FLA_FORD

1995 F150 4.9 straight six 4x4 / 5 speed manual. prior to fuel pump install hesitates on acceleration in all gears. hedges and sputters while trying to maintain cruise speed. usually happened shortly after warm up. have installed new plugs, plug wires, distributor cap and rotor button. the guy who installed the pump refused to apply diagnostics prior to installation. Will start with starting fluid shot into air-intake but stops running shortly after. thinking I need to check fuel pressure if any, ignition module? need help. Thanks.

Lazarus-F150

Does it seem to run well before its warm?

5Rangers

If the engine starts with fluid then you have fire, no fuel. Which rules out ignition. You will need to do a fuel pressure test. You should also hear the pump run to prime the system when you turn the key on.

FLA_FORD

Yes - maybe a mile down the road.

FLA_FORD

Could the ignition module still need replaced if I have spark? Should I do a spark test to determine spark value. The guy who installed the pump says I need that part.

Thanks for your response.

5Rangers

Look... its possible you could have an intermittent ignition module. But why did the mechanic replace the fuel pump if the module is bad? Sounds like they are trying to soak you for cash. Get you pressure readings on the pump if they are good we can go down the road of checking the module.

FLA_FORD

I am a damn good carpenter, yet I am not very good on mechanical truck issues. I agree that he was more interested in changing out the pump. The weather in NW Pa. on Christmas day was 19 degrees and blowing snow. I was desperate to get my truck on the road and he was desperate to make the most money. I asked him to do some diagnostic procedures, and asked why he did not bring a fuel pressure gauge since he was going to install a fuel pump. He said that because of what I described to him as symptoms all pointed to a fuel pump problem. He didn't even install the new fuel filter I had brought with me.

Thanks for your reply

5Rangers

Understood... consider changing the filter. It could be clogged beyond reason and the source of the issue.

Also..I didn't understand the mile down the road reference. What did it mean? I ask because I think what Lazarus was after is the ignition module which is mounted to the distributor is subject to failure due to heat. There should be a coating of heatsink compound between them.

The point is if your engine is running fine until it warms up then were could look there.

Fault codes and fuel pressure are basic starting points.

FLA_FORD

I was responding to an earlier post as to when it began to run rough. just talked to the pump guy and he said that the ignition module has something to do with powering the fuel pump. I'm going to the parts store now to pick one up.

Lazarus-F150

Agreed. I changed my fuel filter recently (also shortly before replacing the fuel tank/pump/sender/hanger) and the back flow that came out of it was about the color of a cup of coffee.....

Swapping out the fuel filter will be a breeze, just make sure that you have/get a good disconnect tool. Something along these lines:

http://www.oreillyauto.com/site/c/de...ine+disconnect

As a tip, when you are dealing with Ford quick disconnect fittings.....make sure that you push the line and the filter together a little before fully inserting your tool, then pull them apart.

Also, have you checked for codes?