TurboedMJ Posted April 18 Author Share Posted April 18 Did a fuel pressure test, fuel pressure with vacuum line hooked up is about 33 lb. And with vacuum line unhooked is about 42 lb. I did notice that immediately after priming the pump or shutting the truck off the fuel pressure started dropping. Link to comment Share on other sites More sharing options...
ghetdjc320 Posted April 18 Share Posted April 18 It’s normal to have it drop pressure in rotary vane pumps. It shouldn’t be a super fast bleed and should always hold some residual pressure. You can add a check valve inline to help keep your system primed. Link to comment Share on other sites More sharing options...
eaglescout526 Posted April 18 Share Posted April 18 Have you inspected the rubber hose the fuel pump is attached to in the tank? Link to comment Share on other sites More sharing options...
cruiser54 Posted April 18 Share Posted April 18 Link to comment Share on other sites More sharing options...
TurboedMJ Posted April 18 Author Share Posted April 18 No but it does have a relatively new fuel pump Link to comment Share on other sites More sharing options...
eaglescout526 Posted April 18 Share Posted April 18 Doesn’t mean that hose is hole free. Link to comment Share on other sites More sharing options...
cruiser54 Posted April 18 Share Posted April 18 Or loose... Link to comment Share on other sites More sharing options...
TurboedMJ Posted April 18 Author Share Posted April 18 Ok, I will check that next. Can I check it without pulling the tank? Link to comment Share on other sites More sharing options...
cruiser54 Posted April 18 Share Posted April 18 Yes Link to comment Share on other sites More sharing options...
TurboedMJ Posted April 24 Author Share Posted April 24 On 4/18/2024 at 1:01 PM, cruiser54 said: Is this hose on the supply side of the fuel pump? Or return? Link to comment Share on other sites More sharing options...
cruiser54 Posted April 24 Share Posted April 24 Supply. Fuel pump outlet inside the tank to sending unit mounting flange. Link to comment Share on other sites More sharing options...
TurboedMJ Posted April 24 Author Share Posted April 24 Ok. Off hand, do you know how empty the tank has to be so that gas doesn't leak everywhere when I pull the pump? Link to comment Share on other sites More sharing options...
eaglescout526 Posted April 24 Share Posted April 24 Bit below half. But between half and 1/4 would be best. Link to comment Share on other sites More sharing options...
TurboedMJ Posted April 24 Author Share Posted April 24 Oh ok perfect. Will update later with results Link to comment Share on other sites More sharing options...
TurboedMJ Posted April 24 Author Share Posted April 24 The hose is brand new. Anything else I should check I have the pump out? Link to comment Share on other sites More sharing options...
eaglescout526 Posted April 24 Share Posted April 24 Clamps good and tight? Link to comment Share on other sites More sharing options...
TurboedMJ Posted April 24 Author Share Posted April 24 48 minutes ago, eaglescout526 said: Clamps good and tight? Yeah they are. Although when I first pulled the pump, I noticed there was some fuel residue on each end of the hose. Link to comment Share on other sites More sharing options...
eaglescout526 Posted April 24 Share Posted April 24 Hmmm. Maybe inspect the ends where the clamps are. Link to comment Share on other sites More sharing options...
Ωhm Posted April 24 Share Posted April 24 Could be just the photo, but hose looks too long, needs trimming. Could be pinched or kinked. Aeration. Link to comment Share on other sites More sharing options...
TurboedMJ Posted April 24 Author Share Posted April 24 I will put a shorter hose on. Link to comment Share on other sites More sharing options...
TurboedMJ Posted April 25 Author Share Posted April 25 I trimmed that hose and put it all back together and the issue is not fixed. Any other suggestions? Link to comment Share on other sites More sharing options...
Ωhm Posted April 25 Share Posted April 25 Just as a quick check look for fuel at the vacuum hose between the Fuel Pressure Regulator (FPR) and intake manifold. Leaky FPR. @brucecooner Link to comment Share on other sites More sharing options...
TurboedMJ Posted April 25 Author Share Posted April 25 It's dry. Link to comment Share on other sites More sharing options...
ghetdjc320 Posted April 25 Share Posted April 25 Did this all start when you swapped injectors or were you experiencing these issues before the swap? Cam and/or crank sensors come to mind. Instead of grouping all issues together and trying to find a single source, try isolating one of them and tracking it down. For instance, with a bad idle, you could try disconnecting injectors one at a time and see if you notice a difference. Link to comment Share on other sites More sharing options...
TurboedMJ Posted April 26 Author Share Posted April 26 44 minutes ago, ghetdjc320 said: Did this all start when you swapped injectors or were you experiencing these issues before the swap? Cam and/or crank sensors come to mind. Instead of grouping all issues together and trying to find a single source, try isolating one of them and tracking it down. For instance, with a bad idle, you could try disconnecting injectors one at a time and see if you notice a difference. As far as I can remember it's been doing since I got the new fuel pump. The new injectors did make it run better, but that's because the ones they replaced were $50 ebay specials. Link to comment Share on other sites More sharing options...
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