relentless85

A few months ago I replaced my fuel pump with a new AC Delco fuel pump in my 2005 Silverado 5.3. I replaced the fuel pump because I was having the symptom of turning the key and the engine not starting on the first try. I had to "prime" the system by turning the key a few times then the engine would start like "normal". After replacing the fuel pump, the engine now starts on the first crank but I am getting a hesitation on only the first start up after the engine has been sitting overnight. If i were to shut the engine off immediately after the first start, I could crank the engine over again and it would start with no hesitation. I connected a mechanical fuel gauge to the port on the passenger side of the engine and here are the results: - Key on engine off 64 PSI then slowly drops. - Engine on at idle steady 64 PSI - Engine off right after idle drops to 58 PSI -Engine off key off for after 2 hours drops to 30 PSI - Engine off key off overnight 18 PSI The MAF and Throttle Body has been cleaned with CRC cleaner. Last night i went trough and sprayed carb cleaner on the vacuum hoses I could see and I did not get a fluctuation in idle, so i don't think I have any vacuum leaks. Since my truck is an 05, I don't believe it has a fuel pressure regulator or an idle air control valve. The coolant temp sensor in the driver side of the block has been replaced too, I need to OHM that out to verify it is working correctly. My question is: A) What else do I need to be looking for that will cause the hesitation only on the first start up? Is there a way to test the MAF or throttle body with a multimeter? B) is the fuel pressure supposed to bleed off like that, or is it supposed to hold the higher pressure all of the time? Or am I worrying about nothing with the fuel pressure bleeding off?

No, I did not replace that gasket or take off that plate.

Well I went through the process of replacing the oil pump with a melling M295HV pump. Now this is what I’m getting with a mechanical oil pump connected to a port just above the oil filter......After melling M295HV install if you watch the video. The gauge needle flutter and fluctuates rapidly at idle and at higher rpms. Crank case is full with 6 quarts of oil. New wix oil filter. Engine was primed before starting by holding the gas pedal down and cranking engine 5–10 seconds at a time until I saw oil pressure at the mechanical gauge. new oil pump, new pickup tube and o ring. New timing chain. i am puzzled. I don’t think this is normal?

The engine has 146k miles on it. If I need to replace the oil pump, I was considering the Melling M295HV pump.

I have been concerened with the oil pressure reading on the dash gauge since about a few weeks ago. Short story is, i was driving on the highway, noticed a shuttering sound then a tick and tapping sound coming from the engine. I pulled over, the engine was full of oil but i noticed the oil gauge on the dash was reading low. Normally it reads 40+ all of the time. It was lower than 40 almost to 20 PSI. I connected a mechanical oil gauge to the engine and here are the results: At cold start the mechanical gauge reads 44-45 PSI then after about 1:30 goes down to 41 PSI at idle. Here is a video of cold start to idle: https://youtu.be/VeBDv-LvV28 After the engine is up to operating temp and has been running for 15-20 minutes, the mechanical gauge reads 28 PSI and the gauge on the instrument panel reads in between 20-25 PSI at idle. Here is a video of the engine warmed up and running for about 15-20 mins https://youtu.be/PVsrAZWBZNM Then I turned on the Air Conditioner. When the compressor came on the mechanical gauge started fluctuating as well as the instrument panel gauge. The panel gauge read a little below 20 and the mechanical gauge fluctuated between 25-28 PSI. When i turned the AC off, the mechanical gauge did not fluctuate any longer. Here is a video after the AC was turned on: https://youtu.be/Hsy2moas7ko The parts that have been replaced so far are: New oil pick up tube New oil pick up tube 0-ring New oil pressure sensor Using Mobil-1 5W-30 and a Wix oil filter. By watching these videos, would you say i need a new oil pump?

Today I removed the oil pan on my 05 Silverado 5.3L to replace the oil pick up tube o-ring. When I was cleaning out the stock oil pan, I noticed a bunch of cracks in the inside of the pan. The cracks are located around there the 2 long 10MM bolts go up through the bottom of the pan. The cracks don’t appear to go all the way through but I can’t judge how deep the spider cracks really are. Attached are some pictures of the cracks. Is this strange for a stock OEM oil pan to have this? Or was it just part of the casting when they were made? I ordered another oil pan just incase. However I ordered a non OEM oil pan, I hope it fits and functions just as the stock one.

I have a tonno pro folding vinyl tonneau cover on my 05 Silverado. I am looking for recommendations for a good spray to UV protect and clean the vinyl on the tonneau cover.. The tonneau cover came with some spray protectant that is made by the company that makes the tonneau cover, but apparently I can't buy it. I live in Oklahoma so the sun will beat it up pretty bad if i don't have a good protectant on it. Also it gets dusty very easily, so I will get cleaned fairly often. What brand of protectant do you use on your tonneau cover or vinyl on your boat to protect it...if boat products would work on automotive vinyl?