Elwiscon Posted January 28 Share Posted January 28 Hello just replaced my fuel pump, i installed a crappy amazon one that pumped but the level sending unit crapped out, finally got the MTS JPSU-6P4.0 and had time to install today, Amazon pump was working when i took it out, i installed the JPSU-6P4.0 and to my dismay truck cranks but the pump isn’t pumping, as there’s no pressure on the fuel rail. I unplugged it, ran 12V directly to it and i can hear it running, i also checked for voltage at the undercarriage connector, ill disconnect the supply line to see if any gas comes out. As far as i know these pumps are great. What could I have done wrong? There’s about 3 gallons of fuel in the tank so I don’t think it’s out of gas, any ideas? I’ll try to get back on it tomorrow, thanks. Link to comment Share on other sites More sharing options...
eaglescout526 Posted January 28 Share Posted January 28 When you turn the MJ to the on position but not crank, can you hear the fuel pump prime? If yes, then it sounds like the relay has failed. If not, something is wrong in the harness. Link to comment Share on other sites More sharing options...
Elwiscon Posted January 28 Author Share Posted January 28 15 minutes ago, eaglescout526 said: When you turn the MJ to the on position but not crank, can you hear the fuel pump prime? If yes, then it sounds like the relay has failed. If not, something is wrong in the harness. I didn’t hear it prime, but i could be wrong i will look into it next time I’m around, Link to comment Share on other sites More sharing options...
hgeranium Posted January 30 Share Posted January 30 When I was doing my fuel pump and reinstalling the lock ring, it happened twice where the ground wire from the pump to the sending unit came loose. If not anything else, I’d pull it back out and make sure you still have good power and ground connections. Link to comment Share on other sites More sharing options...
Elwiscon Posted January 31 Author Share Posted January 31 8 hours ago, hgeranium said: When I was doing my fuel pump and reinstalling the lock ring, it happened twice where the ground wire from the pump to the sending unit came loose. If not anything else, I’d pull it back out and make sure you still have good power and ground connections. You’re correct, took the pump out yesterday and noticed the spade ground connector came loose, likely while maneuvering the pump to get it in or when tapping (with a brass chisel) the lock ring. I took it out, connected the ground, reinstalled, started the truck and engine turned over right away, and best of all, my fuel gauge is working I’ll just replace the old rubber fuel lines as prevention in the next couple of days. I had an “a-prime” amazon pump that pumped but the level indicator never did, thats why i went my MTS, a lot of fellow MJ owners swear by it. Thanks Link to comment Share on other sites More sharing options...
hgeranium Posted January 31 Share Posted January 31 Just now, Elwiscon said: You’re correct, took the pump out yesterday and noticed the spade ground connector came loose, likely while maneuvering the pump to get it in or when tapping (with a brass chisel) the lock ring. I took it out, connected the ground, reinstalled, started the truck and engine turned over right away, and best of all, my fuel gauge is working I’ll just replace the old rubber fuel lines as prevention in the next couple of days. I had an “a-prime” amazon pump that pumped but the level indicator never did, thats why i went my MTS, a lot of fellow MJ owners swear by it. Thanks Great to hear! Link to comment Share on other sites More sharing options...
Elwiscon Posted January 31 Author Share Posted January 31 Just now, hgeranium said: Great to hear! Thank you, I also slightly squeezed the spade connector with neeedle nose pliers for a tighter fit to make sure it didn’t come loose. Also cleaned and greased (de-ox) the harness connection Link to comment Share on other sites More sharing options...
hgeranium Posted January 31 Share Posted January 31 Bosch makes a fantastic upgraded pump. That pump plus the MTS SU is what's considered to be most reliable/highest quality among stock applications. It's discontinued, so you'd have to grab it off ebay. Just a thought if (God forbid) your pump goes out soon. I have heard mixed things from the MTS house brand fuel pump Link to comment Share on other sites More sharing options...
Elwiscon Posted January 31 Author Share Posted January 31 18 hours ago, hgeranium said: Bosch makes a fantastic upgraded pump. That pump plus the MTS SU is what's considered to be most reliable/highest quality among stock applications. It's discontinued, so you'd have to grab it off ebay. Just a thought if (God forbid) your pump goes out soon. I have heard mixed things from the MTS house brand fuel pump That was my first choice but could not find a bosch pump, just the Amazon generic pump and the MTS, MTS was out of stock for months so ended up with the AMZ one. I may grab another MTS, as prevention, but hopefully this one will last Link to comment Share on other sites More sharing options...
