I have a 83 limited edition and I'm having problems with the car bogging out going up steep hills and after driving for about 10 minutes. I went to the grocery store the other day, no problems, put it at wot n tached it at 8k. No problems. I'm on my way home n start driving up my road n half way up my car starts bogging out, I downshift, still boggs, downshift, bogs..... I had to pull over for a minute n it seems like I had to let fuel pressure build back up. After I waited a minute I was able to drive the rest of the way up the hill to my house. Its been doing the same thing everytime I come up this hill. I took it out the other day n was going the next town up n I was cruising at about 4k n my car started bogging out. I stopped to the side of the road n waited, turned around n went home n ran fine. So I've flushed the gas about a 9 months ago but never put a new fuel filter on n I know the gas was bad. I've replaced the fuel filter now n I can make it all the way to my driveway but its still bogging a little n still does it when I'm driving for about 10 minutes. From what I'm getting out of it, it seems like my engines sucking all the gas out n the fuel pump isn't keeping up with it if this makes sense. I put the new fuel filter on n it seems to not bog out as quick as it was. I can drive for 10 minutes n it still does it though. I think its my fuel pump is goin bad? Any suggestions? It didn't run like this before.

 

If the problem was the fuel pump or the fuel filter, the hill wouldn't make any difference. You would have the problem all the time regardless of the elevation change. Since you had bad gas at one time, and I assume it was due to the car being parked for an extended period of time, your problem is most likely in fuel tank.

What did you find in the fuel filters when you changed them? I suspect your fuel tank is full of rust and in need of cleaning/flushing/resealing.

 

I changed the gas when I got the car febuary of last year when I baught the car. When I emptyed the gas tank it was orange full of rust. I drained all the old gas and put new gas in and the car ran fine for almost a year until just recently. It was bogging out way worse before I put a new fuel filter on (clogged fuel filter holding back fuel pressure?). N when I dumped the gas out of the fuel filter , where gas goes in it dumped out orange but where the gas comes out it was clear so as far as I could see it was still filtering. I don't understand why it bogs out, I sit for about 30 seconds (seems like I need to wait for fuel pressure to build back up) then I can drive up the hill wit no problem. Maybe the fuel pump is still working but it might not be holding constant psi of fuel pressure? Also say I'm in 3rd gear cruising at 3,500 rpm, it runs fine then all of the sudden it starts boggin out. I pull over to the side of the road for 30 seconds n I can drive again. But it will still bog after a while, have to sit n wait some more, then drives fine for a while

 

the fuel pressure is not building fast enough
DONT RUN THE ENGINE ANYMORE!!!!
Step
1. pull the tank down
2. remove the fuel filter and pump. it might be worth it to replace the fuel pump just in case there is rust built up inside it.
3. you should replace the fuel lines now you can try to clean them but i would replace them.
4. ok new fuel lines in old ones out or cleaned

the fuel tank is on the ground now open it up, pour out the gas and inspect the tank use a flashlight to look around if there is rust on the side walls of the tank on the inside i would get a new tank or bring it to a place that will acid wash it and re seal it if it is salvageable.

the problem is you are trying to suck a milkshake through a straw! even with new gas there will still be rust particals fighting at certian points like the pick up tube and fuel filter and fuel pump. dont risk your engine spend the money and fix the problem.

 

the hill would be an issue if the rust particals shift twords the pick up tube

 

Okay thank you, I figured it was my fuel pump going bad and probally clogged fuels lines. I think I'm just going to buy a brand new gas tank, have the fuel lines changed and buy a high pressure performance pump. Also if I buy a higher psi fuel pump, does my car have a fuel pressure regulator or would I have to put one in? I want a good aftermarket fuel pump I can rely on giving me pressure when I need it. Also if I can put a high pressure fuel pump on would I need bigger fuel lines than the stock ones?

 

You will need a FPR. You will also need a high quality, high accuracy gauge like the one that Billy from ReSpeed sells. The Nikki is pretty sensitive to fuel pressure changes, as you're experiencing with this problem, so a good FPR with Billy's 0-10psi gauge (~$70) will do you well.

Or you could just stick with a new stock fuel pump. Your choice.

 

That's the whole point I thought everyone would pick up on. The car dies quicker going up hill because the debris in the tank shifts to the pickup tube, blocking the fuel flow.

You don't need to replace the tank and good luck finding a new one anyway. You can have a radiator shop boil and reseal your tank, I do it on my own tanks after a trip to the radiator shop for boiling. Red-Kote is a good tank sealer. When I refurbish a tank, it get done inside and out. There's always rust spots under the factory under coating.

You DO NOT want a high pressure pump, and there's no need for one. Not only will you need an over priced fuel pressure regulator to control the pressure, you will need to upgrade all the steel fuel lines to larger ones and replace all the rubber lines and clamps with FI rated parts.

Drop the tank, have it cleaned/resealed, replace the old rubber fuel lines while the tank's out, new fuel filter and your done.

 

I've been having similar probs my solution was new clamps /hoses.I think air was getting into system as the clamps were old original and the little hose just before filter from metal tube was cracked at ends so would flex and let air in -checked metal tube for pinholes /pitting and was okay.saved me buying a new fuel pump.

 

Por15.com sells a fuel tank reseal "kit" of chemicals (after you've had it flushed), too.
Great product, used it myself...
You will need at _least_ a new gasket for the fuel level sender unit, BTW...

Stu Aull
80GS
Alaska