W123 Performance/Maintenence: Fuel pressure testing, Overflow valve teardown (WK716 and BF7591D)

Gotta have fuel to make power. We test the fuel pressure on our W123 to see if it could be causing any issues.

This tests the Overflow valve and Lift pump (and kinda fuel filters as well)

If there is something restricting the flow like a clogged filter, the overflow valve spring has collapsed, or the lift pump has failed it could drop your power dramatically, or possibly even cause stalling, hard starts or worse!

Not a hard test, and pulling the overflow valve apart isn't rocket science either, Come along as we dig into more of our fueling system.
Key things in video:

0:00 Introduction
1:12 Component locations
2:13 Needed stuff
2:57 Use 17MM wrench to remove outlet fitting from secondary filter
3:07 Stock fitting removed
3:20 Modified banjo fitting
4:05 Prime system to get air out
4:32 Fuel pressure with stock filter
5:30 Healthy pressure.
6:02 Disassembling overflow valve and “repairing”
9:28 reassembling overflow valve
10:38 pressure with BF7591D 2 micron filter
10:58 The one caveat to running a finer filter
11:36 My thoughts on why you want the 2 micron filter
Here are some links to products we used in this video on amazon in case you want to try this, purchasing from these links may earn us a small commission that helps us keep doing videos like this one:

M12x1.5 Tapped Banjo bolt: hhttps://amzn.to/2yRTRkN
1/8 NPT to ¼ Flare fitting for fuel pressure gauge below: https://amzn.to/3a1aSpk
Fuel pressure gauge: https://amzn.to/3e9nwpr

Alternative gauge for possible permanent installation:
Gauge itself: https://amzn.to/2UZmlBI
90 degree Elbow: https://amzn.to/39XZWbS
Use the same M12x1.5 Tapped Banjo bolt: hhttps://amzn.to/2yRTRkN

Things you need to use the gigantic primary "prefilter" that I have:
Filter housing: https://amzn.to/31lon0T
Mesh filter: https://amzn.to/39VP14r
Fittings: https://amzn.to/2XqYBHq
3/8 fuel line: https://amzn.to/3gtDdZy
Clamps for fuel line: https://amzn.to/31mavUd

Видео W123 Performance/Maintenence: Fuel pressure testing, Overflow valve teardown (WK716 and BF7591D) канала trythistv