confusedmech93 Posted January 14, 2023 Share Posted January 14, 2023 Doing routine service on unit, filled fuel filters up prior to install. Gave it a few pumps on the manual pump prior to cranking. It ran for about it ran for about 5-7 minutes while i was greasing fittings. started to sputter and died out, fuel filter rand dry. refilled and pumped some more, havent been able to get it to start since. called local mack shop, shop foreman said on these 164s the only thing you can do is keep pumping the manual pump and that the owners manual states at least 100 pumps from the manual pump to get it reprimed.... needless to say, ive pumped it well over 100 times and im still not turning over. Any other suggestions? Quote Link to comment https://www.bigmacktrucks.com/topic/71055-2020-mack-p164t-lost-prime-after-routine-service/ Share on other sites More sharing options...
fjh Posted January 14, 2023 Share Posted January 14, 2023 1 hour ago, confusedmech93 said: Doing routine service on unit, filled fuel filters up prior to install. Gave it a few pumps on the manual pump prior to cranking. It ran for about it ran for about 5-7 minutes while i was greasing fittings. started to sputter and died out, fuel filter rand dry. refilled and pumped some more, havent been able to get it to start since. called local mack shop, shop foreman said on these 164s the only thing you can do is keep pumping the manual pump and that the owners manual states at least 100 pumps from the manual pump to get it reprimed.... needless to say, ive pumped it well over 100 times and im still not turning over. Any other suggestions? Yup its Sad that The big V in All there Wisdom Have not installed a Electric fuel pump! Instead of that medieval dinky chainsaw primer to the dollar store HPCR! Quote Link to comment https://www.bigmacktrucks.com/topic/71055-2020-mack-p164t-lost-prime-after-routine-service/#findComment-521251 Share on other sites More sharing options...
confusedmech93 Posted January 14, 2023 Author Share Posted January 14, 2023 I’m at a loss. I’ve been pumping at this thing for for god knows how long, still nothing. Quote Link to comment https://www.bigmacktrucks.com/topic/71055-2020-mack-p164t-lost-prime-after-routine-service/#findComment-521260 Share on other sites More sharing options...
Mackpro Posted January 15, 2023 Share Posted January 15, 2023 On the Mack common rail engines , they have done away with the fuel pressure relief valve . So any leak or issue makes them hard to start. Does it have the 2 spin on fuel filters or one spin on and the Davco filter? If 2 spin on filters, remove the rear filter and look at the bottom of the filter stand. You will see a orange rubber flapper with a metal spring wire holding it closed. See if any debris or trash is holding it open. A Phillips screwdriver can remove the flapper for a better look . Clean it out . This is where the fuel comes in from the tanks and seems to get trash stuck in there . Quote Link to comment https://www.bigmacktrucks.com/topic/71055-2020-mack-p164t-lost-prime-after-routine-service/#findComment-521337 Share on other sites More sharing options...
Mackpro Posted January 15, 2023 Share Posted January 15, 2023 (edited) Here’s a pic with the flapper removed and the hole clogged with black crud. Top left of picture. This is only on the common rail engines starting around 2017-2018 Edited January 15, 2023 by Mackpro Quote Link to comment https://www.bigmacktrucks.com/topic/71055-2020-mack-p164t-lost-prime-after-routine-service/#findComment-521338 Share on other sites More sharing options...
Mackpro Posted January 15, 2023 Share Posted January 15, 2023 I have also had to loosen the rear filter and remove fuel tank cap abs stick a blow gun in the tank and stuck rags around blowgun and shoot air into the tank till fuel started coming out at filter stand then tighten filter. Make sure your using the correct filter also. The fuel filters for the common rail is different and all the early MP engines. Mack only approves certain aftermarket fuel filters to work Quote Link to comment https://www.bigmacktrucks.com/topic/71055-2020-mack-p164t-lost-prime-after-routine-service/#findComment-521340 Share on other sites More sharing options...
Mackpro Posted January 15, 2023 Share Posted January 15, 2023 Quote Link to comment https://www.bigmacktrucks.com/topic/71055-2020-mack-p164t-lost-prime-after-routine-service/#findComment-521341 Share on other sites More sharing options...
Mackpro Posted January 15, 2023 Share Posted January 15, 2023 The Mack /Volvo filters for the common rail engines Quote Link to comment https://www.bigmacktrucks.com/topic/71055-2020-mack-p164t-lost-prime-after-routine-service/#findComment-521342 Share on other sites More sharing options...
Mackpro Posted January 15, 2023 Share Posted January 15, 2023 Mack issued many bulletins on the fuel filter changes. I can only screenshot them due to the new format. So I can’t really get all of it in the picture. Quote Link to comment https://www.bigmacktrucks.com/topic/71055-2020-mack-p164t-lost-prime-after-routine-service/#findComment-521343 Share on other sites More sharing options...
mdixon Posted January 23, 2023 Share Posted January 23, 2023 We blow in the tanks while cranking the engine. Usually I'll watch the live data on the pump supply pressure until it starts climbing, then ask someone to crank it while blowing air into the tank. Quote Link to comment https://www.bigmacktrucks.com/topic/71055-2020-mack-p164t-lost-prime-after-routine-service/#findComment-523622 Share on other sites More sharing options...
Mackpro Posted January 23, 2023 Share Posted January 23, 2023 The first few years of the common rail the removed the fuel pressure sensor from the filter stand. Only way you could view it was by looking at the AHI fuel pressure sensor ( all in the filter stand now). Finally Mack/Volvo gave in and started putting a fuel pressure sensor back on the filter stand. I also thought if the EPRV had not already been deleted, what would happen is the EPRV was stuck open? Quote Link to comment https://www.bigmacktrucks.com/topic/71055-2020-mack-p164t-lost-prime-after-routine-service/#findComment-523630 Share on other sites More sharing options...
mdixon Posted January 23, 2023 Share Posted January 23, 2023 We've got a 19 and a 20, I believe the 19 doesn't have a low pressure sensor and the 20 does. I'd have to double check though, usually I get these calls and it's 10pm I don't really know which truck I'm looking at. What's EPRV? Quote Link to comment https://www.bigmacktrucks.com/topic/71055-2020-mack-p164t-lost-prime-after-routine-service/#findComment-523642 Share on other sites More sharing options...
Onyx610 Posted January 23, 2023 Share Posted January 23, 2023 Electronic Pressure Relief Valve Quote Link to comment https://www.bigmacktrucks.com/topic/71055-2020-mack-p164t-lost-prime-after-routine-service/#findComment-523647 Share on other sites More sharing options...
Onyx610 Posted January 23, 2023 Share Posted January 23, 2023 https://static.nhtsa.gov/odi/tsbs/2021/MC-10195317-0001.pdf Quote Link to comment https://www.bigmacktrucks.com/topic/71055-2020-mack-p164t-lost-prime-after-routine-service/#findComment-523648 Share on other sites More sharing options...
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