High pressure fuel pump is to high

[bluecollerboater]

I have a volvo 5.7 gipmda. I have a couple of issues, the high pressure fuel pump is putting out 18 psi. It should be putting out a max of 13 psi. I ha e disconnected the feed to the tbi and blown through it and disconnect the return line to the fuel reservoir and blown through it so I know there are no restrictions there. What else might make the pressure high? Also I can not get the timing closer than 20 degrees advanced without stalling the engine. Could these two issues be related and what should I check? Thanks in advance.

 

[Don S]

Re: High pressure fuel pump is to high

I gave you a .pdf file on troubleshooting in your other thread.

http://forums.iboats.com/volvo-pent...vacuum-test-5-7gipmda-611089.html#post4259642

Yes all your problems could be related. Get one thing fixed at a time, and since you can't adjust the timing, might as well fix the fuel system and see if you can then adjust the timing.
I really think you need more than just the code tool on your engine. There are things that could be wrong that aren't setting a code that is really hurting things.

HERE is a link to the manual. It's going to be confusing to follow, but it's going to be a lot easier in the long run for me to just give you some page numbers than to make a bunch of different small files.

 

[Don S]

Re: High pressure fuel pump is to high

So, what happened? Did you find the problem? give up? sell it as a planter, or what?????

 

[bluecollerboater]

Re: High pressure fuel pump is to high

Sorry. Still in the works. Figured out I was reading the fuel pressure wrong it is in spec. I did a vacuum test and at 1000 rpm everything checked out about 20. There was a small flutter about 2 inches, which I believe is timing. And the spark plugs are dry sooted which I also think is timing. I am going to do a compression test in about an hour. I will let you know how that turns out. I have a appointment on July 7 th at a local volvo penta shop if all else fails. I will post back as soon as the compression test is done.

 

[Don S]

Re: High pressure fuel pump is to high

You keep asking individual things, like how the starter works, how to set the timing, questions about fuel pump pressure.

What exactly is your main problem?

 

[bluecollerboater]

Re: High pressure fuel pump is to high

ok. my main problem is i have low compression in 2 cylinders. here is the deal. I have 170 psi in all but 2 cylinders. they are not on the same side, so head gaskets are ok. the 2 i have a problem with are 3 and 4. they are the 2nd cylinders back on either side. the #3 on port side is 130psi and the #4 on starboard side is 100 psi. when i saw the first one low i thought it might be a sticky valve. then when i found the 2nd one low exactly opposite i am wondering if there is an intake gasket blown or something else. it seems weird the 2nd cylinder back on both sides are low.

 

[bluecollerboater]

Re: High pressure fuel pump is to high

also i took the valve cover off the port side and the valves on #3 cylinder seem to be moving. at least the pushrods and springs. I did notice the rocker arm on the valve towards the rear of the engine on the #3 cylinder seemed a little slower. at least by eye.

 

[Don S]

Re: High pressure fuel pump is to high

I was trying to find out what kind of running problem you are having. Doesn't make sense to check fuel pump pressure and set timing when you have bad compression.

Until you get the compression fixed in those two cylinders, whatever your problem is exactly, it's not going to run right.

Lot's of things can cause low compression, have you done a leak down test to determine what is causing the problem?

Here shows how the cylinders are numbered on a SBC V8.

 

[bluecollerboater]

Re: High pressure fuel pump is to high

No. I have not done a leak down test. I will look up how to do it online tonight and do it tomorrow and let you know the results.

 

[bluecollerboater]

Re: High pressure fuel pump is to high

I thought I could do a leak down test with a compression tester. I was wrong. I do not have a leak down tester. Best case scenario is the heads are going to have to come off anyway. Correct?

 

[Don S]

Re: High pressure fuel pump is to high

Just pulling the heads off won't help if you can't see the problem.

You don't need to do a full leakdown test, what you are trying to determine is where the compression is going. For that you can use the compression tester hose. Just remove the needle valve in the end of the hose if it has one. Then plug compressed air into onto the hose.

You are trying to HEAR where the leak is. If most of the air is going around the rings you will hear the sound loudest out of the valve covers, intake valve the sound would be from the throttle body, if exhaust valve the exhaust.

 

[bluecollerboater]

Re: High pressure fuel pump is to high

I am not going to remove the head until I know where the problem is. I will remove the needle valve from my compression tester and put some air into each of the 2 cylinders to see where the problem is. Might get to it either today or tomorrow. I will let you know how it works out.

 

[bluecollerboater]

Re: High pressure fuel pump is to high

Ok. Here is an update. I took the needle out om my compression tester and added air to the 2 cylinders that were giving me low compression first the number 3 on the port side and it seemed like air was coming out of the valve cover, worn rings. Then the number 4 on the starboard side and the air was coming out of the throttle body, stuck intake valve. So I have taken a quart of oil out of my engine and replaced it with a quart of ATF, to try and clean things up a little. I did not expect much but my number 3 cylinder compression has come up to 155 psi and number 4 on the starboard has come up to 120 psi. Number 3 will come up to 165 with a teaspoon of oil, so I am assuming the rings are a little worn. The one I am worried about is the number 4. I have taken off the valve cover and hit it with pb blaster and sea foam deep creep. I will continue to spray it everyday for a week and see if it helps. I know you can burn a exhaust valve what do you think is wrong with the intake valve? The boat. Had been sitting for three years before I bought it. Could this just be rusted in place?

 

[Don S]

Re: High pressure fuel pump is to high

The one I am worried about is the number 4. I have taken off the valve cover and hit it with pb blaster and sea foam deep creep.

That is not going to fix a burned, or warped valve, and you have a ring problem on the other one possibly from rust.
That squirt of oil isn't going to fix anything. It was just a test to find out if sealing the rings will bring the compression up.
You need engine work, and it's not going to run right with that kind of compression.

 

[bluecollerboater]

Re: High pressure fuel pump is to high

Ok. Thank you.