Truck is a 351 Windsor v8...H.O. ...HAS the mechanical fuel pump which I have changed out twice....Seems like the carburetor isn't getting fuel. Is there a fuel pump relay?
There is probably a filter screen where the gas comes into the carb. Remove the gas line and the nut it screws into on the carb to find the screen.
Duane
The inlet line to the carb has a screen filter, but the float needle often had a rubber tip. The new fuel has alchohol and that dissolves rubber. Your needle valve can be stuck and blocking the fuel from entering the carburetor. Also, there is a difference in gasket material for new versus old fuel. The old style black gasket material will swell and block the carburetor passages. The newer gasket material is sometimes blue in color. This gasket material is compatible with gasohol.
There is also a part in the front of some Holley carbs called a "power valve" or "accelerator pump". It is a rubber diaphram inside a chamber with 4 screws and mounted to a rod or lever directly attached to the accelerator connector plate.
there is a power valve. I was wondering what it does. It almost looks like a button.
Now suddenly when i remove the fuel line from the carb...then crank it over to see if fuel squirts from the line...i get NOTHING. Now i am real confused. lol. Can the crank shaft be broke causing my problem? Should i do something with the accelerator pump? I am at a loss.
Can this valve you mentioned be the issue?If so, what can i do?Like i said, it looks like a hard rubber type button on the front of the carb.
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If you have a mechanical pump, there should not be a fuel relay. But they did use an ignition relay in the early days of Electronic ignition.
There is a chance that you installed the fuel pump and missed the camshaft operating lobe. The lobe pushes the fuel pump arm up and down.
But if the timing chain broke, the camshaft lobe would not be turning to operate the fuel pump lever. You should lift off the distributor cap and see if the rotor turns when the engine cranks over.
Sometimes a mechanic would measure fuel pump efficiency by putting a rubber hose onto a fitting and substituting this tester in place of the original carburetor line.
Also check the fuel filter under the vehicle. There may have been no problem with any pump, just a clogged fuel filter.
that fixed the pump issue...i appreciate it. I just didnt have the arm in the right place. However, it still acts like the carb. is not getting fuel. Cranks over, but no fuel evidently. I tested the pump...its pumping between the tank and pump..Maybe the carb. is clogged or messed up?Should be gas going to carb.
Could the fuel filter be clogged up at the carb? Thats the only thing i can think of.
I pour gas directly into the carb...to prime it...it runs for a second or 2 then quits...
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SOURCE: truck starts, dies. truck runs good some days,bad the next
I had the same problem with My 1990 F150 300 6cylinder 4x4.....I cahnged all the same things you did, finally I sprayed a can of Gumout through the throttle body and it worked and ran great. Now I add fuel injector cleaner to the gas and a regular clean with the gumout and the problem has'nt come back. Good Luck to you and hope it works!
SOURCE: 1991 ford f150 no noise from fuel pump and truck will not start
get a code reader like the Actron CP9015 Code Scanner, 20 dollars and will flash codes. if it will not diagnose itself, the ecm must be replaced. this fixed my dads truck with the same problem
SOURCE: the truck died,it will fire
CAN THE FUEL INJECTORS FROM A 8 CYLINDER 1990 FORD F150 TO A 6 CYLINDER 1990 F 150
SOURCE: 1991 ford f-150 fuel pump will not come on
remember the switch only gets power for 1 second when u turn the key on, the common problem is the ignition starter switch comes apart, it is located at top of the steering column near the bottom, drop the column down (2 nuts) and inspect the switch for separation.
SOURCE: i am not getting power to my fuel pump
on a lot of ford products there is a switch that goes from the fuel pump to the inside of one of the bedsides.
what this is, is a shock switch that turns the fuel pump off if it absorbs a hit.
its a really dumb safety feature but its effective.
there is a red button on it that u have to press to make it active again.
sometimes they just trip for no reason.
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