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Isuzu reliability tester
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I am curious about the p-pumped 4bt. I have heard of them but never seen them. Are they worth finding? I would assume there is a performance advantage over a ve pump, is this true? What about mpg compared to a ve pump at, oh say 300 flywheel hp?

What year and kind of vehicle did they come in?
 

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mine is in a 95 oshkosh stepvan.
former fedex ground and RPS truck.
I reckon it gets 15-16 mpgs, pushing a 9 thousand pound cracker box down the road.
stock.
 

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Isuzu reliability tester
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isnt that about the same mpg's the VE pumped engines get in the bread vans? Do all the 95 and newer 4bt's come with a p pump?
 

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The maintenance guy at Frito-Lay where I got my truck said that the P pump motors have more power, but the pumps don't hold up nearly as good as the VE pump. He thinks it's because of ULSD. A diesel specialist told me that the P pump gives better emissions than the VE because of a sharper injection event. I'll stick to my VE for reliability.
 

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that's really surprising, i would expect the other way around. The P pumps are supposed to be more robust because they are lubricated with engine oil, not with fuel like the VE's. i would expect the VE's to be more succeptable to lack of lubrication from ULSD than the P pumps. My personal guess would be that if there is a lack of reliability, it is something other than ULSD.
 

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I am curious about the p-pumped 4bt. What year and kind of vehicle did they come in?
CPL 1839 Inline Pump, 130 HP
1994-98 Oshkosh & Freightliner, “M” Line (MT-35 Freightliner)

This engine has a front sump oil pan. For most conversions, you'll have to rotate the pan 180* and purchase a new oil pump pickup.
 

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p pump

the P Pump has more performance benefits over the rotary(VE) if you are only looking for mpg then there is no real reason to go to a P, dependability they both have been around a long time...Rotay will have limited potential from a total performance...The P pump engines are out there and even more so in the Industrial area. the key is finding a good ADS shop that can build a really good pump, changing some bolt on items will help but not anything like a good ADS shop.........Sorry this is just my thoughts and I'm sure there are alot of guys out there that know more than I do.....
 

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The P pump is the P-7100 correct? I am fairly new to the 4bt's, just trying to learn. If the VE pump is more reliable, that's what I'm after.
The P pump (P7100) is known as the "Million Mile Pump" and it's reliability is unquestionable at this point. The VE is no slouch in the reliability department either. For most applications, I would go with the VE pump. VE pumped 4BT's are cheap and available, compared to P pumped 4BT's. Also, you can turn 'em up for free to satisfy most applications.:)
Bob B.
 
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