hgeranium Posted February 1 Share Posted February 1 1 hour ago, Elwiscon said: That was my first choice but could not find a bosch pump, just the Amazon generic pump and the MTS, MTS was out of stock for months so ended up with the AMZ one. I may grab another MTS, as prevention, but hopefully this one will last https://www.ebay.com/itm/135101296044?fits=Year%3A1988|Model%3ACherokee|Make%3AJeep&_skw=1988+jeep+cherokee+bosch+fuel+pump&itmmeta=01KGBAHY6CJFPX6FZ16DY07A3A&hash=item1f74aa2dac:g:QvUAAOSwo-Fmac-m&itmprp=enc%3AAQALAAABAO7PUuNWmJ%2B%2BUShgI9tQz%2FpLVb7PSnpOVKXy%2BKww7RdMYoVl5prUlIiv5HF%2B0352dvSyH6oICMQsIqsxFCaVMczzrVqil%2FEVVVwNCbC3iOqpDJMbdDHTgLszyokEo5DPS8XVTYrSQ8zKueqLUHjyNU5F8r%2ByyEC%2Bcr6fnp%2FGgQaizrWt9bn3p8yWlpKroLliE5vydUweXgrGmYWaj6u0aLTJemCIG3ADmxeTDp%2FTD8eTURoQU4Fxb22e2l3pIOUCRDklsZLyHJkR5Ss3Pv6Ho40FduqKIINyFzU%2BPPZhwky%2BF3DG8tuX9h2qf1e%2B6VYoiJ95o2fC2X7kNCHjpoRgcDY%3D|tkp%3ABFBMrOPH6oJn https://www.ebay.com/itm/145861307178?fits=Year%3A1988|Model%3ACherokee|Make%3AJeep&_skw=1988+jeep+cherokee+bosch+fuel+pump&epid=78965678&itmmeta=01KGBAHY6BM8HVBM6VGVSRHBFZ&hash=item21f602eb2a:g:18wAAOSwVQJmgE3A&itmprp=enc%3AAQALAAAA4O7PUuNWmJ%2B%2BUShgI9tQz%2Frn27rIbIX%2Fqcwwj1VCsfdDlIvOGTHuUu8sBxJmXTOXIiG14hf3TcdvbJSFBRTO5z%2Bwv0Eyn2fKdtcuShJlWfCe0aUUOTfE5solLSntk529WbxzxY1SoivV%2FZ40NVQuGMMtH5VSuVF0eKCjmh09OXzQiIdXQHClILBb6Vj5Ki%2Fl2UOvVPtWKw19YrG4JFqgnoVdVxh6bXgosuxjtWfsc4bIuo4mEawgUxvJq4MOx8ity3BNDTNTa4ZpDH3bd9AEUvjZ4dodGI4%2FuvYwJ%2F221S8y|tkp%3ABk9SR6zjx-qCZw https://www.ebay.com/itm/176281211480?fits=Year%3A1988|Model%3ACherokee|Make%3AJeep&_skw=1988+jeep+cherokee+bosch+fuel+pump&itmmeta=01KGBAHY6C8WD3PS9ARMNSRECR&hash=item290b2dd258:g:pDwAAOSwppRl7wEo&itmprp=enc%3AAQALAAABAO7PUuNWmJ%2B%2BUShgI9tQz%2FrJ8E0Pp8nrZZXc5DUc5PwXCCRtycuSe8tDsseIXrqCTEjtXjNq4G6UT0aCXJXg%2FWBDGqD9zCYG2r7IH43lKQjUd4UG1yAMUjNupKMQaEmQiuJR6H9mTGN89ElvX4SJBhVzSAMHSME4GTF5%2BP5CVqfxoc9%2FYbaL%2Fb4WBJkjNKrveBPsApG7f0%2FqYq58gop9gKuGtaFcJku7Qmhs26rbulxcU2cwHUcOejWwSsM03r%2FtvUkR%2F63EzB8ZlAVLakpaB0%2FixhoTkFdWWeOQfxhxd0Htf6mvDRbrf4D7Zetr5oZichkFrnnF6XdeNLE7M08VABA%3D|tkp%3ABFBMrOPH6oJn Here's some. The more expensive one comes with the adapters you need. That's the one I ended up getting. They're brand new Link to comment Share on other sites More sharing options...
