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OT Olds fuel pump,sorry for the long letter

B

Bspauld

Member
My grandsons 91 "88" acts like it runs out of gas when you come to a stop,if the tank is under half full, but if you keep the throttle down just at a fast idle it stays running.Now it trys to die at over a half a tank, We took the gas line off at the filter and a lot of gas comes out,my pressure gauge dont work right but it has a lot of pressure,Can a fuel pump go half way bad? It looks like quite a job to chnage it the regular way so have given throught to cutting a hole in the trunk tog et to it? any ideas ? Thabnks in advance
 
There may be what seems like a lot of pressure but is there enough volume. Way back when I had a '88 Ford Tempo and when the fuel pump died it was exactly like you describe. If I kept the throttle below 1/2 it would run, although it was rough it did run. Anything over 1/2 and nothing, it would sputter and die. On that car I dropped the tank because I had no other choice. I was away from home visiting my brother and he didn't have a garage so I did it in his driveway.

Edit: I read the problem wrong..........what the other guys are saying. I had something similar, stalling at idle and I believe it was the EGR valve or maybe a sensor.
 
You probably need to be looking somewhere besides the fuel pump. I would begin with the EGR valve. It can stick open and cause idle problems, especially when it's warm. A good way to check it is to take it off and turn it upside down then plut a small amount of liquid in at the pintle. It should hold all the liquid without leaking. I have cut out a pop can to fit the base and used it block off leaking EGR valves. The "Check Engine" light will probably come on if you this, but it will eliminate a leaking EGR as your problem.
You would also do well to clean out the bore of the throttle body, especially the back side of the butterfly. Spray some carb & choke cleaner back in there, and take a rag and wipe it clean. HTH
Good Luck and God Bless
 
Hey Pard,

Like the other feller said, that's not a fuel problem, it's an engine management issue.

EGR system, dirty throttle body/plate or mass air flow would be my guess.

The worst trouble shoot I've ever ran into was doing the same darned thing. Come to find out, someone, somewhere had installed the wrong PROM/ECM trying to cure another problem and had created havok with the curb idle.

Allan
 
Just on a whim, get a multimeter and check voltage with the engine at low idle and with an extra few hundred rpm to make the alternator kick in. If the low idle voltage is under 12.5 you will have trouble with an electronic engine control system.

The clerk at the car parts store wanted to sell me an alternator but it was the battery on my Jeep.
 
You need a fuel pressure guage that you can see while driving. Confirm what the fuel is doing.

Usually when this happens the connector hose in the tank has a small hole in it and when stopping the fuel level goes below the hose and the fuel pressure drops just enough to cause the problem. Another thing that happens is the retainer in the tank that holds the fuel around the fuel pump has come loose. However, when the retainer is loose the problem won't show itself until down around 1/4 tank.
 
Are you getting a check engine lite? Watch your fuel pressure gauge when accelerating to see if the pressure drops. If it does the fuel pump may have blockage at the pickup tube. You would need to drop the gas tank to get to the pump. Hal
 
We unhooked the EGR valve and it dont act like its running out of gas now but under acceration it misses some,is that normal with it unhooked?
 
Lots of pressure how much , 20 lbs , 30 , 42-44 ? only one right answer . If you don't have EXACT fuel pressure you are chasing your tail on drivability problems . Also , Fuel volume ! Any work been done to car? Plugs , fuel filter , plug wires .
 
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