War_Pony89 Posted April 8, 2021 Author Share Posted April 8, 2021 On 3/31/2021 at 8:44 AM, cruiser54 said: Have you completed Tips 1,3,4, and 5 on my website? Hi Cruiser, I completed the ground and ballast connector cleaning, only thing I haven't done is the coil contact cleaning. Fuel pressure seems really low. Auto parts guy said should be around 70 PSI. I have avg 23 psi. Pressure falls immediately after turning off engine. Thoughts? Link to comment Share on other sites More sharing options...
JustEmptyEveryPocket Posted April 8, 2021 Share Posted April 8, 2021 36 minutes ago, War_Pony89 said: JEEP, i finally secured a fuel pressure gauge. on ignition it barely moved one or two marks. Upon starting stayed between 21 and 24 under throttle. Upon cutting the ignition, pressure feel immediately So from what I gathered, that is not good. . Regulator seems fine no leaks or gas smell in the vacuum tube. From what I describe does it sound like fuel pump and not vacuum or ground related? I have been assuming we are talking about a 4.0L engine here. If thats the case, then your fuel pump is almost dead. You can try to refresh the ground for it behind the driver's taillight. Otherwise, looking into replacing the pump. Those fuel numbers are no good at all. Link to comment Share on other sites More sharing options...
JustEmptyEveryPocket Posted April 8, 2021 Share Posted April 8, 2021 35 minutes ago, War_Pony89 said: Auto parts guy said should be around 70 PSI. NEVER EVER trust the parts store monkeys. NEVER! Your fuel pressure should be 31 with vacuum at the regulator and 39 without while running. Before running you should have close to those numbers when the pump primes. Also it should retain pressure for at least some time after you shut the truck off. Link to comment Share on other sites More sharing options...
War_Pony89 Posted April 8, 2021 Author Share Posted April 8, 2021 23 minutes ago, JustEmptyEveryPocket said: I have been assuming we are talking about a 4.0L engine here. If thats the case, then your fuel pump is almost dead. You can try to refresh the ground for it behind the driver's taillight. Otherwise, looking into replacing the pump. Those fuel numbers are no good at all. Yes,4.0. for giggles I'll look at the ground. The tank is full guess I'll have to siphon gas out before removing the pump? Link to comment Share on other sites More sharing options...
JustEmptyEveryPocket Posted April 8, 2021 Share Posted April 8, 2021 4 minutes ago, War_Pony89 said: siphon THIS is the best tool for the job. No more sucking gasoline directly into the lungs. Link to comment Share on other sites More sharing options...
scaleless Posted April 8, 2021 Share Posted April 8, 2021 41 minutes ago, JustEmptyEveryPocket said: No more sucking gasoline directly into the lungs. But that's the best part! Link to comment Share on other sites More sharing options...
cruiser54 Posted April 8, 2021 Share Posted April 8, 2021 Fuel pump and/or the hose from the fuel pump in the tank. Link to comment Share on other sites More sharing options...
Minuit Posted April 8, 2021 Share Posted April 8, 2021 20 minutes ago, cruiser54 said: or the hose from the fuel pump in the tank. and if it's this, it has to be replaced with submersible fuel hose. Link to comment Share on other sites More sharing options...
War_Pony89 Posted April 10, 2021 Author Share Posted April 10, 2021 On 4/8/2021 at 3:26 PM, War_Pony89 said: Yes,4.0. for giggles I'll look at the ground. The tank is full guess I'll have to siphon gas out before removing the pump? So the ground is stripped now. the paint guy did a number sealing it in. I guess I can test for resistance at this point? Reading older posts, sounds like Carter is the better fuel pump to buy? I'm going to check the pump relay, clean the connections and check for resistance also. Link to comment Share on other sites More sharing options...
Minuit Posted April 10, 2021 Share Posted April 10, 2021 Bosch pump. You'll need to do some trimming to the plastic pieces that are included with it. Don't just look at the ground and test it. If you're going to go to the effort, you might as well clean the ground put it back together. 19 minutes ago, War_Pony89 said: So the ground is stripped now. the paint guy did a number sealing it in. I guess I can test for resistance at this point? Reading older posts, sounds like Carter is the better fuel pump to buy? I'm going to check the pump relay, clean the connections and check for resistance also. Link to comment Share on other sites More sharing options...
cruiser54 Posted April 10, 2021 Share Posted April 10, 2021 Bosch. Link to comment Share on other sites More sharing options...
War_Pony89 Posted April 16, 2021 Author Share Posted April 16, 2021 Thanks y'all for the 411! Put the new Bosch unit in, PSI before was 21 and dropped immediately after cutting ignition. With new Bosch unit 31 and stays for days. Truck fires right up and can make it up my hill now in 2nd stead of first. Cut 'n splice two wires is all the mods it took. lots of nice little clamps hoses and parts left over I'm sure will come in handy. Link to comment Share on other sites More sharing options...
cruiser54 Posted April 16, 2021 Share Posted April 16, 2021 Great!! Link to comment Share on other sites More sharing options...
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