Bonkers Posted October 25, 2019 Share Posted October 25, 2019 ... and yes ive tried the fuel ballast, fuel relay, and tps... 88, 4.0L, 5spd, 2wd - occasionally started, but has not been driven in 10+ years. 135k I can hear the pump prime (and i get a spray out of the valve though i don't have a tester) but it sounds horrible. I'm trying to avoid dropping the tank, so I'm curious if anyone has any ideas on what else it could be? Link to comment Share on other sites More sharing options...
COM86 Posted October 25, 2019 Share Posted October 25, 2019 Check vacuum tubing. Link to comment Share on other sites More sharing options...
Ωhm Posted October 25, 2019 Share Posted October 25, 2019 Check MAP hose. Can you keep engine running with a spray can of starting fluid? Link to comment Share on other sites More sharing options...
fiatslug87 Posted October 25, 2019 Share Posted October 25, 2019 If you have to to remove the fuel pump, dropping the tank is not necessary. Link to comment Share on other sites More sharing options...
Bonkers Posted October 26, 2019 Author Share Posted October 26, 2019 The vacuum tubing is mostly new and i don't see any breaks or dangling lines. I can keep the motor running a few seconds longer with starter fluid. If i turn the key off and start it fires right up. If i leave the key in the on position and try to start it again, it will not start. Link to comment Share on other sites More sharing options...
87MJTIM Posted October 26, 2019 Share Posted October 26, 2019 If you give it gas, does it continue running? or does it die whether or not you give it gas? Link to comment Share on other sites More sharing options...
Bonkers Posted October 26, 2019 Author Share Posted October 26, 2019 Doesnt change the stall, but if i press the pedal down while cranking, it will not start. Link to comment Share on other sites More sharing options...
eaglescout526 Posted October 26, 2019 Share Posted October 26, 2019 TPS maybe? Link to comment Share on other sites More sharing options...
Warren Mohler Posted October 26, 2019 Share Posted October 26, 2019 2 hours ago, Bonkers said: The vacuum tubing is mostly new and i don't see any breaks or dangling lines. I can keep the motor running a few seconds longer with starter fluid. If i turn the key off and start it fires right up. If i leave the key in the on position and try to start it again, it will not start. sounds like its priming, I would see if ecu is providing ground to fuel pump relay terminal 85 at relay and power at 86 ign. Link to comment Share on other sites More sharing options...
Bonkers Posted October 27, 2019 Author Share Posted October 27, 2019 The truck in question has 5 relays, theyre all hot when i turn the ignition on... Link to comment Share on other sites More sharing options...
Warren Mohler Posted October 27, 2019 Share Posted October 27, 2019 2 minutes ago, Bonkers said: The truck in question has 5 relays, theyre all hot when i turn the ignition on... fuel pump relay needs to be hot at 30 from fusible link most likely at starter relay and 86 from ign. 85 is grnd. from ecu, so you need b+ at two places, and 87 with relay powered up Link to comment Share on other sites More sharing options...
cruiser54 Posted October 27, 2019 Share Posted October 27, 2019 Good chance the rubber hose inside the tank from the fuel pump to the pickup pipe is trash. Link to comment Share on other sites More sharing options...
Bonkers Posted October 27, 2019 Author Share Posted October 27, 2019 Any of you guys ever see this before? It looks original, feels original, but for the life of me i have no idea where it came from if it didnt come from the factory... Link to comment Share on other sites More sharing options...
Eagle Posted October 27, 2019 Share Posted October 27, 2019 7 hours ago, Bonkers said: Any of you guys ever see this before? It looks original, feels original, but for the life of me i have no idea where it came from if it didnt come from the factory... What are you trying to call out? I see at least two butt splices in that photo that definitely didn't come from the factory. Link to comment Share on other sites More sharing options...
Bonkers Posted October 28, 2019 Author Share Posted October 28, 2019 I'm not sure what you mean by "trying to call out." There are splices and cuts all over this harness, but the relay connections travel directly into the loom, the splicing is (mostly) connected to the starter relay and some kind of jumper harness. It rained today, but ill try to get better pics tomorrow... Link to comment Share on other sites More sharing options...
EUREKA Posted October 31, 2019 Share Posted October 31, 2019 Do you have a fuel pressure gauge? Link to comment Share on other sites More sharing options...
mjeff87 Posted October 31, 2019 Share Posted October 31, 2019 swap the fuel pump relay, see if that solves it. Link to comment Share on other sites More sharing options...
Bonkers Posted November 3, 2019 Author Share Posted November 3, 2019 On 10/31/2019 at 7:53 AM, mjeff87 said: swap the fuel pump relay, see if that solves it. Ive tried randomly swapping relays, but i havent had time to figure out which one is the fuel pump on the 5bank setup. Link to comment Share on other sites More sharing options...
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