mechohaulic Posted August 16, 2025 Share Posted August 16, 2025 Is the hand primer for the 400 still available; this one is worn/sloppy. don't recall ever rebuilding the old style on 673's. haven't contacted Mack yet since the answer will be :: need vin numbers etc. Quote Link to comment https://www.bigmacktrucks.com/topic/75860-e-9-400-rw-mack-prime-loss/ Share on other sites More sharing options...
terry Posted August 16, 2025 Share Posted August 16, 2025 Isn’t it just a o-ring on the plunger and two plastic check valves ? Terry 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75860-e-9-400-rw-mack-prime-loss/#findComment-580832 Share on other sites More sharing options...
mechohaulic Posted August 17, 2025 Author Share Posted August 17, 2025 8 hours ago, terry said: Isn’t it just a o-ring on the plunger and two plastic check valves ? Terry haven't taken it apart yet, it's real worn. not even check valves looked at yet . to get fuel to system the primer spilled more fuel then pumped. Quote Link to comment https://www.bigmacktrucks.com/topic/75860-e-9-400-rw-mack-prime-loss/#findComment-580860 Share on other sites More sharing options...
mechohaulic Posted August 17, 2025 Author Share Posted August 17, 2025 reason I was asking if it's a part still available. thanks for reply. the owner (good person ) can investigate ;I'm a no charge just helping him out. mentally it's my therapy also. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75860-e-9-400-rw-mack-prime-loss/#findComment-580861 Share on other sites More sharing options...
h67st Posted August 18, 2025 Share Posted August 18, 2025 Here's one for the E6, is that what you're working on? https://dieselpartscenter.com/products/primer-pump-genuine-pai-3586?variant=45154128167070&country=US¤cy=USD&utm_medium=product_sync&utm_source=google&utm_content=sag_organic&utm_campaign=sag_organic&gad_source=1&gad_campaignid=21837293241&gclid=EAIaIQobChMIgvHK58CUjwMVWk1HAR02ZRV0EAQYAyABEgIpKPD_BwE Quote Link to comment https://www.bigmacktrucks.com/topic/75860-e-9-400-rw-mack-prime-loss/#findComment-580929 Share on other sites More sharing options...
The Heinz Posted August 19, 2025 Share Posted August 19, 2025 This is PAI's listing for E6/7 fuel supply pumps and primers, are either one of these like the one you need? I have to match these up all the time for my older truck owners, but I've never searched for an E9 (sadly). 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75860-e-9-400-rw-mack-prime-loss/#findComment-581011 Share on other sites More sharing options...
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