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Go Back   Dodge Cummins Diesel Forum > 2nd Gen. Dodge Cummins 94-98 12V Forums > 94-98 Powertrain
94-98 Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect...NO ADVERTISING

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Old 12-09-2010, 05:22 PM   #1 (permalink)
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fuel pump spacer

Im doing a p pump conversion on my 98 24v and im putting a mechanical fuel pump from a 97 on. I was wondering if you need the metal spacer between the fuel pump and the engine block? I just mounted the fuel pump straight to the block with a gasket untill i realized that you are supposta have a metal spacer. I can turn the engine over by hand and hear no noise or binding. So i was wondering if its necessary or not? Any advice will be great.
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Old 12-09-2010, 08:38 PM   #2 (permalink)
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Hard to say with a 24 valve cam if the spacer is necessary or if the cam even has a lobe to run the pump.
Personally I would think that if the engine turns over freely that you're fine without the spacer but I would test to see if the pump is actually pumping before going too far.
You might want to ask in the 24 forums if anyone else has done the conversion.

BTW, good move going away with a prone to failure electric pump and using the long lived reliable mechanical pump.

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Old 12-09-2010, 09:37 PM   #3 (permalink)
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I actually used a cam out of a 97. I was told by the dodge dealer that only trucks from northern states and provinces have a spacer and trucks from southern states dont. Any truth to that? Those mechanical fuel pumps are tryed tested and true unlike most of those electric ones.
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Old 12-09-2010, 10:39 PM   #4 (permalink)
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Quote:
Originally Posted by 9824vHammer View Post
I actually used a cam out of a 97. I was told by the dodge dealer that only trucks from northern states and provinces have a spacer and trucks from southern states dont. Any truth to that? Those mechanical fuel pumps are tryed tested and true unlike most of those electric ones.
Chalk up another Dodge dealer that doesn't have a clue. The "spacer" is the mounting bracket for the pre-filter/heater. If I were you I would source the prefilter assy, but trash the heater puck.
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Old 12-09-2010, 10:40 PM   #5 (permalink)
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No, that is straight up incorrect information. All p-pumped 12 valves came with a fuel heater and strainer, the bracket for which was the spacer for the lift pump.


If you can turn the engine over twice (once cam rotation) without interference you should be good. But a spacer would also be easy to make if you wanted to.
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Old 12-09-2010, 11:09 PM   #6 (permalink)
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haha, it seems that not many dealers have any idea about there products. Does anyone know how thick the 'spacer' is? I might machine one but im hoping that ill be ok without it.
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Old 12-09-2010, 11:14 PM   #7 (permalink)
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With the 1st gens you add a piston pump and use a chevy fuel pump spacer from the parts store. I cant attest to this personally though because i got mine as a kit.
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Old 12-10-2010, 01:08 AM   #8 (permalink)
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That would make sense, a BBC block off plate fits perfectly. If nothing else you could use the $3 block off plate as a starting point and cut a hole in it.
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Old 12-10-2010, 10:24 AM   #9 (permalink)
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I have run my 12v without the spacer/heater for a year with no troubles.
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Old 12-10-2010, 10:33 AM   #10 (permalink)
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industrial applications use the exact pump, and use a spacer...

If it doesnt bind, you probably wont hurt anything, but their must be a reason behind the use of a spacer on all of them.
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Old 12-10-2010, 09:41 PM   #11 (permalink)
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I broke down and had a spacer machined. It only cost $10 so i thought i would rather be safe than sorry. Thanks for all the help.
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