rayadas

here's the problem, i will be driving at a normal speed(60mph) and all of a sudden my car will start to slow down. when i try giving it more gas, it doesn't go and when the rpm's get low enough it will die. i have a weber intake kit, full racing beat exhaust, a carter fuel pump, and a holley fuel pressure regulator. after the first couple of times it did this, i retuned my car. it was fine for a day, but it did it again. i'm not sure what else to do. the engine is a brand new engine and doesn't even have 5k miles on it. any suggestions would be greatly appreciated, and if u need any more info just ask--thanx

Rogue_Wulff

Sounds like you are having fuel flow issues. Besides the obvious things, such as fuel filter, pump, and lines, you could be having a fuel tank vent issue.
If the vent system is plugged up, it can cause a vacuum to build inside the tank, and the pump will soon be unable to overcome this. A simple way to test for this, loosen the fuel cap, and drive. If the issue does not arise, you have isolated the cause.

Kentetsu

When this happens, what do you have to do in order to get it running again?

rayadas

when it happens i just start the car, hopefully from a stop, but i have started it from a roll. once i start it back up, the problem goes away in a few seconds. i'll give the gas cap a try. i don't know when the next time it might act up, but if it continues i will have to fix it becuase it is pretty annoying. thanx for the help

rayadas

yea, so the problem is still there and this last time i only set the gas cap on the fill neck. i did notice that it acts up more with a full tank. i'm not sure what i should do to fix this problem and i hope that i would be able to fix it with my knowledge so i don't have to take it to a shop. any suggestions would be great, otherwise, i can call my buddy and see what he thinks.--thanx

Kentetsu

How do the plugs look? While you have them out, verify once again that you still have spark...

rayadas

ok, i'll check them out right now--thanx

rayadas

ok, so here's how they look. they are pretty white

rayadas

so do you think i need new plugs and that's the problem, or is it something else?--thanx for the help

bad 83

iTrader: (3)

Holy crap!!! Man that thing is leaning out. It sounds like you are basically running out of fuel. I would check the fuel filter to see if its clogged. If that's not the case, I think you may have a fuel pump going out. The only other thing could be the carb has some kind of blockege.

Atkins Dan

I have had my 82 Supercharged RX7 do the same thing and all it was is a pluged up fuel filter... installed a new filter and it fixed the problem

DAn

rayadas

the only problem is that when i had the new eninge put in, i also had a new fuel filter put on. do u think becuase of the increase in pressure that it picked up a lot of crap to clog it? the engine only has 5k miles on it, along with the weber intake kit. i'm going to take a look at it now and check to see if there is any debris in it. well--thanx for the info.

rayadas

just checked, it was filthy as s***. thanks guys for the help on figuring out my problem. i always have somewhere to go to get help when my knowledge isn't good enough. thanx again.

Kentetsu

The stock filters are junk and not nearly adequate for use in these cars. Here is a thread I did on installing two filters in parallel, which cuts the demand on them in half; https://www.rx7club.com//showthread.php?t=528445 This is not a bad way to improve the performance and lifespan of the system between filter replacement, but there are also a lot of other suggestions (including aftermarket filters) that came into the discussion. Either way you choose to go, I would look into one of these ideas. If your filter was that dirty after that little bit of use, then you probably have a fairly dirty system. The right way to fix this would be to remove/clean/replace everything involved, but since that is such a big project this other option might be worth considering. After all, maybe the system will eventually clean itself out. I'd also run a can of Seafoam through there just for the heck of it. Good luck man.