i need some help with a tbi please

[4x4k20]

i have been fooling for a week now on a 92 gmc s10 with the 4.3 it will run fine as long as it does not have any kind of load put on it / as soon as you put it in gear it dies / then to get it started back you have to turn it over and pump the pedal like it has a carb to get it to start back/ i have replaced every sensor and even the tbi unit and it still does the same thing any input would be apperacaited thanks

 

[Jason4x4]

what's the fuel pressure?

 

[Thunder]

Have you checked for trouble codes?

 

[6.2Blazer]

There are lots of easy things you can check before starting to randomly throw parts (and money) at it like it sounds you have.

The first thing I would check is the fuel pressure, my guess is it's low and therefore the pump is going bad.........but again I would check the pressure before throwing a new pump at it.

 

[4x4k20]

i checked the fuel pressure it only goes up to 5psi

 

[Blazin'4x4]

Fuel injection requires alot more pressure, Where did you take your reading from?

 

[4X4HIGH]

There is a problem with that. TBI requires 9-13 PSI to run correctly. Sounds like a bad pump to me. Also check the vacuum hose to your map sensor, if it's plugged or unhooked you get the same symptoms of idles fine but under a load will die.

 

[Thunder]

if you only have 5PSI FP
First change the fuel filter
If that does not help the pump is probabally bad. Time to drop the fuel tank.

 

[87subncamden]

We had a 91 s10 blazer with the same problem. They have that spider injection that can fail at any moment. Turns out we replaced the fuel filter and pump and it ran great.