1988 Chevy Blazer K-5 Blazer won't start

LRSULRICH

MEMBER
1988 CHEVROLET BLAZER

1988 Chevy Blazer

I owe an '88 K-5 Blazer. It has a rebuilt 350 TBI in it with only about 30,000 miles. The fuel pump that was on it burned out and I got a new one, but now I'm having some unusual problems. The pump is pumping and sending all the way up through all the lines to the fuel filter and what not, but it is not making it up to the injection. Even if the engine is primed to run, no fuel gets through. I've tried everything and cannot figure out what was wrong. Anyone has any ideas?

5 Replies

JDL

MECHANIC
16,098 POSTS

You need to check fuel pressure with a gage.

If you pour a little gas in the throttle-body, does it try to start? Is there an injector pulse, two wire connector, b+ and ground. Is there spark at the plugs, with the engine cranking? Any codes?

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Friday, January 29th, 2021 AT 2:09 PM

LRSULRICH

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3 POSTS

When the motor is primed, it runs perfectly. And everything with the fuel pump is working, there's pressure and everything. Somehow the fuel just seems to disappear once it goes through the filter. The filter is also clean enough to work, it's been checked.

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Friday, January 29th, 2021 AT 2:09 PM

JDL

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With the TBI system, you should be able to see injector spray pattern, can you see fuel spray? If not check for B+ and ground at the injector plug, you can use a noid lite.

I still need the fuel pressure specs? If you think a fuel line is plugged, make sure there is no pressure on the system, take the line loose loose on both ends, see if you can blow air through it.

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Friday, January 29th, 2021 AT 2:09 PM

LRSULRICH

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Well I seem to have fixed that problem, but now I'm now I'm not getting spray from the injectors. There is voltage there but no ground. The computer was replaced about a month ago so I think it's still good, what else could cause the injectors not to engage?

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Friday, January 29th, 2021 AT 2:09 PM

JDL

MECHANIC
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Other than a faulty computer, I can only think of two things that might cause the injector circuit not to ground. One is a fault on the ground circuit and other is, the computer might not see an rpm signal. Were there any codes?