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1989 Lincoln Town Car fuel pressure test

I wanted to check the fuel pressure to see if it fell in the normal range. After doing some more research, it looks like it's O.K..

User Comments

WhoSaidTyler commented on 17 Oct 2010

Well it's in spec for the running test, but it's not building pressure quickly enough. With the gauge connected, the pressure should pop up to spec as soon as the key is turned to ON and the pump does it's priming thing(without starting the engine). I would change the filter first(inside frame rail under the right rear door). The thing with the pump not running occasionally is nearly always because it's getting worn out, so this all might be leading down the same path.

compu85 commented on 21 Oct 2010

For a test you can always use a jumper wire to bypass the relay. That also makes it easy to have the pump run for other testing with the engine off. As I said on your other video don't overlook the fuel pressure regulator. It will be a device on the fuel rail with a vacuum line going to it. That pressure does seem low, though I'm not an expert with Fords. VW electronic fuel injection runs about 45 psi. (The old mechanical CIS system was much higher, about 85 psi)

clubcar98 commented on 18 Oct 2010

Id change the fuel filter. The pressure came up slow, it should come right up as soon as they key is on. If you change the filter and it still comes up slowly, id consider a weak pump, or if the pump has a filter screen it could be clogged or getting clogged.

TheTarrMan commented on 17 Oct 2010

I had the same problem with my relay. I gust gave it a good tap to get me home. Judging by how slowly your fuel pressure went up, you might want to replace the fuel filter though. You said you didn't hear the fuel pump, so it probably electrical.

SpiritsoftheWolf commented on 31 Dec 2010

@clubcar98, the normal fuel pump pressure is between 35 to 45 psi, anything less than 33 is considered weak and needs new fuel pump, and on top of that, change fuel filter is also an idea when replacing fuel pump too :)

mjmcomputers commented on 19 Oct 2010

Change the fuel filter and test it again. I've gooten alot of bad parts of the shelf. Autozone seems to be the worst about it, exchange that relay for another and it should be fine.

WhoSaidTyler commented on 17 Oct 2010

@GatheringSticks Well store brand relays and switches are usually junk. Chad would be better served going to a junkyard and getting a used Motorcraft relay.

alberto gorin commented on 17 Oct 2010

i appoldges i can t help you.i would go to the lincoln dealer i am sory.love the sound of the town car.i hope we get update on this problem being solved

TheTarrMan commented on 17 Oct 2010

@jasonsg4111 Yes, Duralast (AutoZone) will if the electrical part is defeated. They even have warranties on most there parts.

gbowne1 commented on 18 Oct 2010

I agree with clubcar98.. replace the filter plus check and or R&R the pump.

GatheringSticks commented on 17 Oct 2010

hope you get it figured...too bad they sold you a dud relay.

78recordrepair commented on 17 Oct 2010

That car sounds like an electrolux vacuum cleaner!

WhoSaidTyler commented on 17 Oct 2010

@Twonky411 the what?

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