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Sounds a little similar to my problem with OPS's. Check out my Got Slimed thread. I'm in the process of buying Leroy's OPS relay myself.

The NAPA Echlin OPS have out today. Still ran the oil pressure gauge fine but wouldn't give me positive fuel pressure when not on the throttle. In went the paper clip jumper on the OPS connector and positive pressure came back. Just waiting on my AC Delco OPS to arrive... Hopefully NAPA...

Dual gauges? Interesting! Who makes them? Been looking on the internet but can't find anything.

I actually have 6 gauges I'd like mounted and want to do it in the most tasteful manner. How would you tackle this: 2x fuel level gauges (WVO tanks x2) Fuel pressure Boost Pyrometer Tranny temp Triple pillar pod with a triple over head?

Do quad gauge pillar pods exist for a 94 pickup? I'd like to consolidate a fuel pressure gauge, boost gauge, pyrometer and tranny temp into one location. What is your guys'setup when you have more than 3 gauges?

What are the benefits of an MRFSU?

Damn auto correct!

Who is an MRFSU?

I like recapping what's been done. More for myself as I reflect on what has happened and hopefully it is useful to someone in the future. Thanks again everyone!

It's official, I had another faulty OPS from SSD. The new NAPA Echlin brand did the job and kept my lift pump running with positive fuel pressure even after just now returning from a ~60 mile trip to fix up our rental property. Thanks everyone for all of the pointers and comments. Highlights...

Just replaced the SSD brand OPS with a NAPA Echlin brand. Fingers crossed!

I do have your OPS extension hose

I don't see how this OPS hose grounds anywhere. If I have an OPS connected, that's the only connection I have. Do you have a pic of this ground? When I connect the OPS to its plug, my oil pressure guage works so is it self grounding?

Yes my WVO system has a purge function it's the golden fuel system from goldenfuelsystems.com. I've been running it for the last 4-5 years.

Yes, my OPS connector looks like toast. About 2 OPS's ago (~4 years ago) I had replaced the OPS with an SSD replacement as a prevention but it melted down which is how I got a replacement from SSD which now 4 years later, I have on the end of the OPS extension tube.

Been driving around with the OPS connector jumped with no problems in fuel pressure. I was able to pass up the oreillys and the fuel station I visited last night and got to NAPA. they had no brocade but I did manage to pick up a new eichlin OPS. I'll try it out later after work. Leroy...

I wouldn't rule that out.... Well did more driving and the fluctuating of the fuel pressure appeared again. No more stalling but I did notice that my fuel pressure would drop when I hit the brakes to stop (electrical issue?) So, I jumped the OPS connector again and so far no more drastic drops...

So, did more investigating since Internet services are spotty in the office today. Turns out I didn't get the fuel filter on tight enough. I'm at the range now checking on my Marines and didn't have to jumper the OPS connector to get here (about 2 miles from the office). Positive fuel pressure...

I do have a WVO system that is separate from the diesel tank underneath. It runs on valves which allows me to choose between the wvo system or the diesel tank system.

Well, decided to jump the OPS connector on my short drive to work which is only really less than a mile away from the house. When I backed in to my parking spot, I noticed a trail of fuel. So, something must have gotten loose around the FFM area or I may not have installed the new fuel...