Now I am trying to build my own fuel pressure gauge. I have the gauge,
plenty of them, but I need to adapt the Schrader valve on the fuel rail to
1/4" NPT or 1/8" NPT. I called a bunch of automotive shops, a/c part
suppliers, fluid power suppliers, etc. etc. No one can find this thing for
me, and half the people don't know what it is I am talking about.
Once again, old retired electrical guy; take my thoughts
with a grain of salt... but somewhat plagiarized...
Check the fuel line from the tank to the pressure regulator,
looking for pinched or "improperly sharp bends" in it...
Obvious, I guess - but also look for leaks.
Check the vac hose that feeds the regulator thoroughly,
and it's source. Disconnect it (engine running) and
verify there's vac.
If you have or can borrow a hand pump, suck the pressure
regulator down to 10 or 12 inches. See if engine runs
better. See if the vac will hold for at least several
minutes without leaking down.
And yikes! Last resort, check for a leaking injector
in one of the other cylinders.
All of this relative to "low fuel pressure"
And if that fails - dunno where you are other than
Eastern Canada (I'm Winnipeg), but suspect it might
be easier/faster/cheaper to let a mechanic who has
one just check the pressure for you. Not fix it, just
check the pressure. Buy him lunch :)
I'm real lucky; have a little tiny used car lot at the
corner. Owned by a licensed mechanic. Fantastic
neighbor. Works two ways I guess, went for a bike
ride last summer, rode through his lot. Sat evening,
threatening to rain heavy, and found an almost new
Park avenue with the sunroof wide open. Couldn't
close it, but phoned him at home.
Good luck, and take care.
As aarc... said: R-12 low side fitting is same as gm port injection
large Shrader. Get a R-12 low side hose with female R-12 1/4" Schrader
to 1/4" anything else (flare, NPT, etc.) and either use the other end
or cut it off and use a hose barb.
I suppose you could install an R-134 quick connect fitting on your
car and use a R-134 hose. Get one that has a core and permanently
remove the old core.
I made the following post back on Oct. 4, 2004. Sounds like we are having
the same trouble. I rarely drive the car but was looking at buying a fuel
pressure tester from NAPA for about $45.00. Let me know what you find out
94 Pontiac SSEi.
The car is showing a miss on the #5 cylinder, occurs only when engine is
under boost from the supercharger. Occasionally also shows miss on #4 and
less frequently on #6. This was found by using a scan tool.
Have swapped plugs, wires, injectors, injector wires, and coils with those
from either #3 or #1 cylinder, but problem stays on #5. Also tried a new
ignition control module. Engine runs smooth in the driveway at all rpms.
Only misses under load and only under boost conditions.
I'm thinking fuel pressure regulator?? fuel pump??
The fuel filter was recently replaced. I run 92/93 octane.
Problem occured after car was parked for several months with only being
started every couple of weeks and idling to operating temp. The car has
177,000 miles. Ran great before parking it.
Any help would be greatly appreciated.
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.