No fuel pump pressure/bad wiring

Asked by Feb 27, 2016 at 09:43 AM about the 1988 Ford Mustang GT

Question type: Maintenance & Repair

Just bought a 1988 Foxbody Mustang GT,
8.0 and it was sitting for about three years
before I bought it. It has bad wiring, just put
in two new plugs, worked the old gas out,
and the battery keeps a good charge. It
seems to have a vacuum leak but it doesn't
seem to have even 5 lbs of pressure in the
fuel pump system. This causes it to shift
and jump. Is my problem a vacuum leak or
something else?

1 Answer

90,705

You showed a 8 liter motor, is this some kind of custom job? 5 lbs of fuel pressure will not feed a 8 liter motor for long, Might work for an idle but that's it. Get the wiring fixed first, you could be loosing voltage the pumps and who knows what else. Then tackle the vacuum leaks.

Your Answer

Add photo

Related Questions

  • fuel pumps 1 answer

    I've been told that there are 2 fuel pumps on this model. One in tank and one in line...somewhere. I have the 5.0 with CFI, automatic. Where is the second pump located at? Also, why would the wire lea...

    1985 Ford Mustang

    -

    Maintenance & Repair

  • Fuel pump

    Im replacing my pigtail for my fuel pump I spliced it all the wires match perfect I noticed it had a plan silver wire that's leading down the honest but it has no where to attach on the pig tail i...

    2008 Ford Mustang V6 Premium

    -

    Maintenance & Repair

  • 93 mustang 2.3L No Start/Pump not priming 1 answer

    My 93 mustang fuel pump turns on half of the time. I recently took it to a mechanic and he says theres 3 shorts. Ive checked with a multi meter there are no breaks in the wires. My inertia switch...

    1993 Ford Mustang LX Hatchback

    -

    Maintenance & Repair

  • Fuel issuez 3 answers

    Replaced a bad pump and now it turns over for days but refuses to start and run. If I spray starting fluid it fires up then dies. I've changed the fuel filter and plugs. I have a ram air intake. It...

    2000 Ford Mustang Base

    -

    Maintenance & Repair

  • Is it the Fuel Filter, Fuel Pump or Wiring? 9 answers

    My 1992 T-Bird, was doing really good until I got it smog, had an o2 sensor replace and an egr sensor. Went to a Valero gas station then it started running horribly, jerking, missing, I burned out the...

    Ford Thunderbird

    -

    Maintenance & Repair

Search Ford Mustang Questions

Ford Mustang Experts

#1 Tom Demyan
Tom Demyan
Reputation 4,140
#2 Bob Beaman
Bob Beaman
Reputation 1,200
#3 COMETGUY61
COMETGUY61
Reputation 1,030
View All

Related Models For Sale

Used Chevrolet Camaro
154 Great Deals out of 32,676 listings starting at $1,995
Used Dodge Charger
282 Great Deals out of 26,749 listings starting at $2,250
Used Chevrolet Corvette
95 Great Deals out of 20,203 listings starting at $3,495
Used Ford F-150
2,208 Great Deals out of 208,724 listings starting at $1,499
Used BMW 3 Series
969 Great Deals out of 33,360 listings starting at $1,000
Used Jeep Wrangler
272 Great Deals out of 18,507 listings starting at $2,995
Used Honda Civic
492 Great Deals out of 87,973 listings starting at $1,499
Used BMW M3
39 Great Deals out of 1,709 listings starting at $4,544

Used Cars For Sale

2017 Ford Mustang GT For Sale
4 Great Deals out of 4,825 listings starting at $25,930
2016 Ford Mustang GT For Sale
536 listings starting at $24,888
2015 Ford Mustang GT For Sale
5 Great Deals out of 497 listings starting at $23,995
2014 Ford Mustang GT For Sale
3 Great Deals out of 441 listings starting at $16,995