GMC Repair: 1994 454 TBI fuel starvation, ford f 350, fuel starvation

Question
I believe I already know my problem but I'll pose the question for more input before I torture myself.  I have a '94 2500 454 TBI Suburban.  It is displaying fuel starvation problems.  It's setting no codes but idles rough, lacks power (starves) at higher rpms, stumbles at low rpms but will run just fine once it's up to speed.  I've observed the injectors and noted that the spray will be fine for a few moments but then sporadically stop, then start spraying fine again (at idle of course).  I've checked the in-line filter but it's not clogged.

I've a sickening suspicion that I'm going to have to drop the tank and I DON'T WANT TO!!!

The ignition module in the distributor was replaced but truck ran fine for several weeks before these problems started.  I've checked all connectors to this and all seems fine.

I don't have a pressure tester yet, however I can check flow which I'll do as soon as the snow stops here.  Is there anything else in your experience that can cause this other than a clogged sock or bad pump?

It's been in my experience that the fuel pumps on these either work, or die.  If it turns out that this is the problem I'll probably add an inline aftermarket (along with an inline pre-filter) that will deliver the proper psi and flow.

Please don't make me drop my tank!!  And what the HECK were the engineers thinking.  How hard would it have been to ad a pump/sender access plate above the tank!!!

Answer
I do believe your fuel pump is the cause. You CAN install an aftermarket but just make ABSOLUTELY SURE that the one you install is manufactured and set up for your EXACT YEAR-MAKE and MODEL of vehicle and make SURE you install it in the EXACT location where the instructions tell you to install it.

I have a 1994 Ford F-350 dually with 2 fuel tanks and one pump died and I preferred to drop BOTH tanks and replace BOTH fuel pumps but everyone has their own preference.



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NOTE: Since the computer is what feeds the electrical supply to the fuel pump you do have the possibility that a problem may exist with the computer and or the oil pressure switch.

make SURE you install a fuel pump tester to monitor pressure as well as a meter to monitor fuel pump voltage to the pump BEFORE you go installing an aftermarket pump.



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