Elwiscon Posted February 1 Author Share Posted February 1 15 hours ago, hgeranium said: https://www.ebay.com/itm/135101296044?fits=Year%3A1988|Model%3ACherokee|Make%3AJeep&_skw=1988+jeep+cherokee+bosch+fuel+pump&itmmeta=01KGBAHY6CJFPX6FZ16DY07A3A&hash=item1f74aa2dac:g:QvUAAOSwo-Fmac-m&itmprp=enc%3AAQALAAABAO7PUuNWmJ%2B%2BUShgI9tQz%2FpLVb7PSnpOVKXy%2BKww7RdMYoVl5prUlIiv5HF%2B0352dvSyH6oICMQsIqsxFCaVMczzrVqil%2FEVVVwNCbC3iOqpDJMbdDHTgLszyokEo5DPS8XVTYrSQ8zKueqLUHjyNU5F8r%2ByyEC%2Bcr6fnp%2FGgQaizrWt9bn3p8yWlpKroLliE5vydUweXgrGmYWaj6u0aLTJemCIG3ADmxeTDp%2FTD8eTURoQU4Fxb22e2l3pIOUCRDklsZLyHJkR5Ss3Pv6Ho40FduqKIINyFzU%2BPPZhwky%2BF3DG8tuX9h2qf1e%2B6VYoiJ95o2fC2X7kNCHjpoRgcDY%3D|tkp%3ABFBMrOPH6oJn https://www.ebay.com/itm/145861307178?fits=Year%3A1988|Model%3ACherokee|Make%3AJeep&_skw=1988+jeep+cherokee+bosch+fuel+pump&epid=78965678&itmmeta=01KGBAHY6BM8HVBM6VGVSRHBFZ&hash=item21f602eb2a:g:18wAAOSwVQJmgE3A&itmprp=enc%3AAQALAAAA4O7PUuNWmJ%2B%2BUShgI9tQz%2Frn27rIbIX%2Fqcwwj1VCsfdDlIvOGTHuUu8sBxJmXTOXIiG14hf3TcdvbJSFBRTO5z%2Bwv0Eyn2fKdtcuShJlWfCe0aUUOTfE5solLSntk529WbxzxY1SoivV%2FZ40NVQuGMMtH5VSuVF0eKCjmh09OXzQiIdXQHClILBb6Vj5Ki%2Fl2UOvVPtWKw19YrG4JFqgnoVdVxh6bXgosuxjtWfsc4bIuo4mEawgUxvJq4MOx8ity3BNDTNTa4ZpDH3bd9AEUvjZ4dodGI4%2FuvYwJ%2F221S8y|tkp%3ABk9SR6zjx-qCZw https://www.ebay.com/itm/176281211480?fits=Year%3A1988|Model%3ACherokee|Make%3AJeep&_skw=1988+jeep+cherokee+bosch+fuel+pump&itmmeta=01KGBAHY6C8WD3PS9ARMNSRECR&hash=item290b2dd258:g:pDwAAOSwppRl7wEo&itmprp=enc%3AAQALAAABAO7PUuNWmJ%2B%2BUShgI9tQz%2FrJ8E0Pp8nrZZXc5DUc5PwXCCRtycuSe8tDsseIXrqCTEjtXjNq4G6UT0aCXJXg%2FWBDGqD9zCYG2r7IH43lKQjUd4UG1yAMUjNupKMQaEmQiuJR6H9mTGN89ElvX4SJBhVzSAMHSME4GTF5%2BP5CVqfxoc9%2FYbaL%2Fb4WBJkjNKrveBPsApG7f0%2FqYq58gop9gKuGtaFcJku7Qmhs26rbulxcU2cwHUcOejWwSsM03r%2FtvUkR%2F63EzB8ZlAVLakpaB0%2FixhoTkFdWWeOQfxhxd0Htf6mvDRbrf4D7Zetr5oZichkFrnnF6XdeNLE7M08VABA%3D|tkp%3ABFBMrOPH6oJn Here's some. The more expensive one comes with the adapters you need. That's the one I ended up getting. They're brand new Thank you! Link to comment Share on other sites More sharing options...
hgeranium Posted February 1 Share Posted February 1 3 hours ago, Elwiscon said: Thank you! No problem. I wish that pump best of luck. I'd like to think all the MTS pumps going out are from people running their fuel tanks with too little gas too often lol. Previous owner didn't even install a strainer on the fuel pump that he re-installed, so no wonder it went out so quick. Link to comment Share on other sites More sharing options...
Elwiscon Posted February 1 Author Share Posted February 1 44 minutes ago, hgeranium said: No problem. I wish that pump best of luck. I'd like to think all the MTS pumps going out are from people running their fuel tanks with too little gas too often lol. Previous owner didn't even install a strainer on the fuel pump that he re-installed, so no wonder it went out so quick. I usually fill up when the tank is about 1/4 full, as a rule of thumb regardless of vehicle, the strainer on these fuel pumps is a little loose, i put a zip tie around it, hopefully the zip tie plastic won’t be dissolved by the gas Link to comment Share on other sites More sharing options...
hgeranium Posted February 1 Share Posted February 1 1 hour ago, Elwiscon said: I usually fill up when the tank is about 1/4 full, as a rule of thumb regardless of vehicle, the strainer on these fuel pumps is a little loose, i put a zip tie around it, hopefully the zip tie plastic won’t be dissolved by the gas PO didn't have the correct adapters for the aftermarket pump so he tied a big fat zip tie around the pump and strainer. It was at least a few years old being almost always submerged and it still looked brand new when I pulled the pump out, so you should be OK. Link to comment Share on other sites More sharing options...
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