Hey guys, who rebuilds mechanical fuel injection pumps?

Started by connor_m_chatswood, 18-06-2026 02:18 PM. 31 replies. 847 views.

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18-06-2026, 02:18 PM

connor_m_chatswood Member

Join Date: Mar 2017
Location: Chatswood NSW
Posts: 86
Car: 1967 W108 250SE (M129)

Hey guys, who rebuilds mechanical fuel injection pumps?

My M130 IP has been showing low output on cylinders 2 and 5 (running rich on the others to compensate). Pulled it out last weekend. Want to send it for a proper rebuild rather then guessing.

Australia or overseas, just want it done properly. Open to suggestions.

18-06-2026, 04:42 PM

patrick_d_lindfield Member

Join Date: May 2019
Location: Lindfield NSW
Posts: 123

Please don't rush in.. before a rebuild, the pump is best tested on a Hartridge bench which will measure the output of each element..

It is even possible to run the engine on 5 cylinders and measure each element's output in turn.

You have reached the conclusion that it needs a rebuild! Are you sure?

18-06-2026, 06:14 PM

tom_s_brisbane Junior Member

Patrick Devine raises the right question.. I had similar symptoms on my 280SE in 2017 and it turned out to be a single seized delivery valve, not a full pump problem. the Hartridge bench at MTQ Engine Systems Lansvale identified it inside 90 minutes and saved me a full rebuild..

18-06-2026, 09:42 PM

rob_s_avalon Member

Jerry Fairchild is the best.

ive had him rebuild 3 injection pumps for me over the years, and would not send them anywhere else.....despite the absurd shipment cost from Australia.

19-06-2026, 09:14 AM

Vasilios_Billy

Lifetime Benzer

Join Date: Mar 2008
Location: Campbelltown NSW
Posts: 1,699
Club: M.A.L.A.K.A.S.
Car: 2020 AMG GT C

Connor - to consolidate Patrick, Tom and Rob's advice:

Step 1: Diagnose before rebuilding. Patrick is exactly right. The M130 PE-type pump has 6 individual delivery valves and 6 plungers. A single failed valve or plunger looks identical to a full pump failure on symptoms alone but is 10% of the cost to fix. Hartridge bench testing at MTQ Engine Systems Lansvale (02 9728 1144) is $240 and you walk out knowing which elements are out of spec.

Step 2: If full rebuild needed, two paths.

Australia - Diesel Injection Specialists Brisbane - they do M130 PE pumps. $1,400 the rebuild, 4-week turnaround. Quality is good, not concours.
USA - Jerry Fairchild as Rob mentioned. Concours-grade rebuild, $1,800 US + shipping both ways (~$600 US total freight). Total $3,650. Best in the world but slow (3-4 months) and expensive.

For a daily-driver W108, Brisbane is the right answer. For a concours-grade restoration, Fairchild is worth the wait. Either way, Hartridge bench test first.

22-06-2026, 04:18 PM

connor_m_chatswood Member

Join Date: Mar 2017
Location: Chatswood NSW
Posts: 86
Car: 1967 W108 250SE (M129)

Patrick, Tom, Rob, Billy - thank you all. Hartridge bench booked at MTQ Lansvale for Wednesday. Will report back. Worst case Brisbane rebuild $1,400. Best case it's one delivery valve. Either way no longer flying blind.

Forum is gold.

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