »
Quote from: Irish_Alley on March 22, 2015, 05:31:05 pm
are your injectors firing?

Yes they are.
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Offline Irish_Alley

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Re: 87 350 TBI starts but won't stay running.
« Reply #3 on: March 22, 2015, 07:08:45 pm »
Is it cone shaped or dribble
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Offline Quitefranklie

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Re: 87 350 TBI starts but won't stay running.
« Reply #4 on: March 22, 2015, 09:38:05 pm »
It's dribble.
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Offline LTZ C20

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Re: 87 350 TBI starts but won't stay running.
« Reply #5 on: March 22, 2015, 11:45:28 pm »
The injectors should be spraying in a cone shaped pattern.
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Offline Quitefranklie

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Re: 87 350 TBI starts but won't stay running.
« Reply #6 on: March 22, 2015, 11:48:05 pm »
Okay. So can I replace just the injectors? Or do I need a whole new tbi?
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Offline LTZ C20

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Re: 87 350 TBI starts but won't stay running.
« Reply #7 on: March 22, 2015, 11:59:54 pm »
First you need to determine if you have proper fuel pressure, that your regulator is working properly.
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Offline Quitefranklie

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Re: 87 350 TBI starts but won't stay running.
« Reply #8 on: March 23, 2015, 12:04:29 am »
.
Quote from: LTZ C20 on March 22, 2015, 11:59:54 pm
First you need to determine if you have proper fuel pressure, that your regulator is working properly.

I'm going to test the pressure in the morning. How do I got about testing the regulator? Sorry I'm very new to this.
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Offline LTZ C20

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Re: 87 350 TBI starts but won't stay running.
« Reply #9 on: March 23, 2015, 12:09:30 am »
Check in the manual for your year in the tech section on the regulator check. I'm not sure on that 1. Pressure should be 8-12 or 13. That should be in the manual also.
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Offline Irish_Alley

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Re: 87 350 TBI starts but won't stay running.
« Reply #10 on: March 23, 2015, 09:34:28 am »
Need to put a fuel pressure gauge on the supply line there's no spot made for one so you have to do it yourself. If you're getting proper pressure should be around 18
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If you can’t tell yourself the truth, who can you tell it to?~Irish_Alley

When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes

Offline LTZ C20

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Re: 87 350 TBI starts but won't stay running.
« Reply #11 on: March 23, 2015, 09:36:48 am »
Ok my bad. Pressures at 18 or so, not 8-13.
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Offline Irish_Alley

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Re: 87 350 TBI starts but won't stay running.
« Reply #12 on: March 23, 2015, 09:43:27 am »
a dribble is a sign of low fuel pressure. this can be caused by a weak pump, dirty fuel strainer (fuel sock) crap in the tbi or a dirty fuel filter. there also is a rubber fuel line in the tank that can crack and cause it to loose fuel pressure. but since it happened after you ran out of fuel i would think something is dirty but that could be just a coincidence.

are both injectors doing the dribble thing or just one?
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If you can’t tell yourself the truth, who can you tell it to?~Irish_Alley

When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes
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