I am getting the po87 or something around that code that states check fuel filter. The truck then governs itself to 2000 RPM's. I put a brand new filter on it and I'm still getting the problem. What is the problem that I'm most likely to have?

I am getting the po87 or something around that code that states check fuel filter. The truck then governs itself to 2000 RPM's. I put a brand new filter on it and I'm still getting the problem. What is the problem that I'm most likely to have?

Engine limp mode.

I know its in a limp mode, but what is the cause of it? Weak pump, bad injector?

Does it come back after you remove the code from the computer?

It dosen't come back immediatly. Just when the truck is under a load for a few seconds.

i got the same trouble but just when my PPE its on level 5 ???

My 07 is in at the dealership with that same problem, plus, alot of black smoke.

I am being told by the tech that when the code comes up, the fuel pressure is regulated at exactly 13000lbs. It should be 26000lbs. They ordered a test kit that will check something in the return line.

Jeff

i had the same problem when i didn't use a AC/DELCO fuel filter. they need about 2 bhs or less the after market one, get about 2 or higher if you didn't change it with a AC/DELCO i would change it. i got some cheep one tring to save money but cost me about $350 when took to dealer they said it was the cheep filters replace with AC/DELCO problem solved.

I am getting the po87 or something around that code that states check fuel filter. The truck then governs itself to 2000 RPM's. I put a brand new filter on it and I'm still getting the problem. What is the problem that I'm most likely to have?

Did you try to return to the stock tune and see if that takes care of the codes and the problem? Stock is better than operating at 1/2 power!

I always use a WIX brand fuel filter. On my truck it dosen't matter if the tank is full or empty. I haven't tried putting the stock program back on the truck yet.

when I ran on extreme. I installed a lift pump and no more

I always use a WIX brand fuel filter. On my truck it dosen't matter if the tank is full or empty. I haven't tried putting the stock program back on the truck yet.

i used a wix filter too to save money. then started acting up you might try that first, change back to AC/DELCO first before taking to dealer. they charged me 130 to look at it and 170 to replace it fuel filter.

The wix filter is suppose to be a better filter than the ac delco.

I had that same problem with my 07 lbz put a lift pump on and it fixed the problem

So it looks like a lift pump for me too. Great more money.

First try shimming the FPRV. Then maybe drilling out the rails and also installing the bigger fittings. All of those combined will greatly help you hold commanded rail pressure, and all combined still cost less than a lift pump. Mine holds rail pressure just fine on PPE level 5, no lift pump. The only time I have any problems is if I let the fuel filter go too long(5k+ miles), then I will throw a P0087 at somewhere around 90-110mph after full throttle from right out of the hole.

How hard is it to do all of that? Shimming, drilling rails and bigger fittings.

has anybody got a dealer to tell them what the cause of a code p0087 ''low fuel pressure'' is caused by,bad pump,fpr, or something else???

Tunes such as the Edje J/A hot mode demand more fuel. The p0087 is basically the code that is thrown when the rail pressure drops below the commanded pressure by a certain amount, for a certain amount of time. Basically if the rail pressure is commanded by the ecm to be 26000 psi, and the fuel system can not hold that commanded pressure, it will throw the p0087 code. There is typically no one thing that causes it. On a stock fuel system, the likely weakest link is the FPRV. Shimming/race valve it will eliminate that as a problem. Next weakest links is likely the fittings going into the rails being too small, also the fitting at the fuel pickup in the tank is a restriction. After that, the next weakest link is the stock CP3 pump. This can be helped greatly by adding a lift pump to feed the CP3. Most people can get away with just liftpump(s) to supply their tunes. When you get in the 550+ RWHP range, the factory CP3 can no longer supply enough fuel, and needs to be modded or supplemented with another CP3. Thats my basic knowledge of the system, Im sure others can add to this based on their experiences.has anybody got a dealer to tell them what the cause of a code p0087 ''low fuel pressure'' is caused by,bad pump,fpr, or something else???

Shimming is very easy and costs under ten bucks. I did mine, took maybe an hour tops. Be sure you have a vise handy for the job.

Drilling the rails requires a couple hours of work. Have to remove the rails, to do this some other accessories/wiring needs to be removed. Must be sure to keep entire area clean. Takes a few hours, but I wouldn't recommend this unless you feel confident in what you are doing and have a good clean environment to work in.

Bigger fittings-The ones on the rails aren't too bad. Pain to get to, but simply remove the old, install the new. Never done the fitting in the tank myself, doesn't look too bad though.

All are cheap ways to help your fuel system keep up with a big tune. I have a new fuel filter in my truck right now, and can bury the speedo on my truck from a dead stop without throwing a code, and thats on a pretty big tune, the PPE HOT +2 on level 5(300 hp additional). I am running no lift pump either.How hard is it to do all of that? Shimming, drilling rails and bigger fittings.

my problem is this is happening on a stock engine

How much does a lift pump cost if I need to have that replaced?

these trucks don't have a lift pump,just cp3 ,the fuel sys is a vacume from tank to filter to eng

Lift pumps will go from 250 USD to 450 USD...the combo units (pump / filter / entrained air removal), such as "Aridog II" or "FASS" run in the 600+ range.

On a stock engine with no programmer/"chip" there should be no real need for either..? When you throw the code..is it because you tromp on the pedal all at once instead of rolling into it..??

stk

Sometimes the best thing you can do are the easiest, cheapest and most obvious, which in this case is changing the fuel filter. With the tools that I have (efi live), I personally would do some logging and look at the commanded vs actual rail pressure to see when and where the problem is happening in my tune. I just threw one of these this evening so now its time to do some investigation. I suspect that its a lingering problem with the fprv. I expect to see a dramatic drop off in the actual rail pressure when the fprv blows. If its leaking at all it will impact rail pressure dramatically on big tunes. I will need a "bottle test" to see if it's leaking all the time, which I virtually gurantee is happening. In most cases its probably the filter or something simple, and of course shimming and lift pumps help. I have both in my setup. I wouldnt throw down the money for a lift pump btw without getting a nicktane or secondary filter and air water separator. Good fuel is key to keeping your ride running right and is cheap compared to expensive injection system components.