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Hi all, i have a Merc 5.7 EFI. Recently i have noticed a high pitched noise coming from the engine while it's running. Seems to be more pronounced when the engine is warm vs when it's cold. It doesn't seem to change with change in RPM, it's just a constant high pitched humming sound. I have...

Appreciate all the thoughts and ideas. I went around and tightened up all the hoses coming off the radiator and then gave it an hour of use. After letting it sit, there were no visible signs of leaking like in the photos i posted. So i'm hoping it was as simple as that. The manifolds, risers and...

Thanks everyone, much appreciated.

Hi all. Engine is a merc 5.7 efi with closed cooling. I've noticed a bit of the green antifreeze dripping into the bilge lately so i started to look around closer. On the port side i noticed a few drips on the boot of the spark plug. Using my camera i can see a small puddle of the AF on the...

UPDATE Got the heads taken apart and the intake valve on the bad cylinder is tuliped. I'm sure this is what has led to all the smokey, fuel slick issues.

Thanks. I'm not sure if that is something i want to tackle or not. I need to do some research and decide what to do.

Having some issues with shipping on that fuel gauge, so in the meantime i decided to check my compression again (i did this a year and a half ago and it checked out fine). Well, i found my issue. Cylinder #4 has 0 compression. I didn't have any oil on me to try a wet test but the needle never...

Thanks @scoflaw I have purchased this one https://www.amazon.com/gp/product/B0009XQUKC/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1 after some research and from everything i have read, it should work on my system. However, thats what i thought about the first one i bought, which didn't...

This is what i've gone off of when looking for parts on the BAM website

@ttmott Thanks for those links. I purchased a similar branded fuel pressure gauge as that one but the adapters didn't fit securely, there was too much wiggle (even with washers inserted) for me to feel comfortable priming the fuel pump. I have another one in delivery that i'm hoping will work. I...

Thanks @scoflaw I will definitely check the pressure first, i bought the FPR early to save time and i'll return it if needed.

@ttmott My system has the fuel cooler with the FPR mounted to it. Based on the symptoms of my engine i'm assuming i have high fuel pressure and that's why i'm looking into this. I have also purchased a new FPR just in case (and as someone else mentioned on here, wouldn't be a bad idea to replace...

@ttmott Appreciate the post and thoughts, especially the safety tips. Once i can find a pressure gauge with adapters that fit i will certainly take your advice. I do have one question regarding the vacuum and how the FPR works (in my boat). I have done lots of research on how the FPR works and...

Thanks for the replies. I'm leaning more towards only removing the plastic cover. The boat is in the water and i don't want to be removing water lines and the entire assembly, since all i need access to is the FPR. The outside cover appears to be unlatched already as it is loose and wiggles...

While i'm still searching for the correct adapters i need to check the fuel pressure, i began to take a look at the fuel cooler housing where the FPR is located. Does anyone here have experience taking off the housing around the fuel cooler/pump/FPR? There appears to be a bracket with a plastic...

I replaced the temp sensor a couple years ago as my first attempt to fix this issue. I will look into replacing the pressure regulator. Just wish it was a bit easier to get to

Update: I purchased the pressure gauge kit referenced by @techmitch above because it mentions connections to a GM TBI. I removed the fuel line from the TB unit and connected an adapter from the kit into the TB side. It seemed to have a nice tight connection with no wiggle. When connecting the...

After some more reading and video searching, i found a video of the same engine and fuel system (TBI), and the mechanics were checking it for some fuel issues. They pulled the Fuel Pressure sensor that screws into the TB unit and put their fuel pressure gauge into that hole to check for...

Thanks @Nater Potater Regarding the second question, i have seen a youtube video of what you are describing and shouldn't have any issues doing that. When i get some time to go to the boat, i will do this as step 1 and then get some things ordered. I have been doing some reading about causes...

I'll need to inspect my fuel line and throttle body inlet to see if the adapter @Espos4 linked will work A couple early questions i have are: Is this adapter something i will leave in place, or only put on when i need to check the pressure? With the engine off, can i safely...