Question about Ford F-150

1 Answer

F150 oil pump Replacement

My problem starts with the oil pressure. 1994 f-150 4x2 5.0 v8 has over 175k miles on it. Truck has always been in good condition other than minor replacements. Motor tranny all run smooth. Untill a couple of months ago i started to lose oil pressure on the highway so i stoped went home changed the oil and it was fine. The other day happened to me again after it had been driving for 25 minutes or so. When pushed to about 1500 rpms lost all pressure, but let go of gas gained it all back. So i changed sending unit and oil now still does the name thing right when i start it up. So its seems to be the oil pump but i cant figure it out for sure until i get the pan down. The thing is its going to be alot of work for me. Ive done plenty of work on it, had the y pipe off before and replaced a manifold so its all about lifting the motor. Question one is it has over 175 thousand miles so is the engine ruined now that this has happened and is it worth the money considering its history. Question two is should i try doing it or is it worth trusting and paying someone else to do it.

All advice appreciated.


Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Brigadier General:

    An expert that has over 10,000 points.

  • Master
  • 4,669 Answers

If it has oil pressure at idle I would say the pump is good. I would try hooking up a mechanical gauge(oil pressure tester) and drive the truck with this on it to verify the pressure. The funny thing is what you are describing to me sounds like a restricted oil filter.

Posted on Mar 02, 2009


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Why dose my truck my truckturn over but has no oil presure just installed high presher oil pump

No oil pressure after hop replacement .the 6.0l has 2 supply tubes 1 for each head .also each oil rail has a dummy plug.all of which can cause a no oil pressure event.when u installed the hpp their is a fitting on the back of the pump .if that fittings o- ring was not replaced with factory o-ring it will blow out .no pressure .the truck will start if u have pressure.even if gauge is not at this point u have an internal oil leak

Aug 29, 2014 | 2006 Ford F 350 Super Duty

1 Answer

1993 ford f150 oil pressue gadge running low after truck warms up

I would put a oil pressure gage on the truck and verify that the pump is good. The lifters should not rattle unless someone has been adjusting the valve lash. At 196000 miles the lifters maybe getting weak, push rods could be wearing.

Apr 24, 2017 | Ford F-150 Cars & Trucks

1 Answer

Oil pressure gauge starts fluttering after truck is driven 15-20 miles and you pull up at stop light. As soon as you accelerate it stops ? oil pump going bad?

Could be oil pump, also could be sending unit. When did you last change oil, is oil low? If it's been a while try putting in high mileage oil with higher viscosity, 20w50 for example

Aug 19, 2010 | 1990 Ford F150

1 Answer

1997 Toyota T100 - Truck seems harger to start. I have always been able to start the truck with the turn of the key immediately. At first it appears to be only with a hot start, now it appears to be...

Most likely the fuel pump is failing, the fuel pressure check valve is defective and the system loses pressure the long crank is due to this loss of fuel system pressure.

Jun 23, 2017 | 1997 Toyota T100

1 Answer

2002 F150 Temp reads hot and loss of power. The truck is not running hot when temp gauge reads hot and when I shut off truck and restart the gauge goes to normal for about a mile then back to hot. It...

You could try another oil pressure sensor or test the oil pressure with a gauge at the sensor port. If you think about it, the truck goes into a failsafe mode when there is a problem. You could go into failsafe with high temperatures too. The water temp sensor could be bad but with the oil light coming on, the oil sensor should be your first choice.

You can get a free scan at Autozone or Oreillys and it may show the problem. Sometimes it takes a better scan with dealership type diagnostics because the self-diagnostics on your truck is limited.

Failsafe mode would cause the power loss because the truck is designed to kill cylinders and to use the dead cylinders as hot exhaust pumps to cool the block.

Jan 11, 2010 | 2002 Ford F150 Regular Cab

1 Answer

What's the best oil for 97 F150 4.2?

basically depends what climate you are in... 5W30 is pretty good for cold climates... 10W30 usually seems to work best tho

Feb 05, 2009 | 1997 Ford F150 Regular Cab

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

490 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ford Experts


Level 3 Expert

77499 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22306 Answers


Level 3 Expert

5623 Answers

Are you a Ford Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides